PIC16C56-XT datasheet(56/194 Pages) MICROCHIP

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PIC16C5X

DS30453D-page 54

Preliminary

COMF

Complement f

Syntax:

[

label ] COMF

f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f)

→ (dest)

Status Affected:

Encoding:

0010

01df

ffff

Description:

The contents of register ’f’ are

complemented. If ’d’ is 0 the result

is stored in the W register. If ’d’ is 1

the result is stored back in

Words:

Cycles:

Example:

COMF

REG1,0

Before Instruction

REG1

0x13

After Instruction

REG1

0x13

0xEC

DECF

Decrement f

Syntax:

[

label ] DECF f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f) – 1

→ (dest)

Status Affected:

Encoding:

0000

11df

ffff

Description:

Decrement register 'f'. If 'd' is 0 the

result is stored in the W register. If

'd' is 1 the result is stored back in

Words:

Cycles:

Example:

DECF

CNT,

Before Instruction

CNT

0x01

After Instruction

CNT

0x00

DECFSZ

Decrement f, Skip if 0

Syntax:

[

label ] DECFSZ f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f) – 1

→ d; skip if result = 0

Status Affected:

None

Encoding:

0010

11df

ffff

Description:

The contents of register 'f' are dec-

remented. If 'd' is 0 the result is

placed in the W register. If 'd' is 1

the result is placed back in

If the result is 0, the next instruc-

tion, which is already fetched, is

discarded and a NOP is executed

instead making it a two-cycle

instruction.

Words:

Cycles:

1(2)

Example:

HERE

DECFSZ

CNT, 1

GOTO

LOOP

CONTINUE •

•

Before Instruction

address(HERE)

After Instruction

CNT

CNT - 1;

if CNT

address (CONTINUE);

if CNT

≠

address (HERE+1)

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