Datasheet

PIC16C55X
DS40143E-page 62 Preliminary  1996-2013 Microchip Technology Inc.
RETFIE Return from Interrupt
Syntax: [ label ] RETFIE
Operands: None
Operation: TOS  PC,
1  GIE
Status Affected: None
Encoding:
00 0000 0000 1001
Description:
Return from Interrupt. Stack is POPed
and Top of Stack (TOS) is loaded in
the PC. Interrupts are enabled by
setting Global Interrupt Enable bit,
GIE (INTCON<7>). This is a two-cycle
instruction.
Words: 1
Cycles: 2
Example
RETFIE
After Interrupt
PC = TOS
GIE = 1
RETLW Return with Literal in W
Syntax: [ label ] RETLW k
Operands: 0  k  255
Operation: k  (W);
TOS  PC
Status Affected: None
Encoding:
11 01xx kkkk kkkk
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.
Words: 1
Cycles: 2
Example
TABLE
CALL TABLE;W contains table
;offset value
•;W now has table
value
•
•
ADDWF PC ;W = offset
RETLW k1 ;Begin table
RETLW k2 ;
•
•
•
RETLW kn ; End of table
Before Instruction
W = 0x07
After Instruction
W = value of k8
RETURN Return from Subroutine
Syntax: [ label ] RETURN
Operands: None
Operation: TOS  PC
Status Affected: None
Encoding:
00 0000 0000 1000
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.
Words: 1
Cycles: 2
Example
RETURN
After Interrupt
PC = TOS
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
Encoding:
00 1101 dfff ffff
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'
.
Words: 1
Cycles: 1
Example
RLF REG1,0
Before Instruction
REG1 = 1110 0110
C =0
After Instruction
REG1 = 1110 0110
W = 1100 1100
C =1
Register fC