Output pin interferes with other pin???????

[kgn340]

here it goes ...

PIC16F88 running from internal 8MHz
PCM v3.215

codes snippet:
output_high(PIN_A1);
delay_ms(100);
delay_ms(100);
delay_ms(100);
output_low(PIN_A0);

symptom:
pin A1 does indeed go HIGH, but after the output_low takes BOTH A0 and A1 low

also, if i try this:
output_high(PIN_A1);
output_high(PIN_A0);

pin A0 will go HIGH but A1 stays low !!!!

what the heck????

any ideas???

(i've isloated the pins and have tried different 16f88 chips).

[PCM programmer]

Look at these two threads, and then post a full test program, which
shows all your i/o port setup code, and your fuses, etc.
ie., how are you setting up the analog port ?

http://www.ccsinfo.com/forum/viewtopic.php?t=22778&highlight=readmodifywrite

http://www.ccsinfo.com/forum/viewtopic.php?t=23756&highlight=readmodifywrite

[croc4]

I had the same problem until I turned off the analog ports
// Turn off the ADC
setup_adc_ports(NO_ANALOGS);

try this and see if things get better

[kgn340]

[Ttelmah]

Yes.
There is a critical difference in these two commands. setup_adc(ADC_OFF), just turns off the ADC, but still leaves the input multiplexer all setup to route the signals to the sampler. Use this, to save power, while the input capacitors are charging, or when the chip is to sleep. Setup_adc_ports, actually configures the inputs.

Best Wishes

[adrian]