Hi!

I have a problem with MPSIM in MPLAB version 6.30 with
12f675 device.  The following code works as expected
in MPLAB 5.70 (simulator v. 7.70), but with the latest
version (simulator v. 8.30) TMR0 doesn't start after
seting PSA bit in OPTION_REG. Am I doing something
wrong (I'm new to MPLAB6) or is it a bug in a
simulator?

Thanks, Samo

code:
        list      p=12f675            ; list directive to
define processor
        #include <p12f675.inc>        ; processor specific
variable definitions


        __CONFIG   _CP_OFF & _CPD_OFF & _BODEN_OFF &
_MCLRE_OFF & _WDT_OFF & _PWRTE_ON &
_INTRC_OSC_NOCLKOUT

;****USEFULL MACROS
BANK0   macro
        bcf     STATUS, RP0     ;switch to bank0  00h-7Fh
;       bcf     STATUS, RP1
        endm
BANK1   macro
        bsf     STATUS, RP0     ;bank1          80h-FFh
;       bcf     STATUS, RP1
        endm
;**********************************************************************
                ORG     0x000             ; processor reset vector
                clrf    PCLATH            ; ensure page bits are
cleared
                goto    main              ; go to beginning of
program


                ORG     0x004             ; interrupt vector
location

                bcf     INTCON, T0IF


                retfie                    ; return from interrupt

main
        BANK1
        clrf    OPTION_REG
        bsf     OPTION_REG, PSA
        BANK0
        clrf    TMR0
        bsf     INTCON, GIE
        bsf     INTCON, T0IE
; remaining code goes here
LOOP
        nop
        nop
        nop
        nop
        nop
        nop
        goto    LOOP
                END                       ; directive 'end of
program'


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