P12C508 datasheet(40/84 Pages) MICROCHIP

40 / 84 page

PIC12C5XX

DS40139A-page 40

Advanced Information

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 instruction

fetched during the current instruction

execution is discarded, and an 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>

address (TRUE);

if FLAG<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 instruction

fetched during the current instruction

execution, is discarded and an 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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