Samsung S3C9454B User Manual page 119

SAM88RCRI INSTRUCTION SET
XOR
— Logical Exclusive OR
XOR dst,src
dst ← dst XOR src
Operation:
The source operand is logically exclusive-ORed with the destination operand and the result is
stored in the destination. The exclusive-OR operation results in a "1" bit being stored whenever
the corresponding bits in the operands are different; otherwise, a "0" bit is stored.
Flags: C: Unaffected.
Z: Set if the result is "0"; cleared otherwise.
S: Set if the result bit 7 is set; cleared otherwise.
V: Always reset to "0".
Format:
opc
opc
opc
Examples: Given: R0 = 0C7H, R1 = 02H, R2 = 18H, register 00H = 2BH, register 01H = 02H, and
register 02H = 23H:
XOR
XOR
XOR
XOR
XOR
In the first example, if working register R0 contains the value 0C7H and if register R1 contains the
value 02H, the statement "XOR R0,R1" logically exclusive-ORs the R1 value with the R0 value
and stores the result (0C5H) in the destination register R0.
6-50
dst | src
src dst
dst src
→
R0,R1 R0 = 0C5H, R1 = 02H
→
R0,@R1 R0 = 0E4H, R1 = 02H, register 02H = 23H
→
00H,01H Register 00H = 29H, register 01H = 02H
→
00H,@01H Register 00H = 08H, register 01H = 02H, register 02H = 23H
→
00H,#54H Register 00H = 7FH
Bytes Cycles Opcode
2 4
6
3 6
6
3 6
S3C9454B/F9454B
Addr Mode
(Hex) dst src
B2 r r
B3 r lr
B4 R R
B5 R IR
B6 R IM