PIC16F57T-I/SO(2004) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F57T-I/SO
(Rev.:2004)

Flash-Based, 8-Bit CMOS Microcontroller Series

Microchip Technology 

PIC16F5X

COMF

Complement f

Syntax:

[ label ] COMF f, d

Operands:

0 ≤ f ≤ 31

d ∈ [0,1]

Operation:

(f) → (dest)

Status Affected: Z

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

register ‘f’.

Words:

1

Cycles:

1

Example:

COMF REG1,0

Before Instruction

REG1 =

After Instruction

REG1 =

W

=

0x13

0x13

0xEC

DECF

Decrement f

Syntax:

[ label ] DECF f, d

Operands:

0 ≤ f ≤ 31

d ∈ [0,1]

Operation:

(f) – 1 → (dest)

Status Affected: Z

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 register ‘f’.

Words:

1

Cycles:

1

Example:

DECF CNT, 1

Before Instruction

CNT

=

Z

=

After Instruction

CNT

=

Z

=

0x01

0

0x00

1

DECFSZ

Decrement f, Skip if 0

Syntax:

[ label ] DECFSZ f, d

Operands:

0 ≤ f ≤ 31

d ∈ [0,1]

Operation:

(f) – 1 → d; skip if result = 0

Status Affected: None

Encoding:

0010 11df ffff

Description:

The contents of register ‘f’ are

decremented. If ‘d’ is ‘0’, the result

is placed in the W register. If ‘d’ is

‘1’. the result is placed back in

register ‘f’. If the result is ‘0’, the

next instruction, which is already

fetched, is discarded and a NOP is

executed instead making it a

two-cycle instruction.

Words:

1

Cycles:

1(2)

Example:

HERE

DECFSZ

GOTO

CONTINUE •

•

•

CNT, 1

LOOP

Before Instruction

PC

=

After Instruction

CNT

=

if CNT =

PC

=

if CNT ≠

PC

=

address(HERE)

CNT - 1;

0,

address (CONTINUE);

0,

address (HERE+1)

DS41213C-page 46

 2004 Microchip Technology Inc.

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