PIC16F648AESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F648AESS

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

RRF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Rotate Right f through Carry

[ label ] RRF f,d

0 ≤ f ≤ 127

d ∈ [0,1]

See description below

C

00

1100 dfff ffff

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 register ‘f’.

C

REGISTER F

Words:

Cycles:

Example

1

1

RRF

REG1, 0

Before Instruction

REG1 = 1110 0110

C =0

After Instruction

REG1 = 1110 0110

W = 0111 0011

C =0

SLEEP

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example:

[ label ] SLEEP

None

00h → WDT,

0 → WDT prescaler,

1 → TO,

0 → PD

TO, PD

00

0000 0110 0011

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. See Section 14.8

“Power-Down Mode (Sleep)”

for more details.

1

1

SLEEP

SUBLW

Syntax:

Operands:

Operation:

Status

Affected:

Encoding:

Description:

Words:

Cycles:

Example 1:

Example 2:

Example 3:

Subtract W from Literal

[ label ] SUBLW k

0 ≤ k ≤ 255

k - (W) → (W)

C, DC, Z

11

110x kkkk kkkk

The W register is subtracted (2’s

complement method) from the eight-

bit literal ‘k’. The result is placed in

the W register.

1

1

SUBLW 0x02

Before Instruction

W=1

C =?

After Instruction

W= 1

C = 1; result is positive

Before Instruction

W= 2

C=?

After Instruction

W= 0

C = 1; result is zero

Before Instruction

W= 3

C= ?

After Instruction

W = 0xFF

C = 0; result is negative

DS40044F-page 126

© 2007 Microchip Technology Inc.

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