PIC16LC554 datasheet(54/96 Pages) MICROCHIP

54 / 96 page

PIC16C55X(A)

DS40143B-page 54

Preliminary

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

FLAG_REG, 7

Before Instruction

FLAG_REG = 0xC7

After Instruction

FLAG_REG = 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

FLAG_REG,

Before Instruction

FLAG_REG = 0x0A

After Instruction

FLAG_REG = 0x8A

BTFSC

Bit Test, 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

•

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

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