PIC16F876ATISLASHML datasheet(164/234 Pages) MICROCHIP

164 / 234 page

PIC16F87XA

DS39582B-page 162

 2003 Microchip Technology Inc.

CALL

Call Subroutine

Syntax:

[ label ] CALL k

Operands:

≤ k ≤ 2047

Operation:

(PC)+ 1

→ TOS,

→ PC<10:0>,

(PCLATH<4:3>)

→ PC<12:11>

Status Affected:

None

Description:

Call Subroutine. First, return

address (PC+1) is pushed onto

the stack. The eleven-bit

immediate address is loaded into

PC bits <10:0>. The upper bits of

the PC are loaded from PCLATH.

CALL

is a two-cycle instruction.

CLRF

Clear f

Syntax:

[ label ] CLRF

Operands:

≤ f ≤ 127

Operation:

00h

→ (f)

→ Z

Status Affected:

Description:

The contents of register ‘f’ are

cleared and the Z bit is set.

CLRW

Clear W

Syntax:

[ label ] CLRW

Operands:

None

Operation:

00h

→ (W)

→ Z

Status Affected:

Description:

W register is cleared. Zero bit (Z)

is set.

CLRWDT

Clear Watchdog Timer

Syntax:

[ label ] CLRWDT

Operands:

None

Operation:

00h

→ WDT

→ WDT prescaler,

→ TO

→ PD

Status Affected:

TO, PD

Description:

CLRWDT

instruction resets the

Watchdog Timer. It also resets the

prescaler of the WDT. Status bits,

TO and PD, are set.

COMF

Complement f

Syntax:

[ label ] COMF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f)

→ (destination)

Status Affected:

Description:

The contents of register ‘f’ are

complemented. If ‘d’ is ‘0’, the

result is stored in W. If ‘d’ is ‘1’,

the result is stored back in

DECF

Decrement f

Syntax:

[ label ] DECF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (destination)

Status Affected:

Description:

Decrement register ‘f’. If ‘d’ is ‘0’,

the result is stored in the W

stored back in register ‘f’.

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