gnupic: problem with gpsim
Subject:
problem with gpsim
From:
Diego ####@####.####
Date:
24 Jun 2002 13:30:46 -0000
Message-Id: <3D13664600000DBF@correo.adinet.com.uy>
Hello, i have a little problem gpsim, I'm sure you could help me.
I'm programming a 16f877, and this is the situation:
I configure TMR0 int, and then goes into a loop waiting for it. The problem
is that my loop is on page 1 of Program Memory and when TMR0 overflows,
the int occurs and the PC must jump to 0004h, but in simulation the PC jump
to 0804h. This is the code I'm using:
list p=16f877
#include "p16f877.inc"
errorlevel -302, -305
__CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _XT_OSC & _WRT_ENABLE_ON
& _LVP_OFF & _DEBUG_OFF & _CPD_OFF
;***** Variables en BANCO0*************************
cblock 0x20
w_temp
status_temp
endc
;**********************************************************************
ORG 0x000
clrf PCLATH
goto main
ORG 0x004
ISR
movwf w_temp
movf STATUS,w
movwf status_temp
desGIE bcf INTCON,GIE
btfsc INTCON,GIE
goto desGIE
movf status_temp,w
movwf STATUS
swapf w_temp,f
swapf w_temp,w
ISRend bcf INTCON,T0IF
bcf INTCON,INTF
retfie
banco0 macro
bcf STATUS,RP0
bcf STATUS,RP1
endm
banco1 macro
bsf STATUS,RP0
bcf STATUS,RP1
endm
main
clrf TMR0
clrf INTCON
banco1
movlw b'11000000'
movwf OPTION_REG
banco0
bsf INTCON, T0IE ; habilito interrupcion de TMR0
bsf INTCON, GIE ; habilito interrupciones globales
otraves
bsf PCLATH,3
bcf PCLATH,4
call loop
goto otraves
org 0800 ; voy a pagina1
loop
nop
goto loop
nop
_0804 nop ; 0804
nop
nop
goto _0804
end
Thanks and excuse my english
Diego
PS: I'm using gpsim 0.20.14 in RedHat 7.1
