Bcp Bit Compare - Samsung S3C80A5B User Manual

INSTRUCTION SET
BCP
— Bit Compare
BCP dst,src.b
dst(0) ← src(b)
Operation:
The specified bit of the source is compared to (subtracted from) bit zero (LSB) of the destination.
The zero flag is set if the bits are the same; otherwise it is cleared. The contents of both operands
are unaffected by the comparison.
Flags: C: Unaffected.
Z: Set if the two bits are the same; cleared otherwise.
S: Cleared to "0".
V: Undefined.
D: Unaffected.
H: Unaffected.
Format:
opc
NOTE:
Example: Given: R1 = 07H and register 01H = 01H:
BCP
If destination working register R1 contains the value 07H (00000111B) and the source register 01H
contains the value 01H (00000001B), the statement "BCP R1,01H.1" compares bit one of the
source register (01H) and bit zero of the destination register (R1). Because the bit values are not
identical, the zero flag bit (Z) is cleared in the FLAGS register (0D5H).
6-18
src
dst | b | 0
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.
→ R1 = 07H, register 01H = 01H
R1,01H.1
Bytes Cycles Opcode
3 6
S3C80A5B
Addr Mode
(Hex) dst src
17 r0 Rb