Hi

I am fairly new to programming PICs and I have some code I am trying to
understand. It uses a MOVLW where the literal is a label for a routine. Can
you help me understand?

movlw   Ckstrt          ; then make sure start bit persists

Is this a method of addressing? Is the code run for that label and the final
value stored in W?

I've never used this before. Hre's an example of a serial routine.

Idle    btfss   SERIN           ; skip if serial input is space
        goto    idl15
        movlw   BITTIME/2       ; delay 1/2 bit time
        movwf   STime
        movlw   Ckstrt          ; then make sure start bit persists**** LOOK HER
E
        movwf   SState
        goto    w10
;
Ckstrt  decfsz  STime,F  ; verify start bit by sampling at center **** LOOK HERE
        goto    w15
        btfss   SERIN           ; skip if start bit was valid
        goto    idl13
        movlw   BITTIME         ; delay 1 bit time
        movwf   STime
        movlw   Getbit          ; then receive data
        movwf   SState
        movlw   8
        movwf   SCount          ; for 8 bits
        goto    w6