PIC18F1220ESLASHSSSQTP datasheet(206/308 Pages) MICROCHIP

206 / 308 page

PIC18F1220/1320

DS39605F-page 204

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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