PIC18LF4331T-IP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4331T-IP

28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

Microchip Technology 

PIC18F2331/2431/4331/4431

BTFSC

Bit Test File, Skip if Clear

Syntax:

[ label ] BTFSC f,b[,a]

Operands:

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.

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:

Q1

Q2

Q3

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Q4

No

operation

Q4

No

operation

Q4

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSC

:

:

FLAG, 1

Before Instruction

PC

= address (HERE)

After Instruction

If FLAG<1> = 0;

PC

= address (TRUE)

If FLAG<1> = 1;

PC

= address (FALSE)

BTFSS

Bit Test File, Skip if Set

Syntax:

[ label ] BTFSS f,b[,a]

Operands:

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.

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:

Q1

Q2

Q3

No

operation

No

operation

No

operation

No

operation

No

operation

No

operation

Q4

No

operation

Q4

No

operation

Q4

No

operation

No

operation

Example:

HERE

FALSE

TRUE

BTFSS

:

:

FLAG, 1

Before Instruction

PC

= address (HERE)

After Instruction

If FLAG<1> = 0;

PC

= address (FALSE)

If FLAG<1> = 1;

PC

= address (TRUE)

DS39616D-page 296

 2010 Microchip Technology Inc.

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