DM163006 datasheet(228/320 Pages) MICROCHIP

228 / 320 page

PIC18C601/801

DS39541A-page 228

Advance Information

 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, overriding 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

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, 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

Before Instruction

address (HERE)

After Instruction

If FLAG<1>

address (FALSE)

If FLAG<1>

address (TRUE)

DM163006 Datasheet(PDF) 228 Page - Microchip Technology

DM163006 Datasheet(HTML) 228 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL