PIC16C558A-04I 查看數據表（PDF） - Microchip Technology

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PIC16C558A-04I

ERROM-based 8-Bit CMOS microcontroller

Microchip Technology 

PIC16C55X

BTFSS

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Bit Test f, Skip if Set

[ label ] BTFSS f,b

0 ≤ f ≤ 127

0≤b<7

skip if (f<b>) = 1

None

01

11bb bfff ffff

If bit 'b' in register 'f' is '1' then the next

instruction is skipped.

If bit 'b' is '1', then the next instruction

fetched during the current instruction

execution, is discarded and a NOP is

executed instead, making this a two-

cycle instruction.

1

1(2)

HERE

FALSE

TRUE

BTFSS

GOTO

•

•

•

FLAG,1

PROCESS_CODE

Before Instruction

PC = address HERE

After Instruction

if FLAG<1> = 0,

PC = address FALSE

if FLAG<1> = 1,

PC = address TRUE

CALL

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Call Subroutine

[ label ] CALL k

0 ≤ k ≤ 2047

(PC)+ 1→ TOS,

k → PC<10:0>,

(PCLATH<4:3>) → PC<12:11>

None

10

0kkk kkkk kkkk

Call Subroutine. First, return address

(PC+1) is pushed onto the stack. The

eleven bit immediate address is

loaded into PC bits <10:0>. The upper

bits of the PC are loaded from

PCLATH. CALL is a two-cycle instruc-

tion.

1

2

HERE CALL THERE

Before Instruction

PC = Address HERE

After Instruction

PC = Address THERE

TOS = Address HERE+1

CLRF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Clear f

[ label ] CLRF f

0 ≤ f ≤ 127

00h → (f)

1→Z

Z

00

0001 1fff ffff

The contents of register 'f' are cleared

and the Z bit is set.

1

1

CLRF FLAG_REG

Before Instruction

FLAG_REG=0x5A

After Instruction

FLAG_REG=0x00

Z

=1

 2002 Microchip Technology Inc.

Preliminary

DS40143D-page 57

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