PIC16F-ESLASHML datasheet(123/178 Pages) MICROCHIP

123 / 178 page

DS40044F-page 121

PIC16F627A/628A/648A

DECFSZ

Decrement f, Skip if 0

Syntax:

[ label ] DECFSZ f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (dest);

skip if result =

Status Affected:

None

Encoding:

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:

Cycles:

1(2)

Example

HERE

DECFSZ

REG1, 1

GOTO

LOOP

CONTINUE •

•

Before Instruction

= address HERE

After Instruction

REG1

= REG1 - 1

if REG1 = 0,

= address CONTINUE

if REG1

≠ 0,

= address HERE+1

GOTO

Unconditional Branch

Syntax:

[ label ]

GOTO k

Operands:

≤ k ≤ 2047

Operation:

→ PC<10:0>

PCLATH<4:3>

→ PC<12:11>

Status Affected:

None

Encoding:

1kkk

kkkk

Description:

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.

Words:

Cycles:

Example

GOTO THERE

After Instruction

PC = Address THERE

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