Xinje XD Series - 4-8-14 High bit coding [ENCO]

160
executed.
 N = 3, so the decoding object in D0 is bit2-bit0, and the maximum value it represents is 4 + 2
+ 1 = 7.
 N = 3, so in D1, 2
3
= 8 bits are needed to represent the decoding result, that is, bit7 ~ bit0.
 When bit2 and bit1 are both 1 and bit0 are 0, the value is 4+2=6, so bit6 in D1 is ON.
< is word soft component > n≤4
D0DECO D1 K4
X0
n
S· D·
0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
7 6 5 4
2
1 0
D0
D1
bit15
bit15 bit0
bit0
4
2
18
3
11 10 9 813
12
15
14
 The low n-bit (n ≤4) of the source address is decoded to the target address. When n ≤ 3, the
high 8-bit of the target turns to 0.
 If n = 0, the instruction will not be executed. If n is out of 0 ~ 4, the instruction will not be
executed.
 N = 4, so the object of decoding in D0 is bit3 ~ bit0, which represents the maximum value of
8 + 4 + 2 + 1 = 15.
 N = 4, so in D1, 2
4
=16 bits are needed to represent the decoding result, that is, bit15 ~ bit0.
 When bit3, bit1 and bit0 are all 1 and bit2 is 0, the numerical value is 8+2+1=11, so bit11 in
D1 is ON.
4-8-14 High bit coding [ENCO]
1) Summary
Find the highest bit which is 1.
High bit coding [ENCO]
16 bits
ENCO
32 bits
-
Execution
condition
Normally ON/OFF,
rising/falling edge
Suitable
Models
XD, XL
Hardware
requirement
-
Software
requirement
-
2) Operands
Operands
Function
Data Type
S
Coding data address
16 bits, BIN
D
Coding result address
16 bits, BIN
n
The bit quantity of coding result
16 bits, BIN
D·
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