Datasheet

 2001-2013 Microchip Technology Inc. DS39598F-page 109
PIC16F818/819
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’ = 0, the result
is placed in the W register. If
‘d’ = 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’ = 0, the result
is placed in the W register. If
‘d’ = 1, the result is placed back in
register ‘f’.
SLEEP
Enter Sleep mode
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.
Register fC
Register fC