El PIC 18F452

Arquitectura

Registre	Funció	Detalls
WREG	working register
INTCON	control d'interrupcions	0=disabled, 1 = enabled (see INTCON)
T1CON	control del timer 1	load preset value (?)
TMR1H&L		(?)
WDTCON	watch dog control	(?)
PORTB	reads the pin levels / write to the port latch	input/output
LATB	output latch	output
TRISB	data direction	1=input, 0=output

Each port has three registers for its operation. These registers are:

TRIS register (data direction register)
PORT register (reads the levels on the pins of the device)
LAT register (output latch)
The data latch (LAT register) is useful for read-modifywrite operations on the value that the I/O pins are driving.

Reading the PORTx register reads the status of the pins, whereas writing to it will write to the port latch.

PORTA is a 7-bit wide, bi-directional port.
PORTB is an 8-bit wide, bi-directional port.
PORTC is an 8-bit wide, bi-directional port.
PORTD is an 8-bit wide, bi-directional port.
PORTE is a 3-bit wide, bi-directional port.

Features

Operating frequency	DC-40 MHz
Program memory (bytes)	32 K (0..0x7FFF)
Data memory (bytes)	1536 (0..0x5FF)
Data EEPROM memory (bytes)	256
I/O ports	A thru E (5)
Timers	4
10-bit AtoD module	8 input channels
Instruction set	75 instructions

Registers - program counter (PCL), STATUS, working (WREG), bank select register (BSR), mapped ports (TRISx), interrupt control (INTCON), file select (FSR#), special function (SFR).

Memory organization

The Special Function Registers (SFRs) are registers used by the CPU and Peripheral Modules for controlling the desired operation of the device. These registers are implemented as static RAM, from 0xF80 thru 0xFFF (up to 128SFRs).

Oscillator modes

The PIC18FXX2 can be operated in eight different Oscillator modes. The user can program three configuration bits (FOSC2, FOSC1, and FOSC0) to select one of these eight modes:

1. LP Low Power Crystal
2. XT Crystal/Resonator
3. HS High Speed Crystal/Resonator
4. HS + PLL High Speed Crystal/Resonator with PLL enabled
5. RC External Resistor/Capacitor
6. RCIO External Resistor/Capacitor with I/O pin enabled
7. EC External Clock
8. ECIO External Clock with I/O pin enabled

In XT, LP, HS or HS+PLL Oscillator modes, a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation.

Atenció : seleccionem XT mode, 4 MHz crystal, C1 = C2 = 22 pF.

For RCIO oscilator configuration, the values are :
100K > R(ext) > 3K ; C(ext) > 20pF
Page 294, Bibl-3 : Vdd=5,0 v, C=20pF, R=3K3 => F(osc)=3,5 MHz.

Configuration bits

There are several features intended to maximize system reliability, minimize cost through elimination of external components, provide power saving Operating modes and offer code protection.

The configuration bits can be programmed (read as '0'), or left unprogrammed (read as '1'), to select various device configurations. These bits are mapped starting at program memory location 300000h. The user will note that address 300000h is beyond the user program memory space. In fact, it belongs to the configuration memory space (300000h - 3FFFFFh), which can only be accessed using Table Reads and Table Writes.

The sequence of events for programming configuration registers is:

Load table pointer with address of configuration register being written.
Write a single byte using the TBLWT instruction.
Set EEPGD to point to program memory, set the CFGS bit to access configuration registers, and set WREN to enable byte writes.
Disable interrupts.
Write 55h to EECON2.
Write AAh to EECON2.
Set the WR bit. This will begin the write cycle.
CPU will stall for duration of write (approximately 2 ms using internal timer).
Execute a NOP.
Re-enable interrupts.

CFG

CONFIG1H

bit 7 bit 0 .---------.---------.---------.---------.---------.---------.---------.---------. | --- | --- | OSCSEN/ | --- | --- | FOSC2 | FOSC1 | FOSC0 | .---------.---------.---------.---------.---------.---------.---------.---------.
- bit 5 = Oscilator System Clock Switch Enable
  1 = disables "oscilator system clock switch" option ; 0 = oscilator switching is enabled.
- bits2:0 : Oscilator Selection bits :
  - 111 = RC oscillator with OSC2 configured as RA6 [*]
  - 110 = HS oscillator with PLL enabled
  - 101 = EC oscillator with OSC2 as RA6
  - 100 = EC oscillator with OSC2 as divide-by-4 clock output
  - 011 = RC oscillator
  - 010 = HS oscillator
  - 001 = XT oscillator
  - 000 = LP oscillator
[*] Default (unprogrammed) value := 0b--1- -111 ;
Atenció : s'ha de programar a 0b0010.0001, x'21, modus "XT" ;

MPLAB IDE v8.0 : Configure + Configuration bits.

Main Registers

INTCON

bit 7 bit 0 .---------.---------.---------.---------.---------.---------.---------.---------. | GIE | PEIE | TMR0IE | RBIE | GIE | TMR0IF | INT0IF | RBIF | .---------.---------.---------.---------.---------.---------.---------.---------.
- bit 7 = Global Interrupt Enable.
  1 = enables all unmasked interrupts. 0 = disables all interrupts.
- bit 6 = Peripheral Interrupt Enable.
  1 = enables all unmasked peripheral interrupts. 0 = disables all peripheral interrupts.
- bit 5 = Timer0 Overflow Interrupt Enable.
  1 = enables the TMR0 overflow interrupt. 0 = disables the TMR0 overflow interrupt.
- bit 4 = External Interrupt Enable.
  1 = enables the INT0 external interrupt. 0 = disables the INT0 external interrupt.
- bit 3 = RB Port Change Interrupt Enable.
  1 = enables the RB port change interrupt. 0 = disables the RB port change interrupt.
- bit 2 = TMR0IF Overflow Interrupt Flag.
  1 = TMR0 register has overflowed (must be cleared in soft). 0 = TMR0 register did not overflow.
- bit 1 = INT0IF : INT0 External Interrupt Flag.
  1 = INT0 external interrupt occurred (must be cleared in soft). 0 = external interrupt did not occur.
- bit 0 = RBIF : RB Port Change Interrupt Flag.
  1 = at least one of the RB7:RB4 pins changed state (must be cleared in soft). 0 = none of the RB7:RB4 pins have changed state.
ADCON0

bit 7 bit 0 .---------.---------.---------.---------.---------.---------.---------.---------. | ADCS1 | ADCS0 | CHS2 | CHS1 | CHS0 | GO/-DON | - | ADON | .---------.---------.---------.---------.---------.---------.---------.---------.
- bit 7-6 = A/D conversion clock select bits 1 and 0.
- bits 5-3 = Analog channel select bits.
- bit 2 = A/D conversion status
  1 = A/D conversion in progress 0 = A/D conversion not in progress
- bit 0 = A/D on bit
  1 = A/D converter module is powered up 0 = A/D converter module is shut-off
ADCON1

bit 7 bit 0 .---------.---------.---------.---------.---------.---------.---------.---------. | ADFM | ADCS2 | - | - | PCFG3 | PCFG2 | PCFG1 | PCFG0 | .---------.---------.---------.---------.---------.---------.---------.---------.
- bit 7 = A/D result format select bit
  1 = right justified. 6 most significant bits of ADRESH are '0'. 0 = left justified. 6 least significant bits of ADRESL are '0'.
- bit 6 = A/D conversion clock select bit 2.
- bits 3-0 = A/D port configuration control bits.

Instruction set

Mnemonic	Meaning
BCF	bit Clear
BSF	bit Set
BTFSC	bit test, skip if Clear
BTFSS	bit test, skip if Set
CLRF	clear f
DECF	decrement f
DECFSZ	decrement, skip is zero
INCF	increment f
MOVF	move f
MOVFF	move fs to fd
MOVLW	move literal to register W
MOVWF	move WREG to f
SETF	set f

Timer control

Timer0 can operate as a timer or as a counter. The TMR0 interrupt is generated when the TMR0 register overflows from FFh to 00h in 8-bit mode, or FFFFh to 0000h in 16-bit mode.
Timer mode is selected by clearing the T0CS bit. In Timer mode, the Timer0 module will increment every instruction cycle (without prescaler).
Counter mode is selected by setting the T0CS bit. In Counter mode, Timer0 will increment, either on every rising or falling edge of pin RA4/T0CKI.

Registers associated with Timer0 :

TMR0L - timer0 Module Low byte register.
TMR0H - timer0 Module High byte register.
INTCON
- GIE
- PEIE
- TMR0IE
- TMR0IF
T0CON
- (7) TMR0ON - Timer0 On/Off Control bit. 1 = enables Timer0; 0 = stops Timer0.
- (6) T08BIT - Timer0 8-bit/16-bit Control bit. 1 = Timer0 is a 8-bit timer/counter; 0 = 16-bit.
- (5) T0CS - Timer0 Clock Source Select bit. 1 = transition on T0CKI pin; 0 = internal instruction cycle.
- (4) T0SE - Timer0 Source Edge Select bit. 1 = high-to-low; 0 = low-to-high.
- (3) PSA - Timer0 Prescaler Assignement bit. 1 = Timer1 prescaler NOT asigned; 0 = prescaler assigned.
- (2) T0PS2 - Timer0 Prescaler Select bits :
- (1) T0PS1 - 000 = 1:2 prescale, 001 = 1:4, 010 = 1:8, 011 = 1:16,
- (0) T0PS0 - 100 = 1:16, 101 = 1:64, 110 = 1:128, 111 = 1/256 prescale value.

Set Timer 0 : set TMR0HyL + set INTCON + start Timer0. Stop Timer 0 : T0CON := 0x00 ; (7) disable. Start Timer 0 : T0CON := 0xC8 ; (7) enable, (6) 8-bit, (3) no prescaler.

Resum de la configuració

CONFIG1H := 0b0010.0001 ; // XT mode

Port "A" :

CLRF PORTA ; Initialize PORTA by clearing output data latches CLRF LATA ; Alternate method to clear output data latches MOVLW 0x07 ; Configure A/D MOVWF ADCON1 ; for digital inputs MOVLW 0xCF ; Value used to initialize data direction MOVWF TRISA ; Set RA<3:0> as inputs ; RA<5:4> as outputs

ADCON1 := 0b0000.1110 ; // ADFM=0(bit7) => left justify ADRESH+L, PCFG=1110(bits3-0) => AN0 analog, Vref=Vdd;

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ADC

The ADRESH and ADRESL registers contain the (10-bit) result of the A/D conversion. This register pair is 16-bits wide. If ADFM=1 then it is Right justified. If ADFM=0 then it is Left justified. When the A/D conversion is complete, the result is loaded into the ADRESH/ ADRESL registers, the GO/DONE bit (ADCON0<2>) is cleared, and A/D interrupt flag bit, ADIF is set.

The ADCON1, TRISA and TRISE registers control the operation of the A/D port pins. The port pins that are desired as analog inputs, must have their corresponding TRIS bits set (input).

The following steps should be followed for doing an A/D conversion:

Configure the A/D module:
- Configure analog pins, voltage reference and digital I/O (ADCON1)
- Select A/D input channel (ADCON0)
- Select A/D conversion clock (ADCON0)
- Turn on A/D module (ADCON0)
Configure A/D interrupt (if desired):
- Clear ADIF bit
- Set ADIE bit
- Set GIE bit
- Set PEIE bit
Wait the required acquisition time.
Start conversion:
- Set GO/DONE bit (ADCON0)
Wait for A/D conversion to complete, by either:
- Polling for the GO/DONE bit to be cleared (interrupts disabled)
OR
- Waiting for the A/D interrupt
Read A/D Result registers (ADRESH/ADRESL); clear bit ADIF if required.
For next conversion, go to step 1 or step 2 as required.

[Bibl-3], chapter 17.

A/D conversion code sample.
Al utilizar un periférico, no importa de que microcontrolador, lo recomendable es atenerse a las banderas de estado o status. En el registro ADCON0, el bit 2 es llamado "GO/-DONE". Se usa para arrancar, pero también indica el estado. Escribes un uno para arrancar la conversión, y mientras permanece en uno, el convertidor está trabajando. Al momento que la conversión termina, el bit "GO/-DONE" cae a cero. Eso está en la hoja de datos del microcontrolador. Para no desperdiciar ciclos, es preferible usar una rutina de interrupción de fin de conversión.

.

Detallets

The PIC18FXX2 oscillator design requires the use of a parallel cut crystal.

[Bibl-1]

Sample code is in the 18F452 datasheet.

After battling with a 18F452 for ages, trying to get it to run at 40 MHz using the PLL_HS with a 10 MHz resinator, all I could get it to do was oscilate at 10 MHz. The solution is to add a 4M7 resistor across the osc1 and osc2 pins. Works like a charm!

url

Each ADC needs a reference voltage which defines 100% or 0xFF (for a 8-Bit ADC). In the case of your PIC there is a matrix in the datasheet on page 184, chapter 17.

ICSP

pin name	pin	type	description
MCLR/Vpp/RE3	1	power	programming enable
Vdd	11, 32	power	power supply
Vss	12, 31	power	ground
RB5/PGM	38	input	low voltage input
RB6/PGC	39	input	serial clock
RB7/PGD	40	input	serial data

In this mode, the RB5/PGM pin is dedicated to the programming function and ceases to be a general purpose I/O pin. The trade off is, if LVP is enabled, PGM pin cannot be used as I/O anymore. During programming, VDD is applied to the MCLR/VPP pin. To enter Programming mode, VDD must be applied to the RB5/PGM, provided the LVP bit is set. While in low voltage ICSP mode, the RB5 (PGM, pin 38) pin can no longer be used as a general purpose I/O pin, and should be held low during normal operation to protect against inadvertent ICSP mode entry.

Vpp = High voltage ICSP programming enable pin.
MCLR = Master Clear (Reset) input. This pin is an active low RESET to the device.

The LVP bit defaults to a ('1') from the factory.

19.8, Low Voltage ICSP Programming, DS39564C-page 210 [212/332]

PGM = Low Voltage ICSP programming enable pin.
PGC = In-Circuit Debugger and ICSP programming clock pin.
PGD = In-Circuit Debugger and ICSP programming data pin.

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LVP - programador per al 18F452

HW : ART2003 - T42:\Fonts\PIC\ART2003\ART2003-LVP.pdf. LVP cable. guestbook/questions.
SW : WinPic800 url - [T42:\Fonts\PIC\ART2003\WinPic800.zip]
SW : IC-PROG - [T42:\Fonts\PIC\ICprog]

For reading and writing program memory using this adapter, you also have to apply power to the PIC (+5V at Vdd) and tie MCLR to high level (Vdd); Microchip suggests to use a resistor for MCLR because of latch-up risk. An oscillator circuit doesn't have to be connected. Of course, connect the three lines PGD, PGC and PGM to this adapter, too.

Since you use Low Voltage Programming-mode, pin PGM (38 = RB5/PGM) is not usable for I/O. If you programm a PIC in this manner, always ensure PGM is pulled low in the application (e.g. by adding 10K to ground) even if the schematics look different. Otherwise the PIC might enter programming mode instead of normal working mode.

LVP-mode is enabled by high level on pin PGM. The second 10k resistor at PGM pulls this pin to ground if no PC is connected and thus safely prevents the PIC from entering LVP-mode.

Don't high voltages on RS-232 harm the PIC? All the PIC's I/O-pins are protected against electric discharge by internal diodes to Vss and Vdd (see datasheet!). With a resistor limiting the pin current, all voltages will get clamped between 0V and 5V.

For programming, you can use ICProg from Bonny Gijzen. Configure as JDM-type-programmer ... (JDM homepage)

D-9 :
pin3 = TxD,
pin 4 = DTR,
pin 5 = GND,
pin 7 = RTS,
pin 8 = CTS.

PIC :
PGD = pin 40,
PGC = pin 39,
PGM = pin 38.
MCLR = pin1 [Vih := Vdd + 4v]
Vdd (+) = pin 11 i 32.
Vss (-) = pin 12 i 31.

Before building this programmer, be sure that your serial port (RS232) have at least 11 Volts. needed to program the Series "C" (12C50X, 16C84, etc). With 9.5 volts you will be able to program only a few microcontrollers.

If you get an error while programming, change the 1mF capacitor to 0,47mF.

Doesn't work? Maybe the voltage at the port is not good enough. Put a 10mF capacitor between the VDD and GND.

Melting mr's Lothar design (up right) with mr's Jose Pino design (up left), here you have a working LVP for 18F452 !

Que fa el IC-prog ? What does IC-prog ?

Posa TxD (pin 3/9 x PGM and "delayed" x MCLR) a "ON".
RTS (pin 7/9 x PGC) i DTR (pin 4/9 x PGD) estan alternant {as Data and Clock}

Atenció : per programar el PIC, s'ha de

posar el cable des R(27ohms) al Pin1 del PIC
treure el cristall
( no fer servir "RS232 check tester" )

Per ejecutar el PIC, aquestes mesures s'han de invertir, es clar ...

Mesures del RS-232 :

Equip Voltatge TxD & RTS
Kayak 9,1 volts.
P4 10 volts.
RAP 10,5 volts.
P90 10,0 volts.
PC-330 9,7 volts.
PCI port ?

Poso IC-prog a P4/RAP => "File + Open" tanca el programa !?

c:> ic-prog.exe -lFILENAME.HEX -p

IC-Lab problems win XP

Símptomes : "Privileged instruction", "Access violation ...",

Src : url [582447 bytes]
get ICprog.sys - url [5248 bytes]
place it where ICprog.exe is
ICprog.exe properties + Compatibility + "Run this program in compatibility mode for" : "Windows 2000".
ICprog + Settings + Options + "Misc" : "Enable NT/2000/XP driver".

P4 - mola {21-09-2008} !

MPLAB Tools v 8.00

8-bit MCU's : PIC10x, PIC12x, PIC16x, PIC17x, PIC18x and rfPIC devices.
16-bit MCU's : dsPIC30x, dsPIC33, PIC24x.
32-bit MCU's : PIC32 devices.

Install :

8-bit MCUs
uChip Applications :
- MPASM = MPASM + MPLINK + MPLIB.
- MPLAB C32 = ASM32, LINK32, C32 C compiler y Utilities.
- MPLAB IDE :
  - AN851 = FLASH Bootloader
  - MPLAB ICD 2 = in-circuit debugger
  - MPLAB SIM = simulator
- MPLAB IDE Tools :
  - Data Monitor and Control Interface

New Project :

device := 18F452 ;
toolsuite := MPASM ;
path := d:\Projects\ ;

url

Few basic ASM programs

list p=16f452 #include p18f452.inc Dest equ 0x0B ; define constant org 0x0000 ; Reset vector goto Start ; skip interrupt vectors org 0x0100 ; user program start Start movlw 0x0A movwf Dest ; bcf Dest,3 ; goto Start ; loop end

A more interesting one :

title "PIC18F452 counting program" list p=18f452,f=inhx32 #include <p18f452.inc> ; This "header file" contains all the PIC18F252 special function register names and addresses. ; This file is located in the same directory as MPASMWIN.EXE. COUNT equ 0x00 DVAR equ 0x01 DVAR2 equ 0x02 org 00h ; reset vector goto Start org 1Ch Start clrf WREG ; clear W register movwf PORTC ; clear PORTC movwf TRISC ; config PORTC as outputs Init clrf COUNT ; clr count IncCount incf COUNT,F ; increment count movf COUNT,W ; movwf PORTC ; display on port c call Delay ; wait goto IncCount ; loop ; Delay movlw 0xFF ; set delay loop movwf DVAR2 ; D0 movwf DVAR ; reset inner loop D1 decfsz DVAR,F goto D1 decfsz DVAR2,F goto D0 return end

[Bibl-4]

A simple program fragment that reads a string of fixed characters is:

movlw low string ; get low byte of string address movwf TBLPTRL ; set the low byte of pointer movlw high string ; repeat for high byte movwf TBLPTRH nextchar tabrd * ; moves char to TABLAT movf TABLAT,W ; test for null char btfsc STATUS,Z ; ANSI string delimiter goto endofstring call LCD_CHAR ; do the display part incf TBLPTRL btfsc STATUS,C ; remember to check for overflow incf TBLPTRH goto nextchar endofstring

url

The data strings are stored in memory like this :

DB 't', 0x55, '\n', 0x00 ; 8-bit data. DT "Version 1.2a, 22/04/2008." ; RETLW 8-bit.

An improved sample, from MicroChip :

table.zip

First Things First

Flashing LED. 16F877 sample. Disco Fever (0x09 @ 18F452). Codi (20/04/2008) : UNO.ASM
7-segment sequence. Codi (27/04/2008) : DOS.ASM
Switch 2 LED
Piano Switch to Piano LED
A/D converter. 0x09 sample.

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My story with PIC

22/04/2008 : LVP from Kayak - MPLAB & IC-prog.
- TD = 1, RTS & DTR = {on/off, very fast}
  Verify failed at address 0.
- Change Direct IO to Windows API => molt mes lent.
  Verify failed at address 0.
  If the oscillators running you can't program a PIC; you need to switch it to programming mode BEFORE the oscillator can start up. When doing ICSP this can often be difficult, usually both your circuit and programmer need to be specially designed for the purpose.
  Nigel Goodwin
  url
- Remove Xtal & Delay = 16.
  Verify failed at address 0.
  Llum verd = -8,5 volts, llum vermell = +8,9 volts.
Conclusió : mesurar RS-232 a diversos PCs.

Verify failed at 0x000

The most common cause of this error is too little voltage on the MCLR pin.
SAG : 8,6v @ Kayak.

Vih = Vdd + 4v ...

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Forums I use

[1] www.picbasic.co.uk - [r/b].
[2] www.edaboard.com - [r/b].
[3] http://www.electro-tech-online.com/forumdisplay.php?f=15 - [r/b].
[3] www.winpicprog.co.uk/bbs - ?wait?

[1] + cheap ICSP programmer by Squibcakes {Schematics}
I have used it on 16F84, 16F62X, 16F87X chips without problems. To make it:

TXD (3) >-----[4.7k]------ VPP GND (5) ------------------ VSS DTR (4) >-----[4.7k]------ DATA CTS (8) <----------------- DATA RTS (7) >-----[4.7k]------ CLK

url

[2] Microcontrollers + "PIC Programmer ?" (autor = mitesh, 12/Feb/2008)

[3] Electronic Circuits Projects Diagrams Free > Electronics Categories > Micro Controllers. "cant program 18F452 using LVP"

Forth

One easy way is to do it with Forth ! FlashForth is a a Forth OS that runs on the PIC18F452. See http://flashforth.sourceforge.net/
After you have programmed the FF kernel to the PIC, you can via the serial port expirement with how the PIC works.
Here is the Forth source code of how to read the AD converter on the PIC18F452.

hex ram ffc4 constant adresh ffc3 constant adresl ffc2 constant adcon0 ffc1 constant adcon1 ff80 constant porta ff92 constant trisa bin : adinit ( -- ) \ Init the registers 00111111 trisa c! 11001100 adcon1 c! 10000001 adcon0 c! ; hex : ad@ ( channel -- n ) 3 lshift adcon0 c@ c1 and or adcon0 c! \ Select the AD channel pause \ Aquisition delay 4 adcon0 mset \ Start conversion begin 4 adcon0 mtst 0= \ Wait for conversion to complete until adresl @ \ Fetch the result ;

Now with the command " 1 ad @ " you can read the AD conversion result for channel 1 !

adinit ok 1 ad@ ok . 3ff ok

The converted value 3ff is returned on the parameter stack and printed with "." .

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Llibres

[1] Microchip code examples

[2] Microchip Application Notes, 8-bit PIC microcontrollers Application Notes

[3] Microchip PIC18Fxx2 Datasheet {39564c.pdf}

[4] MPLAB_IDE_v6.xx.Quick_Start_Guide_pic-guide-51281c.pdf

[5] MPLAB_IDE_Users_Guide_51519a.pdf [url]

[6] MPASM_Users_Guide_33014J.pdf [url]

[7] PICkit Programmer Debugger User's Guide - ICSP at Chapter 3 [*****]

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PIC programmers

Olimex PIC-PG2C programmer : Portugal = 18,81 €

Wisp 628 & 648 programmer

Google + ICD2 clone : InchWorm, discontinued => InchWorm + {$45 US MSRP}

Microchip PICkit2

SAG 1-st email =>
"PICSTART plus Development System", code "DV003001". Tag = 136,24 €

DV164120 - PICkit 2 Starter Kit = 34 € PICkit 2 Microcontroller Programmer and a PICkit 2 Low Pin Count Demo Board containing a PIC16F690 PDIP.
PG164120 - PICkit 2 Microcontroller Programmer = 24 €

SAG 2-nd email =>
You need to buy the following items along with pickit2 programmer kit (PG164120).

AC162049 : Universal Programming module (socket)
AC164110 : RJ-11 to ICSP adapter to connect PICkit 2 (cable)

While using 40pin universal programming module, removal of resistor R1 is required to prevent VPP errors (from AC162049).

PG164120 = 23,84 pickit2 programmer AC162049 = 27,24 universal programming module (socket) AC164110 = 6,81 RJ-11 to ICSP adapter (cable)

Total = 57,89 €

Clon rus al PIC Start Plus

picallw - dead ?

PonyProg

Willem

Google + JDM2 programmer

kitsrus.com

OshonSoft (paralel port)

ProPIC-2

USB {alemà only}

ezPIC, code 1001-3477 = X USD. Sunrom, India.
It has been replaced by new and better picex1000

Jose Pino
Before building this programmer, be sure that your serial port (RS232) have at least 11 Volts. At least 11 volts is needed to program the Series "C" (12C50X, 16C84, etc). With 9.5 volts you will be able to program only a few microcontrollers.
Doesn't work? Maybe the voltage at the port is not good enough. Put a 10mF capacitor between the VDD and GND (Indicated by the blue arrows in the schematic).

Simplificar el seu esquema per 40 pins.

MicroElectronia : PicFlash (12USD) + PicFlash2 (programmer).

.

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Dubtes

Com es fa per fregir un PIC per sempre ?

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Links

Microchip Homepage

Wiki

Good tutorial [*****]

Google NewsGroup : comp.arch.embedded

Datasheet [Microchip, 39564c.pdf]

PIC list {ajudes, checklists, etc}

Low cost, low speed A/D conversion for embedded systems

Beginner's check list

MPASM [es]

Start Now with MPLAB C18 C Compiler Part 2: Examples

QwikFlash development board.

Interrupt programming sample & theory

www.picbasic.co.uk good forum

www.winpicprog.co.uk, WinPicProg 1.91 by Nigel Goodwin, free programming software. Hi-Tech [*****]. Good Forum, too.

Main differences between PIC 18F452 and 16F877 - note that both are 8 bit microcontrollers.

16F877(A) is a 14 bit core PIC, with only 35 instructions.
18F452 is a 16 bit core PIC, with 75 instructions.
16F877(A) runs at 20MHz maximum clock
18F452 can run at 40MHz maximum clock
16F series have paged memory
18F series don't.

Botiga

Botiga : Quasar Electronics - buy a P16PRO40 (uses Paralel port)
Replaced by PICALL

Diotronic Madrid : Juan Bravo, 58

Conectrol, Jorge Juan 57, 91.566.15.20
Velleman VM134 (50€ o 47€) + PS1508 (15v, 0,8A) specs.

Microchip data sheet finder : 18f4520

.