2010-2012 Microchip Technology Inc.
DS41417B-page 191
PIC16(L)F722A/723A
RETFIE
Return from Interrupt
Syntax:
[ label ] RETFIE
Operands:
None
Operation:
TOS
PC,
1 GIE
Status Affected:
None
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
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
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.
