Chapter 6 Applied Instructions
6-205
API
Instruction code Operand Function
0806
XNR P
S
1
, S
2
, D
Logical exclusive NOR operation
Device
X Y M S T C HC D L SM SR E PR K 16#
“$” DF
16-bit instruction (7 steps)
32-bit instruction (7 steps)
Symbol:
S
1
：
Data source 1 Word/Double word
S
2
：
Data source 2 Word/Double word
D
：
Operation result Word/Double word
Explanation:
1. The logical operator XNR takes the binary representations in S
1
and S
2
, and performs the
logical exclusive NOR operation on each pair of corresponding bits. The operation result is
stored in D.
2. Only the instruction DXNR can use the 32-bit counter.
3. The result in each position is 1 if the two bits are the same, and 0 if they are different.
Example 1:
When X0.0 is ON, the logical operator XNR takes the data in the 16-bit device Y0 and the 16-bit
device Y2, and performs the logical exclusive NOR operation on each pair of corresponding bits.
The operation result is stored in Y4.
Example 2:
When X0.0 is ON, the logical operator XNR takes the data in the 32-bit device (Y11, Y10) and the
32-bit device (Y21, Y20), and performs the logical exclusive NOR operation on each pair of
corresponding bits. The operation result is stored in (Y41, Y40).
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