The first thing I'd try is taking out those first comments.  They should be
ok, but something to try.  Also make sure that you close the file in
whatever you are editing it in.  I few days ago I had similar symptoms
(i.e. no symptoms), and through experimentation I found that it was due to
the file still being open in Excel.  When I closed the file it worked.

Also, make sure your stopwatch is reset to 0, as the file is keyed off of this.

-Erik Reikes


At 01:07 AM 12/28/99 -0500, you wrote:
>I'm using MPLAB 4.12.12, and wrote a demo program for a 12c509a for the
>first time. The program makes a one-chip crystal controlled sq. wave
>oscillator by using 4 GPIO pins (GP0=output, GP1,GP2,GP3=input). I arranged
>for the GP1:GP2:GP3 set to select one of eight frequencies (1/10 Hz, 1, 10,
>100, 1k, 10k, 100kHz) based on input values 000 - 111.
>
>In order to test the program (which also switches dynamically between
>frequencies when inputs are changed), I need to use a pin stimulus file.
>
>I wrote the following sample ("sqwave.sti"):
>
>!12.28.99 23.15     SQWAVE.STI
>!stimulus file for SQWAVE.ASM
>CYCLE   GPIO1  GPIO2  GPIO3
>1       1      0      0
>2       1      1      1
>3       0      1      1
>4       0      0      1
>5       0      0      0
>6       1      0      0
>7       0      1      0
>8       1      0      0
>9       1      1      1
>10      0      1      0
>20      1      0      0
>30      0      1      0
>100     1      1      1
>1000    0      0      0
>
>I reset the program in MPLAB and enabled the pin stimulus file.
>
>But when I run MPLAB step-by-step, the GPIO register stays at b'0000100x'
>instead of matching the stimulus pin values I wanted.
>
>What am I missing? I went ahead and burned the eprom, and the circuit works
>exactly as intended. So there's nothing wrong with the inputs in real life.
>
>Any suggestions? This has to be a simple fix.
>
>
>================================================================
>Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: ral@lcfltd.com
>Least Cost Formulations, Ltd.                   URL: http://lcfltd.com/
>824 Timberlake Drive                            Tel: 757-467-0954
>Virginia Beach, VA 23464-3239                   Fax: 757-467-2947
>
>"Vere scire est per causae scire"
>================================================================