PIC12C509AT-04ESM データシートの表示（PDF） - Microchip Technology

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PIC12C509AT-04ESM

8-Pin, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12C5XX

BSF

Bit Set f

Syntax:

[ label ] BSF f,b

Operands:

0 ≤ f ≤ 31

0≤b≤7

Operation:

1 → (f<b>)

Status Affected: None

Encoding:

0101 bbbf ffff

Description:

Bit ’b’ in register ’f’ is set.

Words:

1

Cycles:

1

Example:

BSF

FLAG_REG, 7

Before Instruction

FLAG_REG = 0x0A

After Instruction

FLAG_REG = 0x8A

BTFSC

Bit Test f, Skip if Clear

Syntax:

[ label ] BTFSC f,b

Operands:

0 ≤ f ≤ 31

0≤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:

1

Cycles:

1(2)

Example:

HERE

FALSE

TRUE

BTFSC

GOTO

•

•

•

FLAG,1

PROCESS_CODE

Before Instruction

PC

= address (HERE)

After Instruction

if FLAG<1> =

PC

=

if FLAG<1> =

PC

=

0,

address (TRUE);

1,

address(FALSE)

BTFSS

Bit Test f, Skip if Set

Syntax:

[ label ] BTFSS f,b

Operands:

0 ≤ f ≤ 31

0≤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:

1

Cycles:

1(2)

Example:

HERE BTFSS

FALSE GOTO

TRUE •

•

•

FLAG,1

PROCESS_CODE

Before Instruction

PC

= address (HERE)

After Instruction

If FLAG<1> =

PC

=

if FLAG<1> =

PC

=

0,

address (FALSE);

1,

address (TRUE)

DS40139E-page 50

© 1999 Microchip Technology Inc.

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