PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 466

• Manufacturer Part Number: PIC18F25J50
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F46J50 FAMILY
RETFIE
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39931D-page 466
Q Cycle Activity:
After Interrupt
operation
Decode
PC
W
BSR
STATUS
GIE/GIEH, PEIE/GIEL
No
Q1
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
No
No
Q2
1
0000
operation
operation
=
=
=
=
=
No
No
Q3
TOS
WS
BSRS
STATUSS
1
0001
Set GIEH or
from stack
operation
POP PC
GIEL
No
Q4
000s
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
No
Q1
; 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
No
Q2
07h
value of kn
 2011 Microchip Technology Inc.
1100
operation
Process
Data
No
Q3
kkkk
from stack,
write to W
operation
POP PC
No
Q4
kkkk