PIC16F753 datasheet(146/230 Pages) MICROCHIP

146 / 230 page

PIC16F753/HV753

DS40001709C-page 146

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RETFIE

Return from Interrupt

Syntax:

[ label ]

RETFIE

Operands:

None

Operation:

TOS

 PC,

 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 2-cycle

instruction.

Words:

Cycles:

Example:

RETFIE

After Interrupt

PC =

TOS

GIE =

RETLW

Return with literal in W

Syntax:

[ label ]

RETLW k

Operands:

 k  255

Operation:

 (W);

TOS

 PC

Status Affected:

None

Description:

The W register is loaded with the

8-bit literal ‘k’. The program

counter is loaded from the top of

the stack (the return address).

This is a 2-cycle instruction.

Words:

Cycles:

Example:

TABLE

DONE

CALL TABLE;W contains

;table offset

;value

GOTO DONE

•

ADDWF PC

;W = offset

RETLW k1

;Begin table

RETLW k2

;

•

RETLW kn

;End of table

Before Instruction

0x07

After Instruction

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 2-cycle instruc-

tion.

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