pic16F88 problems

[sskeet]

Hi, I have had success testing other chips, but this 16F88 is driving me crazy...I have read all over this forum and google and cannot find out why...

First off, I have 5v power and ground hooked up correctly and have MCLR pullup attached. I am using picbasic pro 2.46 and EPIC programmer.

I am just trying to verify that I can do simple I/O before heading into my project, but when I test my blink program, no matter what I set the PAUSE to, the LED just flickers like crazy and sometimes very randomly...

Here is my code:
----------------------------
@ DEVICE INTRC_OSC, LVP_OFF, WDT_OFF, MCLR_OFF

DEFINE OSC 8

OSCCON = %01110000 ' INTRC = 8MHz

Pause 500 ' Wait for startup

loop:

LOW PORTB.4
Pause 5000 ' Wait 5 second

HIGH PORTB.4
Pause 5000 ' Wait 5 second
Goto loop ' Do it forever

END
------------------------------

The input voltage is stable, and I have 2 16f88 chips, so it is not a bad chip.

Thanks!

[Dave]

sskeet, What are your settings when programming the micro? Do you have the OSC setting set for INTOSC? Check the settings when programming the chip as these will override the source code settings. HTH

Dave Purola,
N8NTA

[sskeet]

sskeet, What are your settings when programming the micro? Do you have the OSC setting set for INTOSC? Check the settings when programming the chip as these will override the source code settings. HTH

Dave Purola,
N8NTA

You mean the Oscillator setting in EPIC? It is set to INTRC.

I have tried both INTRC and INTRC (Clockout) and both give the same results. It must be something else I am not declaring in the startup of the code???

[Bruce]

Your code is fine. Under the Options menu in the EPIC software, make sure you have Update Configuration & Reread File Before Programming checked.

These options force the EPIC software to load & use config fuse settings embedded in your code, and always open/use the latest version of your .hex file.

[sskeet]

Your code is fine. Under the Options menu in the EPIC software, make sure you have Update Configuration & Reread File Before Programming checked.

These options force the EPIC software to load & use config fuse settings embedded in your code, and always open/use the latest version of your .hex file.

I do not have the stuff in front of me right now, but I do have the software installed here at work, and I just checked the default settings in EPIC and Update Configuration is checked by default, but Reread File Before Programming is not. However, if I were to close EPIC and recompile, then reload EPIC, wouldnt that do the same thing? Because thats what I was doing every time anyway.

[Bruce]

If your settings are the same at home, and it is loading & using config word settings in your .hex file, then i would have to suspect something in your circuit since your code posted as-is above works just fine.