Somasundaram wrote:
>
> Sorry, I didn't put it clear.
>
> test_for_bit equ 0x27
> value_to_test equ 0x26
>
> Say value 5 is stored in the file register 0x27
> I would like to test the <test_for_bit> bit of <value_to_test>.
>
> BTFSS value_to_test,[value stored in test_for_bit] -> Test the bit5 in the
> value stored at 0x26
Try this:
        MOVF    TEST_FOR_BIT,W
        MOVWF   TEMP1
        MOVF    VALUE_TO_TEST,W
        MOVWF   TEMP2

        ;ABOVE ONLY NEEDED IF YOU WANT TO RETAIN ORIGINAL VALUES

        MOVF    TEMP1,F
        BTFSC   STATUS,Z
        GOTO    TEST2   ;IF TEMP1 =0, CHECK ONLY LSB

TEST    BCF     STATUS,C
        RRF     TEMP2,F
        DECFSZ  TEMP1,F
        GOTO    TEST
TEST2   BTFSS   TEMP2,0
        GOTO    IF_0
        GOTO    IF_1


> Something like: I would like to count the number of 1's in the value ( at
> 0x26) using btfss instruction.

I take it this is part of your first question so change above to:
        MOVF    TEST_FOR_BIT,W
        MOVWF   TEMP1
        MOVF    VALUE_TO_TEST,W
        MOVWF   TEMP2
        CLRF    TEMP3

        ;ABOVE ONLY NEEDED IF YOU WANT TO RETAIN ORIGINAL VALUES

        INCF    TEMP1,F ;EXTRA COUNT TO CHECK LSB

TEST
        BTFSC   TEMP2,0
        INCF    TEMP3,F ;CONTAINS NUMBER OF "1" BITS
        BCF     STATUS,C
        RRF     TEMP2,F
        DECFSZ  TEMP1,F
        GOTO    TEST
        GOTO    NEXT.....

This clear for you? I did not take any "short cuts" here so that you can
see what can be done.

Quentin