PIC16F84A datasheet(39/88 Pages) MICROCHIP

39 / 88 page

DS35007B-page 37

PIC16F84A

7.1

Instruction Descriptions

ADDLW

Add Literal and W

Syntax:

[

label] ADDLW

Operands:

≤ k ≤ 255

Operation:

(W) + k

→ (W)

Status Affected:

C, DC, Z

Description:

The contents of the W register

are added to the eight-bit literal ’k’

and the result is placed in the W

ADDWF

Add W and f

Syntax:

[

label] ADDWF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(W) + (f)

→ (destination)

Status Affected:

C, DC, Z

Description:

Add the contents of the W register

with register ’f’. If ’d’ is 0, the result

is stored in the W register. If ’d’ is

1, the result is stored back in

ANDLW

AND Literal with W

Syntax:

[

label] ANDLW

Operands:

≤ k ≤ 255

Operation:

(W) .AND. (k)

→ (W)

Status Affected:

Description:

The contents of W register are

AND’ed with the eight-bit literal

'k'. The result is placed in the W

ANDWF

AND W with f

Syntax:

[

label] ANDWF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(W) .AND. (f)

→ (destination)

Status Affected:

Description:

AND the W register with register

'f'. If 'd' is 0, the result is stored in

the W register. If 'd' is 1, the result

is stored back in register 'f'.

BCF

Bit Clear f

Syntax:

[

label] BCF

f,b

Operands:

≤ f ≤ 127

≤ b ≤ 7

Operation:

→ (f<b>)

Status Affected:

None

Description:

Bit 'b' in register 'f' is cleared.

BSF

Bit Set f

Syntax:

[

label] BSF

f,b

Operands:

≤ f ≤ 127

≤ b ≤ 7

Operation:

→ (f<b>)

Status Affected:

None

Description:

Bit 'b' in register 'f' is set.

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 instruc-

tion is discarded and a NOP is exe-

cuted instead, making this a 2TCY

instruction.

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