PIC16C711-10ISP 查看數據表（PDF） - Microchip Technology

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PIC16C711-10ISP

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C71X

RETLW

Return with Literal in W

Syntax:

[ label ] RETLW k

Operands:

0 ≤ k ≤ 255

Operation:

k → (W);

TOS → PC

Status Affected: None

Encoding:

11 01xx kkkk 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:

1

Cycles:

2

Q Cycle Activity:

Q1

Q2 Q3

Q4

1st Cycle Decode Read

literal 'k'

NOP

Write to

W, Pop

from the

Stack

2nd Cycle NOP

NOP

NOP

NOP

Example

CALL TABLE ;W contains table

;offset value

•

;W now has table value

•

•

TABLE 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

Return from Subroutine

Syntax:

[ label ] RETURN

Operands:

None

Operation:

TOS → PC

Status Affected: None

Encoding:

00 0000 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:

1

Cycles:

2

Q Cycle Activity:

Q1

Q2 Q3

Q4

1st Cycle Decode NOP

NOP Pop from

the Stack

2nd Cycle NOP

NOP

NOP

NOP

Example

RETURN

After Interrupt

PC = TOS

DS30272A-page 80

© 1997 Microchip Technology Inc.

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