P12C508 datasheet(46/84 Pages) MICROCHIP

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PIC12C5XX

DS40139A-page 46

Advanced Information

SLEEP

Enter SLEEP Mode

Syntax:

[

label]

SLEEP

Operands:

None

Operation:

00h

→ WDT;

→ WDT prescaler;

→ TO;

→ PD

Status Affected:

TO, PD, GPWUF

Encoding:

0000

0011

Description:

Time-out status bit (TO) is set. The

power down status bit (PD) is cleared.

GPWUF is unaffected.

The WDT and its prescaler are

cleared.

The processor is put into SLEEP mode

with the oscillator stopped. See sec-

tion on SLEEP for more details.

Words:

Cycles:

Example:

SLEEP

SUBWF

Subtract W from f

Syntax:

[

label]

SUBWF f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f) – (W)

→ (dest)

Status Affected:

C, DC, Z

Encoding:

0000

10df

ffff

Description:

Subtract (2’s complement method) the

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

result is stored in the W register. If 'd' is

1 the result is stored back in register 'f'.

Words:

Cycles:

Example 1:

SUBWF

REG1, 1

Before Instruction

REG1

After Instruction

REG1

; result is positive

Example 2:

Before Instruction

REG1

After Instruction

REG1

; result is zero

Example 3:

Before Instruction

REG1

After Instruction

REG1

; result is negative

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