PIC12CR509AT-04 查看數據表（PDF） - Microchip Technology

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PIC12CR509AT-04

8-Pin, 8-Bit CMOS Microcontrollers

Microchip Technology 

CALL

Subroutine Call

Syntax:

[ label ] CALL k

Operands:

0 ≤ k ≤ 255

Operation:

(PC) + 1→ Top of Stack;

k → PC<7:0>;

(STATUS<6:5>) → PC<10:9>;

0 → PC<8>

Status Affected: None

Encoding:

1001 kkkk 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:

1

Cycles:

2

Example:

HERE CALL THERE

Before Instruction

PC = address (HERE)

After Instruction

PC = address (THERE)

TOS = address (HERE + 1)

CLRF

Clear f

Syntax:

[ label ] CLRF f

Operands:

0 ≤ f ≤ 31

Operation:

00h → (f);

1→Z

Status Affected: Z

Encoding:

0000 011f ffff

Description:

The contents of register ’f’ are cleared

and the Z bit is set.

Words:

1

Cycles:

1

Example:

CLRF FLAG_REG

Before Instruction

FLAG_REG = 0x5A

After Instruction

FLAG_REG =

Z

=

0x00

1

PIC12C5XX

CLRW

Clear W

Syntax:

[ label ] CLRW

Operands:

None

Operation:

00h → (W);

1→Z

Status Affected: Z

Encoding:

0000 0100 0000

Description:

The W register is cleared. Zero bit (Z)

is set.

Words:

1

Cycles:

1

Example:

CLRW

Before Instruction

W = 0x5A

After Instruction

W = 0x00

Z=1

CLRWDT

Clear Watchdog Timer

Syntax:

[ label ] CLRWDT

Operands:

None

Operation:

00h → WDT;

0 → WDT prescaler (if assigned);

1 → TO;

1 → PD

Status Affected: TO, PD

Encoding:

0000 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:

1

Cycles:

1

Example:

CLRWDT

Before Instruction

WDT counter = ?

After Instruction

WDT counter =

WDT prescale =

TO

=

PD

=

0x00

0

1

1

© 1999 Microchip Technology Inc.

DS40139E-page 51

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