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Low Pin Count Demo Board User’s Guide
Rotate
The rotate instructions ( RRF or RLF ) shift all the bits in the file register right or left by
one position, through the Carry bit. The Carry bit is shifted into the byte and receives
the bit shifted out of the byte. The Carry bit should be cleared before rotation so
unwanted bits are not introduced into the display byte. The Carry bit also indicates
when the display byte is empty. When it is, reinsert the ‘ 1 ’ at bit 3.
PICmicro MCUs have two rotate instructions: Rotate Left ( RLF ) and Rotate Right ( RRF ).
These instructions rotate the contents of a file register and Carry bit one place.
FIGURE 3-2:
ROTATE LEFT
Carry
File Register
EXAMPLE 3-4:
Start
ROTATE EXAMPLE
BSF
CLRF
BCF
MOVLW
MOVWF
MainLoop
MOVF
STATUS,RP0
TRISC
STATUS,RP0
0x08
Display
Display,w
;select Register Page 1
;make I/O PORTC all output
;back to Register Page 0
;Copy the display to the LEDs
MOVWF
OndelayLoop
DECFSZ
GOTO
DECFSZ
GOTO
PORTC
Delay1,f
OndelayLoop
Delay2,f
OndelayLoop
;Delay .197S
BCF
RRF
BTFSC
BSF
STATUS,C
Display,f
STATUS,C
Display,3
;ensure the carry bit is clear
;Rotate Display right
;Did the bit rotate into the carry?
;yes, put it into bit 3.
DS51556A-page 18
GOTO
MainLoop
? 2005 Microchip Technology Inc.
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