PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 340

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F/LF1XK50
RETFIE
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS41350E-page 340
Q Cycle Activity:
After Interrupt
operation
Decode
PC
W
BSR
Status
GIE/GIEH, PEIE/GIEL
Q1
No
operation
operation
Return from Interrupt
RETFIE {s}
s  [0,1]
(TOS)  PC,
1  GIE/GIEH or PEIE/GIEL,
if s = 1
(WS)  W,
(STATUSS)  Status,
(BSRS)  BSR,
PCLATU, PCLATH are unchanged.
GIE/GIEH, PEIE/GIEL.
Return from interrupt. Stack is popped
and Top-of-Stack (TOS) is loaded into
the PC. Interrupts are enabled by
setting either the high or low priority
global interrupt enable bit. If ‘s’ = 1, the
contents of the shadow registers, WS,
STATUSS and BSRS, are loaded into
their corresponding registers, W,
Status and BSR. If ‘s’ = 0, no update of
these registers occurs (default).
1
2
RETFIE
0000
Q2
No
No
1
0000
operation
operation
=
=
=
=
=
Q3
No
No
TOS
WS
BSRS
STATUSS
1
0001
Set GIEH or
from stack
operation
POP PC
GIEL
Q4
No
000s
Preliminary
RETLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
TABLE
Q Cycle Activity:
:
:
:
CALL TABLE ; W contains table
ADDWF PCL
RETLW k0
RETLW k1
RETLW kn
Before Instruction
After Instruction
operation
Decode
W
W
Q1
No
; offset value
; W now has
; table value
; W = offset
; Begin table
;
; End of table
=
=
operation
Return literal to W
RETLW k
0  k  255
k  W,
(TOS)  PC,
PCLATU, PCLATH are unchanged
None
W is loaded with the eight-bit literal ‘k’.
The program counter is loaded from the
top of the stack (the return address).
The high address latch (PCLATH)
remains unchanged.
1
2
literal ‘k’
Read
0000
Q2
No
07h
value of kn
 2010 Microchip Technology Inc.
1100
operation
Process
Data
Q3
No
kkkk
from stack,
Write to W
operation
POP PC
Q4
No
kkkk