PIC12C5XX
BSF
Bit Set f
BTFSS
Bit Test f, Skip if Set
Syntax:
Operands:
[ label ] BSF f,b
Syntax:
[ label ] BTFSS f,b
0 ≤ f ≤ 31
0 ≤ b ≤ 7
Operands:
0 ≤ f ≤ 31
0 ≤ b < 7
Operation:
1 → (f<b>)
Operation:
skip if (f<b>) = 1
Status Affected: None
Status Affected: None
0101
bbbf
ffff
0111
bbbf
ffff
Encoding:
Description:
Words:
Encoding:
Bit ’b’ in register ’f’ is set.
If bit ’b’ in register ’f’ is ’1’ then the next
instruction is skipped.
Description:
1
1
If bit ’b’ is ’1’, then the next instruction
fetched during the current instruction
execution, is discarded and an NOP is
executed instead, making this a 2 cycle
instruction.
Cycles:
BSF
FLAG_REG,
7
Example:
Before Instruction
FLAG_REG = 0x0A
Words:
1
After Instruction
FLAG_REG = 0x8A
Cycles:
Example:
1(2)
HERE
FALSE GOTO
TRUE
BTFSS FLAG,1
PROCESS_CODE
•
BTFSC
Bit Test f, Skip if Clear
•
•
Syntax:
[ label ] BTFSC f,b
Operands:
0 ≤ f ≤ 31
0 ≤ b ≤ 7
Before Instruction
PC
=
address (HERE)
After Instruction
If FLAG<1>
PC
Operation:
skip if (f<b>) = 0
=
=
=
=
0,
Status Affected: None
address (FALSE);
1,
address (TRUE)
bbbf
ffff
if FLAG<1>
PC
Encoding:
0110
If bit ’b’ in register ’f’ is 0 then the next
instruction is skipped.
Description:
If bit ’b’ is 0 then the next instruction
fetched during the current instruction
execution is discarded, and an NOP is
executed instead, making this a 2 cycle
instruction.
Words:
1
Cycles:
Example:
1(2)
HERE
FALSE
TRUE
BTFSC
GOTO
•
•
•
FLAG,1
PROCESS_CODE
Before Instruction
PC
=
address (HERE)
After Instruction
if FLAG<1>
PC
=
=
=
=
0,
address (TRUE);
1,
address(FALSE)
if FLAG<1>
PC
DS40139E-page 50
1999 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
