16F628 datasheet(116/168 Pages) MICROCHIP

116 / 168 page

PIC16F627A/628A/648A

DS40044A-page 114

Preliminary

 2002 Microchip Technology Inc.

BCF

Bit Clear f

Syntax:

[

label ] BCF

f,b

Operands:

≤ f ≤ 127

≤ b ≤ 7

Operation:

→ (f<b>)

Status Affected:

None

Encoding:

00bb

bfff

ffff

Description:

Bit 'b' in register 'f' is cleared

Words:

Cycles:

Example

BCF

REG1, 7

Before Instruction

REG1

= 0xC7

After Instruction

REG1

= 0x47

BSF

Bit Set f

Syntax:

[

label ] BSF f,b

Operands:

≤ f ≤ 127

≤ b ≤ 7

Operation:

→ (f<b>)

Status Affected:

None

Encoding:

01bb

bfff

ffff

Description:

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

Words:

Cycles:

Example

BSF

REG1, 7

Before Instruction

REG1

= 0x0A

After Instruction

REG1

= 0x8A

BTFSC

Bit Test f, Skip if Clear

Syntax:

[

label ] BTFSC f,b

Operands:

≤ f ≤ 127

≤ b ≤ 7

Operation:

skip if (f<b>) = 0

Status Affected:

None

Encoding:

10bb

bfff

ffff

Description:

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

next instruction is skipped.

If bit 'b' is '0' then the next instruction

fetched during the current instruction

execution is discarded, and a NOP is

executed instead, making this a two-

cycle instruction

Words:

Cycles:

1(2)

Example

HERE

FALSE

TRUE

BTFSC

GOTO

•

REG1

PROCESS_CODE

Before Instruction

PC = address

HERE

After Instruction

if REG<1> = 0,

PC = address

TRUE

if REG<1>=1,

PC = address

FALSE

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