P12C508 datasheet(41/84 Pages) MICROCHIP

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DS40139A-page 41

PIC12C5XX

CALL

Subroutine Call

Syntax:

[

label ] CALL k

Operands:

≤ k ≤ 255

Operation:

(PC) + 1

→ Top of Stack;

→ PC<7:0>;

(STATUS<6:5>)

→ PC<10:9>;

→ PC<8>

Status Affected:

None

Encoding:

1001

kkkk

Description:

Subroutine call. First, return address

(PC+1) is pushed onto the stack. The

eight bit immediate address is loaded

into PC bits <7:0>. The upper bits

PC<10:9> are loaded from STA-

TUS<6:5>, PC<8> is cleared. CALL is a

two cycle instruction.

Words:

Cycles:

Example:

HERE

CALL

THERE

Before Instruction

PC =

address (HERE)

After Instruction

PC =

address (THERE)

TOS =

address (HERE + 1)

CLRF

Clear f

Syntax:

[

label ] CLRF

Operands:

≤ f ≤ 31

Operation:

00h

→ (f);

→ Z

Status Affected:

Encoding:

0000

011f

ffff

Description:

The contents of register 'f' are cleared

and the Z bit is set.

Words:

Cycles:

Example:

CLRF

FLAG_REG

Before Instruction

FLAG_REG

0x5A

After Instruction

FLAG_REG

0x00

CLRW

Clear W

Syntax:

[

label ] CLRW

Operands:

None

Operation:

00h

→ (W);

→ Z

Status Affected:

Encoding:

0000

0100

0000

Description:

The W register is cleared. Zero bit (Z)

is set.

Words:

Cycles:

Example:

CLRW

Before Instruction

0x5A

After Instruction

0x00

CLRWDT

Clear Watchdog Timer

Syntax:

[

label ] CLRWDT

Operands:

None

Operation:

00h

→ WDT;

→ WDT prescaler (if assigned);

→ TO;

→ PD

Status Affected:

TO, PD

Encoding:

0000

0100

Description:

The CLRWDT instruction resets the

WDT. It also resets the prescaler, if the

prescaler is assigned to the WDT and

not Timer0. Status bits TO and PD are

set.

Words:

Cycles:

Example:

CLRWDT

Before Instruction

WDT counter =

After Instruction

WDT counter =

0x00

WDT prescale =

P12C508 Datasheet(PDF) 41 Page - Microchip Technology

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