PIC16F720-EML データシートの表示（PDF） - Microchip Technology

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PIC16F720-EML

20-Pin Flash Microcontrollers

Microchip Technology 

PIC16(L)F720/721

RETFIE

Syntax:

Operands:

Operation:

Status Affected:

Description:

Words:

Cycles:

Example:

Return from Interrupt

[ label ] RETFIE

None

TOS  PC,

1  GIE

None

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 two-cycle

instruction.

1

2

RETFIE

After Interrupt

PC =

GIE =

TOS

1

RETLW

Syntax:

Operands:

Operation:

Status Affected:

Description:

Words:

Cycles:

Example:

TABLE

Return with literal in W

[ label ] RETLW k

0  k  255

k  (W);

TOS  PC

None

The W register is loaded with the

eight bit literal ‘k’. The program

counter is loaded from the top of

the stack (the return address).

This is a two-cycle instruction.

1

2

CALL TABLE;W contains

table

;offset value

• ;W now has table value

•

•

ADDWF PC ;W = offset

RETLW k1 ;Begin table

RETLW k2 ;

•

•

•

RETLW kn ; End of table

Before Instruction

W = 0x07

After Instruction

W = value of k8

RETURN

Syntax:

Operands:

Operation:

Status Affected:

Description:

Return from Subroutine

[ label ] RETURN

None

TOS  PC

None

Return from subroutine. The stack

is POPed and the top of the stack

(TOS) is loaded into the program

counter. This is a two-cycle

instruction.

 2010-2013 Microchip Technology Inc.

DS41430D-page 177

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