Datasheet

 1998-2013 Microchip Technology Inc. DS30289C-page 205
PIC17C7XX
BSF Bit Set f
Syntax: [ label ] BSF f,b
Operands: 0  f  255
0  b  7
Operation: 1  (f<b>)
Status Affected: None
Encoding:
1000 0bbb ffff ffff
Description:
Bit 'b' in register 'f' is set.
Words: 1
Cycles: 1
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Process
Data
Write
register 'f'
Example:
BSF FLAG_REG, 7
Before Instruction
FLAG_REG = 0x0A
After Instruction
FLAG_REG = 0x8A
BTFSC Bit Test, skip if Clear
Syntax: [ label ] BTFSC f,b
Operands: 0  f  255
0  b  7
Operation: skip if (f<b>) = 0
Status Affected: None
Encoding:
1001 1bbb ffff 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 exe-
cution is discarded and a NOP is executed
instead, making this a two-cycle
instruction.
Words: 1
Cycles: 1(2)
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
Example:
HERE
FALSE
TRUE
BTFSC
:
:
FLAG,1
Before Instruction
PC = address (HERE)
After Instruction
If FLAG<1> = 0;
PC = address (TRUE)
If FLAG<1> = 1;
PC = address (FALSE)