PIC16C58BT datasheet(54/194 Pages) MICROCHIP

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PIC16C5X

DS30453D-page 52

Preliminary

BSF

Bit Set f

Syntax:

[

label ] BSF

f,b

Operands:

≤ f ≤ 31

≤ b ≤ 7

Operation:

→ (f<b>)

Status Affected:

None

Encoding:

0101

bbbf

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 f, Skip if Clear

Syntax:

[

label ] BTFSC f,b

Operands:

≤ f ≤ 31

≤ b ≤ 7

Operation:

skip if (f<b>) = 0

Status Affected:

None

Encoding:

0110

bbbf

ffff

Description:

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

next instruction is skipped.

If bit ’b’ is 0 then the next instruc-

tion fetched during the current

instruction execution is discarded,

and a NOP is executed instead,

making this a 2-cycle instruction.

Words:

Cycles:

1(2)

Example:

HERE

FALSE

TRUE

BTFSC

GOTO

•

FLAG,1

PROCESS_CODE

Before Instruction

= address (HERE)

After Instruction

if FLAG<1>

= 0,

= address (TRUE);

if FLAG<1>

= 1,

= address(FALSE)

BTFSS

Bit Test f, Skip if Set

Syntax:

[

label ] BTFSS f,b

Operands:

≤ f ≤ 31

≤ b < 7

Operation:

skip if (f<b>) = 1

Status Affected:

None

Encoding:

0111

bbbf

ffff

Description:

If bit ’b’ in register ’f’ is ’1’ then the

next instruction is skipped.

If bit ’b’ is ’1’, then the next instruc-

tion fetched during the current

instruction execution, is discarded

and a NOP is executed instead,

making this a 2-cycle instruction.

Words:

Cycles:

1(2)

Example:

HERE

BTFSS

FLAG,1

FALSE

GOTO

PROCESS_CODE

TRUE

•

Before Instruction

address (HERE)

After Instruction

If FLAG<1>

address (FALSE);

if FLAG<1>

address (TRUE)

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