PIC16C558T-04/SO 데이터 시트보기 (PDF) - Microchip Technology

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PIC16C558T-04/SO

ERROM-based 8-Bit CMOS microcontroller

Microchip Technology 

PIC16C55X

DECFSZ

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Decrement f, Skip if 0

[ label ] DECFSZ f,d

0 ≤ f ≤ 127

d ∈ [0,1]

(f) - 1 → (dest); skip if result = 0

None

00

1011 dfff ffff

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.

1

1(2)

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

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 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.

1

2

GOTO THERE

After Instruction

PC = Address THERE

INCF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Increment f

[ label ] INCF f,d

0 ≤ f ≤ 127

d ∈ [0,1]

(f) + 1 → (dest)

Z

00

1010 dfff ffff

The contents of register 'f' are

incremented. If 'd' is 0 the result is

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

result is placed back in register 'f'.

1

1

INCF CNT, 1

Before Instruction

CNT = 0xFF

Z =0

After Instruction

CNT = 0x00

Z =1

 2002 Microchip Technology Inc.

Preliminary

DS40143D-page 59

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