PIC16LC622T-20/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC622T-20/SS

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C62X

RETFIE

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Return from Interrupt

[ label ] RETFIE

None

TOS → PC,

1 → GIE

None

00

0000 0000 1001

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 = TOS

GIE = 1

RETLW

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

TABLE

Return with Literal in W

[ label ] RETLW k

0 ≤ k ≤ 255

k → (W);

TOS → PC

None

11

01xx kkkk kkkk

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:

Encoding:

Description:

Words:

Cycles:

Example

Return from Subroutine

[ label ] RETURN

None

TOS → PC

None

00

0000 0000 1000

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.

1

2

RETURN

After Interrupt

PC = TOS

DS30235J-page 70

 2003 Microchip Technology Inc.

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