PIC16F84A datasheet(41/90 Pages) MICROCHIP

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DS35007C-page 41

PIC16F84A

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

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.

SUBLW

Subtract W from Literal

Syntax:

[ label ] SUBLW k

Operands:

k 255

Operation:

k - (W)

W)

Status Affected: C, DC, Z

Description:

The W register is subtracted (2’s

complement method) from the

eight-bit literal 'k'. The result is

placed in the W register.

SUBWF

Subtract W from f

Syntax:

[ label ] SUBWF f,d

Operands:

f 127

 [0,1]

Operation:

(f) - (W)

destination)

Status Affected: C, DC, Z

Description:

Subtract (2’s complement method)

W register from register 'f'. If 'd' is 0,

the result is stored in the W regis-

ter. If 'd' is 1, the result is stored

back in register 'f'.

SWAPF

Swap Nibbles in f

Syntax:

[ label ] SWAPF f,d

Operands:

 f  127

 [0,1]

Operation:

(f<3:0>)

 (destination<7:4>),

(f<7:4>)

 (destination<3:0>)

Status Affected:

None

Description:

The upper and lower nibbles of

0, the result is placed in W regis-

ter. If 'd' is 1, the result is placed in

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