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BIOR (Bit Invert OR)
<Operation>
C ∨ [¬ (<Bit No.> of <EAd>)]
<Assembly-Language Format>
BIOR #xx:3, <EAd>
<Examples>
BIOR #6, R1H
BIOR #3, @R2
BIOR #0, @H'FFF0:8
<Operand Size>
Byte
<Description>
This instruction ORs the inverse of a specified bit with the carry flag and places the result in
the carry flag. The specified bit can be located in a general register or memory. The bit
number is specified by 3-bit immediate data. The operation is shown schematically below.
→
<EAd>*
Byte data in register or memory
The value of the specified bit is not changed.
<Instruction Formats>
Addressing
mode
Register direct
Register indirect
Absolute address
*Register direct, register indirect, or absolute addressing.
→
C
Bit No.
Mnem.
Operands
BIOR
#xx:3, Rd
BIOR
#xx:3,@Rd
BIOR
#xx:3,@aa:8
<Condition Code>
I
— — — — — — —
I: Previous value remains unchanged.
H: Previous value remains unchanged.
N: Previous value remains unchanged.
Z: Previous value remains unchanged.
V: Previous value remains unchanged.
C: ORed with the inverse of the specified
bit.
#xx:3
7
C
Instruction code
1st byte
2nd byte
1 IMM
rd
7
4
0 rd
0
7
C
7
E
abs
51
H
N
Z
0
Invert
C
3rd byte
4th byte
4 1 IMM 0
7
7
4 1 IMM 0
BIOR
V
C
No. of
states
2
6
6
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