Samsung S3C8275X - Manual (Page 153)

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X INSTRUCTION SET
6-19
BITC
— Bit Complement
BITC dst.b
Operation: dst(b)
← NOT dst(b)
This instruction complements the specified bit within the destination without affecting any other
bits in the destination.
Flags: C: Unaffected.
Z: Set if the result is "0"; cleared otherwise.
S: Cleared to "0".
V: Undefined.
D: Unaffected.
H: Unaffected.
Format:
Bytes Cycles Opcode
(Hex)
Addr Mode
dst
opc dst | b | 0 2 4 57 rb
NOTE: In the second byte of the instruction format, the destination address is four bits, the bit address 'b'
is three bits, and the LSB address value is one bit in length.
Example: Given: R1 = 07H
BITC R1.1
→
R1 = 05H
If working register R1 contains the value 07H (00000111B), the statement "BITC R1.1"
complements bit one of the destination and leaves the value 05H (00000101B) in register R1.
Because the result of the complement is not "0", the zero flag (Z) in the FLAGS register (0D5H) is
cleared.