PIC16F627A Datasheet, PDF (124/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

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 reg-
ister. 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 STA-
TUS bit, TO is set. Watchdog
Timer and its prescaler are
cleared.
The processor is put into
SLEEP mode with the oscilla-
tor stopped. See Section 14.8
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
DS40044A-page 122
Preliminary
 2002 Microchip Technology Inc.