
2000 Microchip Technology Inc.
Preliminary
DS41124C-page 119
PIC16C745/765
RETFIE
Return from Interrupt
Syntax:
[ label ]
RETFIE
Operands:
None
Operation:
TOS
→ PC,
1
→ GIE
Status Affected:
None
RETLW
Return with Literal in W
Syntax:
[ label ]
RETLW k
Operands:
0
≤ k ≤ 255
Operation:
k
→ (W);
TOS
→ PC
Status Affected:
None
Description:
The W register is loaded with the
eight bit literal ’k’. The program
counter is loaded from the top of
the stack (the return address).
This is a two cycle instruction.
RETURN
Return from Subroutine
Syntax:
[ label ]
RETURN
Operands:
None
Operation:
TOS
→ PC
Status Affected:
None
Description:
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.
RLF
Rotate Left f through Carry
Syntax:
[ label ]
RLF
f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
See description below
Status Affected:
C
Description:
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’.
RRF
Rotate Right f through Carry
Syntax:
[ label ]
RRF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
See description below
Status Affected:
C
Description:
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 reg-
ister ’f’.
SLEEP
Syntax:
[ label
]
SLEEP
Operands:
None
Operation:
00h
→ WDT,
0
→ WDT prescaler,
1
→ TO,
0
→ PD
Status Affected:
TO, PD
Description:
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.
details.
Register f
C
Register f
C
745cov.book Page 119 Wednesday, August 2, 2000 8:24 AM