PIC16F648AESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F648AESS

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

DECFSZ

Decrement f, Skip if 0

Syntax:

[ label ] DECFSZ f,d

Operands:

0 ≤ f ≤ 127

d ∈ [0,1]

Operation:

(f) - 1 → (dest); skip if result =

0

Status Affected: None

Encoding:

00

1011 dfff 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. A NOP is

executed instead making it a

two-cycle instruction.

Words:

1

Cycles:

1(2)

Example

HERE DECFSZ

GOTO

CONTINUE •

•

•

REG1, 1

LOOP

Before Instruction

PC

= address HERE

After Instruction

REG1 = REG1 - 1

if REG1 = 0,

PC = address CONTINUE

if REG1 ≠ 0,

PC = address HERE+1

GOTO

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Unconditional Branch

[ label ] GOTO k

0 ≤ k ≤ 2047

k → PC<10:0>

PCLATH<4:3> → PC<12:11>

None

10

1kkk kkkk kkkk

GOTO is an unconditional

branch. The eleven-bit immedi-

ate value is loaded into PC bits

<10:0>. The upper bits of PC

are loaded from PCLATH<4:3>.

GOTO is a two-cycle instruction.

1

2

GOTO THERE

After Instruction

PC = Address THERE

© 2007 Microchip Technology Inc.

DS40044F-page 121

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