PIC16C925T-SSLASHCL datasheet(119/182 Pages) MICROCHIP

119 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 117

PIC16C925/926

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

Operation

If Skip:

(2nd Cycle)

Operation

Example

HERE

FALSE

TRUE

BTFSC

GOTO

•

FLAG,1

PROCESS_CODE

Before Instruction:

address HERE

After Instruction:

if FLAG<1> =

address TRUE

if FLAG<1> =

address FALSE

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