DM164120-1 Microchip Technology, DM164120-1 Datasheet - Page 22

• Manufacturer Part Number: DM164120-1
• Description: BOARD DEMO PICKIT 2 LP COUNT
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM164120-1

• Contents: 3 Boards (1 Populated, 2 Bare)
• Processor To Be Evaluated: PIC16F690
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC16
• Silicon Core Number: PIC16F
• Silicon Family Name: PIC16F6xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: 28-pin PIC16C, 16F, 18C, 18F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low Pin Count Demo Board User’s Guide
DS51556A-page 18
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:
EXAMPLE 3-4:
Start
MainLoop
OndelayLoop
BSF
CLRF
BCF
MOVLW
MOVWF
MOVF
MOVWF
DECFSZ
GOTO
DECFSZ
GOTO
BCF
RRF
BTFSC
BSF
GOTO
ROTATE LEFT
ROTATE EXAMPLE
STATUS,RP0
TRISC
STATUS,RP0
0x08
Display
Display,w
PORTC
Delay1,f
OndelayLoop
Delay2,f
OndelayLoop
STATUS,C
Display,f
STATUS,C
Display,3
MainLoop
Carry
;select Register Page 1
;make I/O PORTC all output
;back to Register Page 0
;Copy the display to the LEDs
;Delay .197S
;ensure the carry bit is clear
;Rotate Display right
;Did the bit rotate into the carry?
;yes, put it into bit 3.
File Register
© 2005 Microchip Technology Inc.