
PIC16CE62X
DS40182A-page 74
Preliminary
1998 Microchip Technology Inc.
RETURN
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Return from Subroutine
[ label RETURN
None
TOS
→
PC
None
00
0000
0000
1000
Return from subroutine. The stack is
POPed and the top of the stack (TOS)
is loaded into the program counter.
This is a two cycle instruction.
1
2
Words:
Cycles:
Example
RETURN
After Interrupt
PC =
TOS
RLF
Syntax:
Operands:
Rotate Left f through Carry
[ label
RLF f,d
0
≤
f
≤
127
d
∈
[0,1]
See description below
C
Operation:
Status Affected:
Encoding:
Description:
00
1101
dfff
ffff
The contents of register 'f' are rotated
one bit to the left through the Carry
Flag. If 'd' is 0 the result is placed in
the W register. If 'd' is 1 the result is
stored back in register 'f'.
Register f
C
Words:
Cycles:
Example
1
1
RLF
REG1,0
Before Instruction
REG1
C
=
=
1110 0110
0
After Instruction
REG1
W
C
=
=
=
1110 0110
1100 1100
1
RRF
Syntax:
Operands:
Rotate Right f through Carry
[ label RRF f,d
0
≤
f
≤
127
d
∈
[0,1]
See description below
C
Operation:
Status Affected:
Encoding:
Description:
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'.
Words:
Cycles:
Example
1
1
RRF
REG1,0
Before Instruction
REG1
C
=
=
1110 0110
0
After Instruction
REG1
W
C
=
=
=
1110 0110
0111 0011
0
SLEEP
Syntax:
Operands:
Operation:
[ label
None
00h
→
WDT,
0
→
WDT prescaler,
1
→
TO,
0
→
PD
TO, PD
SLEEP
Status Affected:
Encoding:
Description:
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 10.8 for more details.
1
1
Words:
Cycles:
Example:
SLEEP
Register f
C