PIC18F1230 MICROCHIP [Microchip Technology], PIC18F1230 Datasheet - Page 240
![no-image](/images/no-image-200.jpg)
PIC18F1230
Manufacturer Part Number
PIC18F1230
Description
18/20/28-Pin, Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F1230.pdf
(312 pages)
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PIC18F1230/1330
RETFIE
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39758B-page 238
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
(TOS)
1
if s = 1
(WS)
(STATUSS)
(BSRS)
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
[0,1]
GIE/GIEH or PEIE/GIEL
W,
PC,
1
BSR,
0000
=
=
=
=
=
operation
operation
STATUS,
Q3
No
No
TOS
WS
BSRS
STATUSS
1
0001
Set GIEH or
Advance Information
from stack
operation
POP PC
GIEL
Q4
No
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
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
(TOS)
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
k
W,
© 2006 Microchip Technology Inc.
255
PC,
1100
operation
Process
Data
Q3
No
kkkk
from stack,
Write to W
operation
POP PC
Q4
No
kkkk
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