12C671 - GP3 problem

[mackrackit]

Does your config look something like this?

__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF

[financecatalyst]

Does your config look something like this?

__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF

It is:
__config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_ALL

[Acetronics2]

Hi, Finance

could we see your config and declare stubb ???

better, whole PBP program if possible ?

Many, many reasons possible .... and crystal ball saturated.

Alain

[financecatalyst]

DEFINE NO_CLRWDT
DEFINE OSC 4
Define OSCCAL_1K 1
@ __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_ALL
'// For PIC12C671
include "modedefs.bas"

'// Define variables
ToTx VAR GPIO.0
PAUSE 30
'// OSCCAL=0
TRISIO = %111110
OPTION_REG = %10000000
ToTx = 0
INTCON=0
ADCON0.0=0
ADCON1=7

send:
if gpio.1=0 then
serout ToTx,N2400,["G0"]
Low ToTx
pause 10
endif

if gpio.2=0 then
serout ToTx,N2400,["G1"]
Low ToTx
pause 10
endif

if gpio.3=0 then
serout ToTx,N2400,["G3"]
Low ToTx
pause 10
endif

if gpio.4=0 then
serout ToTx,N2400,["G5"]
Low ToTx
pause 10
endif

goto send
end

[Acetronics2]

re,

1) did you try a simple pin test ??? just to verify pin is still alive ???

2) did you verify your 10k is Ok ??? ( logic 1 on pin when nothing done )

Also, Did you try enabling the CLR Watchdog ??? ...

Do all '671 react like this ???

Alain

[financecatalyst]

Hi, for some reason when I check the voltage on all pins, every pin except GP3 has 5V, whereas I don't know why GP3 is showing only 0.5V. They all are held high (5V) with 10K.

I also tried with 1K then 470Ohm, but voltage on GP3 is not going above 0.8V after that. Also just want to add that, my circuit is in such a way that it only gets power when a button is pressed. Buttons bring in the -Ve supply to the system from a 12V battery, also the -Ve goes to the 7805 so PIC gets its 5V as well.

[Acetronics2]

Hi, for some reason when I check the voltage on all pins, every pin except GP3 has 5V, whereas I don't know why GP3 is showing only 0.5V. They all are held high (5V) with 10K.

.

That looks much like a fried pin ... as it is an " input only " pin ...
You have to take care of these pins ... cause there's no clamping diode to VDD : must be treated as a full CMOS input with antistatic discharges handling precautions.

Alain