PIC18FXX39
DS30485A-page 224
Preliminary
2002 Microchip Technology Inc.
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
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’ = 1, then
the bank will be selected as per the
BSR value (default).
Words:
1
Cycles:
1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process Data
No
operation
If skip:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE
FALSE
TRUE
BTFSC
:
FLAG, 1, 0
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
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 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’ = 1, then
the bank will be selected as per the
BSR value (default).
Words:
1
Cycles:
1(2)
Note:
3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process Data
No
operation
If skip:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE
FALSE
TRUE
BTFSS
:
FLAG, 1, 0
Before Instruction
PC
=
address (HERE)
After Instruction
If FLAG<1>
=
0;
PC
=
address (FALSE)
If FLAG<1>
=
1;
PC
=
address (TRUE)
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