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3. Instruction Set
3-105
Program Example 2:
1. When D is used as a word device, n = 1 ~ 4. Errors will occur if n = 0 or n > 4.
2. When n = 4, the decoded data is 2
4
= 16 bits.
3. When X20 goes from OFF to ON, the data in D10 (b2 to b0) will be decoded and stored in
D20 (b7 to b0). The unused bits in D20 (b15 to b8) will be set to 0.
4. The lower 3 bits of D10 are decoded and stored in the lower 8 bits of D20. The higher 8 bits
of D20 are all 0.
5. After the execution is completed, X20 is turned OFF. The decoded results or outputs will
retain their operation.
DECOP D10 K3D20
X20
0000000011111111
0000 00000000100 0
01234567
1
24
b15
b15 b0
b0
D10
D20
all be 0