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losing pics. ICD-U40 problem.

 
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ivanperino



Joined: 08 Jun 2006
Posts: 14

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losing pics. ICD-U40 problem.
PostPosted: Fri Mar 16, 2007 4:40 pm     Reply with quote

PIC16F88 - ICD v2.73 - ICD-U40 firmware v2.14 rev#100 - PCHW v4.017
Hi. We think we have serious problems with an ICD-U Programmer. We have used it for a long time until a stack happened. The NOMCLR fuse and a piece of code make the PIC useless, since it becomes undetectable from the ICD! the message "Couldn't detect target chip" appears after programming. We have tested with 2 PIC 16F88 and 2 PIC16F819 and both seem damaged.

I can show you the code if it is necessary. It is a very large one

Please, any orientation or help will be crucial at this stage. Thanks for your support.

Ivan Perino, Sergio Calderon
San Luis University - Argentina

Code:
#include <16F88.h>
#device ADC=10

#fuses WDT,INTRC_IO, PUT, NOBROWNOUT, NOLVP, NOWRT, NOPROTECT, NOMCLR
#use delay(clock=8000000)

#use rs232(baud=38400,xmit=PIN_A2,rcv=PIN_B0)
#define salida_pos pin_a7    //positivo para medir
#define salida_R1 pin_a0     //activa la resistencia R1.
#define salida_R2 pin_a1     //activo la resistencia R2.

#ifndef EEPROM_SDA                                                           
#define EEPROM_SDA  PIN_A3                                                   
#define EEPROM_SCL  PIN_A6                                                   
#endif                                                                       
#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL, FAST=400000)               
#define PIN_COM_PC  PIN_A5
...
...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Mar 16, 2007 5:59 pm     Reply with quote
Quote:
The NOMCLR fuse and a piece of code make the PIC useless:

#fuses WDT,INTRC_IO, PUT, NOBROWNOUT, NOLVP, NOWRT, NOPROTECT, NOMCLR


The problem is the use of NOMCLR and INTRC_IO (or INTRC) at the
same time. It can cause the PIC to become un-programmable.
The Microchip ICD2 (and MPLAB) warn against doing this.

Read some topics on the Microchip forum about this problem:
http://forum.microchip.com/tm.aspx?m=147929
http://forum.microchip.com/tm.aspx?m=232283

Here is an article on it from Microchip Tech Support:
http://support2.microchip.com/KBSearch/KB_StdProb.aspx?ID=SQ6UJ9A003LD0
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