LPC Demo Board Lessons
EXAMPLE 3-12:
CONVERT BINARY TO GRAY CODE
; Convert 4 bit binary to 4 bit Gray code
;
BinaryToGrayCode
ANDLW 0x0F ;mask off invalid entries
MOVWF temp
MOVLW high TableStart ;get high order part of the beginning of
;the table
MOVWF PCLATH
MOVLW low TableStart ;load starting address of table
ADDWF temp,w ;add offset
BTFSC STATUS,C ;did it overflow?
INCF PCLATH,f ;yes: increment PCLATH
MOVWF PCL ;modify PCL
TableStart
RETLW b'0000' ;0
RETLW b'0001' ;1
RETLW b'0011' ;2
RETLW b'0010' ;3
RETLW b'0110' ;4
RETLW b'0111' ;5
RETLW b'0101' ;6
RETLW b'0100' ;7
RETLW b'1100' ;8
RETLW b'1101' ;9
RETLW b'1111' ;10
RETLW b'1110' ;11
RETLW b'1010' ;12
RETLW b'1011' ;13
RETLW b'1001' ;14
RETLW b'1000' ;15
? 2005 Microchip Technology Inc.
DS51556A-page 35
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