pic - W Register in Assembly Not defined? - Microchip pic16f84a -



pic - W Register in Assembly Not defined? - Microchip pic16f84a -

i using instruction:

dec count movf count,w bsf portb,w

i getting next error: symbol not defined (w) in w ment of course of study register w.

the problematic instruction

bsf portb, w

bsf takes bit number, not register - interestingly enough, when switching capital w goes through assembler, generates other code intended. utilize like

bsf portb, 2 ; set bit number 2 (0b00000100)

instead. if need calculate bit number, have manually, e.g. through rotate instruction, this:

... movlw 0b00000001 ; bit 0 movwf count loop: movfw count ; count => w movwf portb ; count => portb (8 bits!) bcf status, c ; clear carry rlf count, f ; shift left count btfss status, c ; 8 bits rotated? goto loop ; no, go on ...

assembly pic

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