PIC18F23K20-ESLASHML datasheet(346/456 Pages) MICROCHIP

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PIC18F2XK20/4XK20

DS41303G-page 346

 2010 Microchip Technology Inc.

RETFIE

Return from Interrupt

Syntax:

RETFIE {s}

Operands:

 [0,1]

Operation:

(TOS)

 PC,

 GIE/GIEH or PEIE/GIEL,

if s = 1

(WS)

 W,

(STATUSS)

 Status,

(BSRS)

 BSR,

PCLATU, PCLATH are unchanged.

Status Affected:

GIE/GIEH, PEIE/GIEL.

Encoding:

0000

0001

000s

Description:

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).

Words:

Cycles:

Q Cycle Activity:

Decode

operation

POP PC

from stack

Set GIEH or

GIEL

operation

Example:

RETFIE

After Interrupt

TOS

BSR

BSRS

Status

STATUSS

GIE/GIEH, PEIE/GIEL

RETLW

Return literal to W

Syntax:

RETLW k

Operands:

 k  255

Operation:

 W,

(TOS)

 PC,

PCLATU, PCLATH are unchanged

Status Affected:

None

Encoding:

0000

1100

kkkk

Description:

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.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

literal ‘k’

Process

Data

POP PC

from stack,

Write to W

operation

Example:

CALL TABLE ; W contains table

; offset value

; W now has

; table value

TABLE

ADDWF PCL

; W = offset

RETLW k0

; Begin table

RETLW k1

;

RETLW kn

; End of table

Before Instruction

07h

After Instruction

value of kn

PIC18F23K20-E/ML Datasheet(PDF) 346 Page - Microchip Technology

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