PIC18F8520-IPT301 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F8520-IPT301

64/80-Pin High-Performance, 256 Kbit to 1 MbitEnhanced Flash Microcontrollers with A/D

Microchip Technology 

PIC18F6520/8520/6620/8620/6720/8720

BTFSC

Bit Test File, Skip if Clear

Syntax:

Operands:

[ label ] BTFSC f,b[,a]

0  f  255

0b7

a [0,1]

Operation:

skip if (f<b>) = 0

Status Affected: None

Encoding:

1011 bbba ffff 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 a NOP is executed instead,

making this a two-cycle instruction. If

‘a’ is ‘0’, the Access Bank will be

selected, overriding the BSR value. If

‘a’ = 1, then the bank will be selected

as per the BSR value (default).

Words:

1

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Q1

Q2

Q3

Decode

Read

register ‘f’

Process

Data

If skip:

Q1

Q2

Q3

No

operation

No

operation

No

operation

If skip and followed by 2-word instruction:

Q4

No

operation

Q4

No

operation

Q1

Q2

Q3

Q4

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSC

:

:

FLAG, 1, 0

Before Instruction

PC

=

After Instruction

If FLAG<1> =

PC

=

If FLAG<1> =

PC

=

address (HERE)

0;

address (TRUE)

1;

address (FALSE)

BTFSS

Bit Test File, Skip if Set

Syntax:

Operands:

[ label ] BTFSS f,b[,a]

0  f  255

0b<7

a [0,1]

Operation:

skip if (f<b>) = 1

Status Affected: None

Encoding:

1010 bbba ffff 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 a NOP is executed instead,

making this a two-cycle instruction. If

‘a’ is ‘0’, the Access Bank will be

selected, overriding the BSR value. If

‘a’ = 1, then the bank will be selected

as per the BSR value (default).

Words:

1

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Q1

Q2

Q3

Decode

Read

register ‘f’

Process

Data

If skip:

Q1

Q2

Q3

No

operation

No

operation

No

operation

If skip and followed by 2-word instruction:

Q4

No

operation

Q4

No

operation

Q1

Q2

Q3

Q4

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSS

:

:

FLAG, 1, 0

Before Instruction

PC

=

After Instruction

If FLAG<1> =

PC

=

If FLAG<1> =

PC

=

address (HERE)

0;

address (FALSE)

1;

address (TRUE)

DS39609C-page 272

 2003-2013 Microchip Technology Inc.

Share Link: