OPTION_REG datasheet(194/222 Pages) MICROCHIP

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MCP19111

DS22331A-page 194

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BTFSS

Bit Test f, Skip if Set

Syntax:

[ label ] BTFSS f,b

Operands:

 f  127

 b < 7

Operation:

skip if (f<b>) = 1

Status Affected:

None

Description:

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

instruction is executed.

If bit ‘b’ is ‘1’, then the next

instruction is discarded and a NOP

is executed instead, making this a

two-cycle 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

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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