PIC16C71 datasheet(80/176 Pages) MICROCHIP

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PIC16C71X

DS30272A-page 80

RETLW

Return with Literal in W

Syntax:

[

label ]

RETLW k

Operands:

≤ k ≤ 255

Operation:

→ (W);

TOS

→ PC

Status Affected:

None

Encoding:

01xx

kkkk

Description:

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.

Words:

Cycles:

Q Cycle Activity:

1st Cycle

Decode

Read

literal 'k'

NOP

Write to

W, Pop

from the

Stack

2nd Cycle

NOP

Example

TABLE

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

0x07

After Instruction

value of k8

RETURN

Return from Subroutine

Syntax:

[

label ]

RETURN

Operands:

None

Operation:

TOS

→ PC

Status Affected:

None

Encoding:

0000

1000

Description:

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.

Words:

Cycles:

Q Cycle Activity:

1st Cycle

Decode

NOP

Pop from

the Stack

2nd Cycle

NOP

Example

RETURN

After Interrupt

PC =

TOS

PIC16C71 Datasheet(PDF) 80 Page - Microchip Technology

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