gnupic@linuxhacker.org

Subject: GPSIM, P16F877 and weak pull-ups
From: VaclavP
Date: Thu, 11 Sep 2003 11:50:46 +0200

Hello, I would like to test weak pull-ups in gpsim. I have the version 
0.20.14.

When I run "gpsim -pp16f877", in the pin window, pins are normally 
inputs in L. But, if I suppose correctly, when I set RBPU = 0, I should 
see inputs in H.

Is anywhere a problem with this or did I make a mistake somewhere ?

The test program compiled in gpasm-0.11.6 follows:
       list p=16f877, st=ON, x=ON, n=0, f=INHX8M

;      errorlevel -302

#include <p16f877.inc>

	ORG 0000h
	
	bsf	STATUS, RP0
	bcf	OPTION_REG, NOT_RBPU
	bcf	STATUS, RP0
	goto	$
END


Another minor point is incorrectly named register (OPTION_REG/TMR0):
gpsim>
0x0000000000000001  16F877  0x0001  0x1381  bcf tmr0,7
    read: 0xff from option
   wrote: 0x7f to option

Is it possible to change it somewhere or is it expected behaviour ?

Thanks in advance,

Vaclav