12F629 datasheet(74/136 Pages) MICROCHIP

74 / 136 page

PIC12F629/675

DS41190G-page 74

 2010 Microchip Technology Inc.

BTFSC

Bit Test, Skip if Clear

Syntax:

[label] BTFSC f,b

Operands:

 f  127

 b  7

Operation:

skip if (f<b>) = 0

Status Affected:

None

Description:

If bit ‘b’ in register ‘f’ is ‘1’, the next

instruction is executed.

If bit ‘b’, in register ‘f’, is ‘0’, the

next instruction is discarded, and

a NOP is executed instead, making

this a 2TCY instruction.

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 immedi-

ate 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 f

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 register ‘f’.

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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