PIC16F84A datasheet(40/88 Pages) MICROCHIP

40 / 88 page

PIC16F84A

DS35007B-page 38

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

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 regis-

ter. If ’d’ is 1, the result is stored

back in register ’f’.

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