09:39 PM 24/05/98 EDT, you wrote:
>Hello!
>
>I testing this routine for decode a dtmf signal. It was funny because when
>I used the simulator all works properly, but in the real world didn't work.
>
>Any idea.
>
>TIA.
>
>Gustavo
>---------
>list p=16c55
>;
>f0     equ 0
>rtcc   equ 1
>pc     equ 2
>status equ 3
>fsr    equ 4
>porta  equ 5
>portb  equ 6
>portc  equ 7
>reg1   equ 0B
>reg2   equ 0C
>reg3   equ 0D
>aux    equ 0E
>acu    equ 0F
>;
>        org    0
>        goto   inicio
>;
>inicio movlw b'0011'
>       tris  porta
>       movlw .64
>       tris  portb
>;
>       movlw b'11111111'
>       tris  portc
>;
>       bcf   status,6
>       bcf   status,7
>;
>       movlw .177
>       movwf portb
>       nop
>       movlw .12
>       movwf porta
>       nop
>;
>rst    movlw .0
>       movwf acu
>       movwf aux
>
>;
>;
>d_str  btfsc porta,1
>       goto  d_str
>       nop
>       btfss portc,7
>       goto  d_str
>;
>delay  movlw .80
>       movwf reg1
>tres   movlw .64
>       movwf reg2
>dos    movlw .48
>       movwf reg3
>       nop
>       nop
>       nop
>uno    btfsc portc,3
>       goto  cmd_3
>       nop
>       nop
>       decfsz reg3
>       goto   uno
>       decfsz reg2
>       goto   dos
>       decfsz reg1
>       goto   tres
>       goto   rst
>;
>
>cmd_3  nop
>       nop
>       nop
>       bcf portb,0
>       nop
>       nop
>;
>       end
>
>

I don't know what DTMF chip you are using, but what is happening at the end
of CMD_3, you seem to just fall out, does this indicate that you have a DTMF
digit? And where do you read the DTMF digit in? Do you simulate all
possibilities of pin conditions? You also have infinite loop possibility in
UNO, D_STR. Does the programme ever get to the CMD_3 part? Have you tried
forcing the inputs to the expected levels?



Dennis