PIC16C71 datasheet(146/337 Pages) MICROCHIP

146 / 337 page

PIC16C6X

DS30234D-page 146

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:

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write

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:

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write

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 '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

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

Process

data

No-

Operation

If Skip:

(2nd Cycle)

No-

Operation

No-

Operation

No-

Operation

No-

Operation

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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