PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 292

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
BTFSC
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS41159B-page 290
Q Cycle Activity:
If skip:
If skip and followed by 2-word instruction:
Before Instruction
After Instruction
operation
operation
operation
Decode
PC
If FLAG<1>
If FLAG<1>
No
No
No
Q1
Q1
Q1
PC
PC
Bit Test File, Skip if Clear
[ label ] BTFSC f,b[,a]
0
0
a
skip if (f<b>) = 0
None
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).
1
1(2)
Note: 3 cycles if skip and followed
register ’f’
HERE
FALSE
TRUE
operation
operation
operation
Read
1011
No
No
No
Q2
Q2
Q2
=
=
=
=
=
f
b
[0,1]
255
7
address (HERE)
0;
address (TRUE)
1;
address (FALSE)
by a 2-word instruction.
BTFSC
:
:
Process Data
bbba
operation
operation
operation
No
No
No
Q3
Q3
Q3
FLAG, 1
ffff
operation
operation
operation
operation
No
No
No
No
Q4
Q4
Q4
ffff
BTFSS
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
If skip:
If skip and followed by 2-word instruction:
Before Instruction
After Instruction
operation
operation
operation
Decode
PC
If FLAG<1>
If FLAG<1>
No
No
No
Q1
Q1
Q1
PC
PC
Bit Test File, Skip if Set
[ label ] BTFSS f,b[,a]
0
0
a
skip if (f<b>) = 1
None
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).
1
1(2)
Note:
HERE
FALSE
TRUE
register ’f’
operation
operation
operation
Read
1010
No
No
No
Q2
Q2
Q2
=
=
=
=
=
f
b
[0,1]
2002 Microchip Technology Inc.
255
7
address (HERE)
0;
address (FALSE)
1;
address (TRUE)
3 cycles if skip and followed
by a 2-word instruction.
BTFSS
:
:
Process Data
bbba
operation
operation
operation
No
No
No
Q3
Q3
Q3
FLAG, 1
ffff
operation
operation
operation
operation
No
No
No
No
Q4
Q4
Q4
ffff