PIC16F870SLASHP datasheet(111/156 Pages) MICROCHIP

111 / 156 page

Preliminary

DS30569A-page 111

PIC16F870/871

RETFIE

Return from Interrupt

Syntax:

[

label ]

RETFIE

Operands:

None

Operation:

TOS

→ PC,

→ GIE

Status Affected:

None

RETLW

Return with Literal in W

Syntax:

[

label ]

RETLW k

Operands:

≤ k ≤ 255

Operation:

→ (W);

TOS

→ PC

Status Affected:

None

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.

RETURN

Return from Subroutine

Syntax:

[

label ]

RETURN

Operands:

None

Operation:

TOS

→ PC

Status Affected:

None

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.

RLF

Rotate Left f through Carry

Syntax:

[

label ]

RLF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

See description below

Status Affected:

Description:

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’.

RRF

Rotate Right f through Carry

Syntax:

[

label ]

RRF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

See description below

Status Affected:

Description:

The contents of register ’f’ are

rotated one bit to the right through

the Carry Flag. If ’d’ is 0, the result

is placed in the W register. If ’d’ is

1, the result is placed back in reg-

ister ’f’.

SLEEP

Syntax:

[

label

]

SLEEP

Operands:

None

Operation:

00h

→ WDT,

→ WDT prescaler,

→ TO,

→ PD

Status Affected:

TO, PD

Description:

The power-down status bit, PD is

cleared. Time-out status bit, TO

is set. Watchdog Timer and its

prescaler are cleared.

The processor is put into SLEEP

mode with the oscillator stopped.

PIC16F870/P Datasheet(PDF) 111 Page - Microchip Technology

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