PIC16F84A-04B/SS 查看數據表（PDF） - Microchip Technology

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PIC16F84A-04B/SS

18-pin Flash/EEPROM 8-Bit Microcontrollers

Microchip Technology 

PIC16F8X

BCF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Bit Clear f

[label] BCF f,b

0 ≤ f ≤ 127

0≤b≤7

0 → (f<b>)

None

01 00bb bfff ffff

Bit 'b' in register 'f' is cleared.

1

1

Q1

Q2

Q3

Q4

Decode

Read

register

'f'

Process Write

data register 'f'

Example

BCF

FLAG_REG, 7

Before Instruction

FLAG_REG = 0xC7

After Instruction

FLAG_REG = 0x47

BSF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Bit Set f

[label] BSF f,b

0 ≤ f ≤ 127

0≤b≤7

1 → (f<b>)

None

01 01bb bfff ffff

Bit 'b' in register 'f' is set.

1

1

Q1

Q2

Q3

Q4

Decode

Read

register

'f'

Process Write

data register 'f'

Example

BSF

FLAG_REG, 7

Before Instruction

FLAG_REG = 0x0A

After Instruction

FLAG_REG = 0x8A

DS30430C-page 56

BTFSC

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Bit Test, Skip if Clear

[label] BTFSC f,b

0 ≤ f ≤ 127

0≤b≤7

skip if (f<b>) = 0

None

01

10bb

bfff ffff

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

instruction is executed.

If bit 'b', in register 'f', is '0' then the next

instruction is discarded, and a NOP is

executed instead, making this a 2TCY

instruction.

1

1(2)

Q1

Q2

Q3

Q4

Decode

Read

Process No-Operat

register 'f' data

ion

If Skip:

(2nd Cycle)

Q1

Q2

Q3

Q4

No-Operati No-Opera No-Operat

No-Operat

on

tion

ion

ion

Example

HERE

FALSE

TRUE

BTFSC

GOTO

•

•

•

FLAG,1

PROCESS_CODE

Before Instruction

PC = address HERE

After Instruction

if FLAG<1> = 0,

PC = address TRUE

if FLAG<1>=1,

PC = address FALSE

© 1998 Microchip Technology Inc.

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