PIC16F627A_05 Datasheet, PDF (128/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
RRF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Rotate Right f through Carry
[ label ] RRF f,d
0 ≤ f ≤ 127
d ∈ [0,1]
See description below
C
00
1100 dfff ffff
The contents of register ‘f’ are
rotated one bit to the right
through the Carry Flag. If ‘d’ is
‘0’, the result is placed in the W
register. If ‘d’ is ‘1’, the result is
placed back in register ‘f’.
C
REGISTER F
Words:
Cycles:
Example
1
1
RRF
REG1, 0
Before Instruction
REG1 = 1110 0110
C =0
After Instruction
REG1 = 1110 0110
W = 0111 0011
C =0
SLEEP
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
[ label ] SLEEP
None
00h → WDT,
0 → WDT prescaler,
1 → TO,
0 → PD
TO, PD
00
0000 0110 0011
The power-down Status bit, PD
is cleared. Time out Status bit,
TO is set. Watchdog Timer and
its prescaler are cleared.
The processor is put into Sleep
mode with the oscillator
stopped. See Section 14.8
“Power-Down Mode (Sleep)”
for more details.
1
1
SLEEP
SUBLW
Syntax:
Operands:
Operation:
Status
Affected:
Encoding:
Description:
Words:
Cycles:
Example 1:
Example 2:
Example 3:
Subtract W from Literal
[ label ] SUBLW k
0 ≤ k ≤ 255
k - (W) → (W)
C, DC, Z
11
110x kkkk kkkk
The W register is subtracted (2’s
complement method) from the eight-
bit literal ‘k’. The result is placed in
the W register.
1
1
SUBLW 0x02
Before Instruction
W=1
C =?
After Instruction
W= 1
C = 1; result is positive
Before Instruction
W= 2
C=?
After Instruction
W= 0
C = 1; result is zero
Before Instruction
W= 3
C= ?
After Instruction
W = 0xFF
C = 0; result is negative
DS40044D-page 126
© 2005 Microchip Technology Inc.