Rev. 1.50, 10/04, page 339 of 448
10.1.80 XOR (Exclusive OR Logical): Logical Instruction
Format Operation Instruction Code Cycle T Bit
XOR Rm,Rn Rn ^ Rm → Rn 0010nnnnmmmm1010 1 —
XOR #imm,R0 R0 ^ imm → R0 11001010iiiiiiii 1 —
XOR.B #imm,@(R0,GBR) (R0 + GBR)^imm →
(R0 + GBR)
11001110iiiiiiii 3 —
Description: This instruction exclusively ORs the contents of general registers Rn and Rm, and
stores the result in Rn.
This instruction can be used to exclusively OR register R0 contents with zero-extended 8-bit
immediate data, or, in indexed GBR indirect addressing mode, to exclusively OR 8-bit memory
with 8-bit immediate data.
Notes: None
Operation:
XOR(long m, long n) /* XOR Rm,Rn */
{
R[n] ^= R[m];
PC += 2;
}
XORI(long i) /* XOR #imm,R0 */
{
R[0] ^= (0x000000FF & (long)i);
PC += 2;
}
XORM(long i) /* XOR.B #imm,@(R0,GBR) */
{
int temp;
temp = (long)Read_Byte(GBR+R[0]);
temp ^= (0x000000FF &(long)i);
Write_Byte(GBR+R[0],temp);
PC += 2;
}
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