PIC16F-ESLASHML datasheet(120/178 Pages) MICROCHIP

120 / 178 page

PIC16F627A/628A/648A

DS40044F-page 118

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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