16F628 datasheet(124/168 Pages) MICROCHIP

124 / 168 page

PIC16F627A/628A/648A

DS40044A-page 122

Preliminary

 2002 Microchip Technology Inc.

RRF

Rotate Right f through Carry

Syntax:

[

label ] RRF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

See description below

Status Affected:

Encoding:

1100

dfff

ffff

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 reg-

ister. If 'd' is 1 the result is

placed back in register 'f'.

Words:

Cycles:

Example

RRF

REG1, 0

Before Instruction

REG1

= 1110 0110

After Instruction

REG1

= 1110 0110

= 0111 0011

SLEEP

Syntax:

[

label ] SLEEP

Operands:

None

Operation:

00h

→ WDT,

→ WDT prescaler,

→ TO,

→ PD

Status Affected:

TO, PD

Encoding:

0000

0110

0011

Description:

The power-down STATUS bit,

PD is cleared. Time out STA-

TUS bit, TO is set. Watchdog

Timer and its prescaler are

cleared.

The processor is put into

SLEEP mode with the oscilla-

tor stopped. See Section 14.8

for more details.

Words:

Cycles:

Example:

SLEEP

SUBLW

Subtract W from Literal

Syntax:

[

label ]

SUBLW k

Operands:

≤ k ≤ 255

Operation:

k - (W)

→ (W)

Status

Affected:

C, DC, Z

Encoding:

110x

kkkk

Description:

The W register is subtracted (2’s

complement method) from the eight

bit literal 'k'. The result is placed in

the W register.

Words:

Cycles:

Example 1:

SUBLW

0x02

Before Instruction

W= 1

C= ?

After Instruction

W= 1

C = 1; result is positive

Example 2:

Before Instruction

W= 2

C= ?

After Instruction

W= 0

C = 1; result is zero

Example 3:

Before Instruction

After Instruction

0xFF

C =

0; result is negative

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