PIC18LF1320-I/SOSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF1320-I/SOSQTP

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F1220/1320

BTFSC

Bit Test File, Skip if Clear

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

[ label ] BTFSC f,b[,a]

0 ≤ f ≤ 255

0≤b≤7

a ∈ [0,1]

skip if (f<b>) = 0

None

1011 bbba ffff ffff

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

Q4

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:

Q1

Q2

Q3

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Q4

No

operation

Q4

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSC

:

:

FLAG, 1

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:

Operation:

Status Affected:

Encoding:

Description:

[ label ] BTFSS f,b[,a]

0 ≤ f ≤ 255

0≤b<7

a ∈ [0,1]

skip if (f<b>) = 1

None

1010 bbba ffff ffff

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

Q4

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:

Q1

Q2

Q3

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Q4

No

operation

Q4

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSS

:

:

FLAG, 1

Before Instruction

PC

=

After Instruction

If FLAG<1> =

PC

=

If FLAG<1> =

PC

=

address (HERE)

0;

address (FALSE)

1;

address (TRUE)

DS39605F-page 204

© 2007 Microchip Technology Inc.

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