Datasheet

PIC16F8X
DS30430B-page 58  1996 Microchip Technology Inc.
BCF Bit Clear f
Syntax: [ label ] BCF f,b
Operands: 0 ≤ f ≤ 127
0 ≤ b ≤ 7
Operation: 0 → (f<b>)
Status Affected: None
Encoding:
01 00bb bfff ffff
Description:
Bit 'b' in register 'f' is cleared
.
Words: 1
Cycles: 1
Example
BCF FLAG_REG,7
Before Instruction
FLAG_REG = 0xC7
After Instruction
FLAG_REG = 0x47
BSF Bit Set f
Syntax: [ label ] BSF f,b
Operands: 0 ≤ f ≤ 127
0 ≤ b ≤ 7
Operation: 1 → (f<b>)
Status Affected: None
Encoding:
01 01bb bfff ffff
Description:
Bit 'b' in register 'f' is set.
Words: 1
Cycles: 1
Example
BSF FLAG_REG, 7
Before Instruction
FLAG_REG= 0x0A
After Instruction
FLAG_REG= 0x8A
BTFSC Bit Test f, Skip if Clear
Syntax: [
label ] BTFSC f,b
Operands: 0 ≤ f ≤ 127
0 ≤ b ≤ 7
Operation: skip if (f<b>) = 0
Status Affected: None
Encoding:
01 10bb bfff 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 2 cycle
instruction
.
Words: 1
Cycles: 1(2)
Example
HERE
FALSE
TRUE
BTFSC
GOTO
•
•
•
FLAG,1
PROCESS_CODE
Before Instruction
PC = address HERE
After Instruction
if FLAG<1>=0,
PC=address TRUE
if FLAG<1>=1,
PC=address FALSE