PIC18F258-ESLASHLSQTP datasheet(296/402 Pages) MICROCHIP

296 / 402 page

PIC18FXX8

DS41159E-page 294

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, overriding the BSR

value. If ‘a’ = 1, then the bank will be

selected as per the BSR value (default).

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

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 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:

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

Before Instruction

address (HERE)

After Instruction

If FLAG<1>

address (FALSE)

If FLAG<1>

address (TRUE)

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