PIC16LC924-08/CL データシートの表示（PDF） - Microchip Technology

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PIC16LC924-08/CL

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

DECFSZ

Decrement f, Skip if 0

Syntax:

[ label ] DECFSZ f,d

Operands:

Operation:

0 ≤ f ≤ 127

d ∈ [0,1]

(f) - 1 → (destination);

skip if result = 0

Status Affected: None

Encoding:

00

1011 dfff ffff

Description:

Words:

The contents of register 'f' are decre-

mented. 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 1, the next instruction, is

executed. If the result is 0, then a NOP is

executed instead making it a 2TCY instruc-

tion.

1

Cycles:

1(2)

Q Cycle Activity:

Q1

Q2

Q3

Q4

Decode Read Process Write to

register 'f' data destination

If Skip: (2nd Cycle)

Q1

Q2

Q3

Q4

No-

No-

No-

No-

Operation Operation Operation Operation

Example

HERE

DECFSZ

GOTO

CONTINUE •

•

•

CNT, 1

LOOP

Before Instruction

PC = address HERE

After Instruction

CNT = CNT - 1

if CNT = 0,

PC = address CONTINUE

if CNT ≠ 0,

PC = address HERE+1

GOTO

Unconditional Branch

Syntax:

[ label ] GOTO k

Operands:

0 ≤ k ≤ 2047

Operation:

k → PC<10:0>

PCLATH<4:3> → PC<12:11>

Status Affected: None

Encoding:

10 1kkk kkkk kkkk

Description:

GOTO is an unconditional branch. The

eleven bit immediate 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:

1

Cycles:

2

Q Cycle Activity:

Q1

Q2

Q3

Q4

1st Cycle Decode Read Process Write to

literal 'k' data

PC

2nd Cycle No-

No-

No-

No-

Operation Operation Operation Operation

Example

GOTO THERE

After Instruction

PC = Address THERE

© 1997 Microchip Technology Inc.

DS30444E - page 127

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