PIC16F636T-I/SL(2005) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F636T-I/SL
(Rev.:2005)

8/14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC12F635/PIC16F636/639

RETFIE

Return from Interrupt

Syntax:

[ label ] RETFIE

Operands:

None

Operation:

TOS → PC,

1 → GIE

Status Affected: None

Encoding:

00

0000 0000 1001

Description:

Return from interrupt. Stack is POPed

and Top-of-Stack (TOS) is loaded in

the PC. Interrupts are enabled by

setting the Global Interrupt Enable bit,

GIE (INTCON<7>). This is a

two-cycle instruction.

Words:

1

Cycles:

2

Example:

RETFIE

After Interrupt

PC = TOS

GIE = 1

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

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

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.

RLF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Rotate Left f through Carry

[ label ] RLF f,d

0 ≤ f ≤ 127

d ∈ [0,1]

See description below

C

00

1101 dfff ffff

The contents of register ‘f’ are

rotated one bit to the left through

the CARRY flag. If ‘d’ is ‘0’, the

result is placed in the W register.

If ‘d’ is ‘1’, the result is stored

back in register ‘f’.

C

Register f

Words:

Cycles:

Example:

1

1

RLF

REG1,0

Before Instruction

REG1 =

C

=

After Instruction

REG1 =

W

=

C

=

1110 0110

0

1110 0110

1100 1100

1

© 2005 Microchip Technology Inc.

Preliminary

DS41232B-page 137

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