PIC16F-ESLASHSS datasheet(128/178 Pages) MICROCHIP

128 / 178 page

PIC16F627A/628A/648A

DS40044F-page 126

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

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 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.

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 =

; result is negative

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