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baumgarcX
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| power-on reset execution |
 Posted: Mon Sep 22, 2008 3:15 pm |
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My 16F887 processor does not execute code following power-on resets. It appears to need a hard reset of the MCLR line before it runs.
I vaguely remember having this trouble initially with the 877 processor a ways back.
Is there a line in the .H that helps it wake up after power-on? Or a trick to the MCLR line other than a 47k pull-up?
I removed a lot of extraneous stuff from the standard .H, but it did not seem to help.
.H used
#include <16F887.h>
#device adc=10
#FUSES NOWDT //No Watch Dog Timer
#FUSES
#use delay(clock=20000000)
#use i2c(master, sda=PIN_C4, scl=PIN_C3)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
Thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Sep 22, 2008 5:17 pm |
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| Quote: | | I removed a lot of extraneous stuff from the standard .H, |
Don't ever do this. Restore the original 16F887.H file.
The following program will blink an LED on pin B0.
| Code: | #include <16F887.H>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=20000000)
//===================================
void main()
{
while(1)
{
output_high(PIN_B0);
delay_ms(500);
output_low(PIN_B0);
delay_ms(500);
}
} |
This code assumes that you have a 20 MHz crystal (and associated
capacitors) connected to the PIC. |
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