PIC18F010 datasheet(110/176 Pages) MICROCHIP

110 / 176 page

PIC18F010/020

DS41142A-page 108

Preliminary

 2001 Microchip Technology Inc.

BTFSC

Bit Test File, Skip if Clear

Syntax:

[ label ] BTFSC f, b [,a]

Operands:

≤ f ≤ 255

≤ b ≤ 7

∈ [0,1]

Operation:

skip if (f<b>) = 0

Status Affected:

None

Encoding:

1011

bbba

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, over-

riding the BSR value. If ’a’ is 1, the

Bank will be selected as per the BSR

value.

Words:

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

FALSE

TRUE

BTFSC

FLAG, 1, ACCESS

Before Instruction

address (HERE)

After Instruction

If FLAG<1>

address (TRUE)

If FLAG<1>

address (FALSE)

BTFSS

Bit Test File, Skip if Set

Syntax:

[ label ] BTFSS f, b [,a]

Operands:

≤ f ≤ 255

≤ b < 7

∈ [0,1]

Operation:

skip if (f<b>) = 1

Status Affected:

None

Encoding:

1010

bbba

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 instruc-

tion execution, is discarded and an

NOP

is executed instead, making this

a two-cycle instruction. If ’a’ is 0, the

Access Bank will be selected, over-

riding the BSR value. If ’a’ is 1, the

Bank will be selected as per the BSR

value.

Words:

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

FALSE

TRUE

BTFSS

FLAG, 1, ACCESS

Before Instruction

address (HERE)

After Instruction

If FLAG<1>

address (FALSE)

If FLAG<1>

address (TRUE)

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