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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁

  • NEC   NEC

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上傳產品規(guī)格書

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
Example 4. Processing an array
As shown in Figure 7-13, to perform the operation:
A(N) = A(N) + 4 (0
鈮?/div>
N
鈮?/div>
15)
on the element A(N) of a one-dimensional array in which an element is 8 bits, the following
instructions are executed:
M000
M001
MOV
MOV
MOV
OR
ADD
ADDC
MEM 0.00H
MEM 0.01H
IXH, #0
IXM, #N SHR 3
IXL, #N SHL 1 AND 0FH
M000, #4
M001, #0
;
;
;
;
A(N)
鈫?/div>
A(N) + 4
Set the offset of the row address.
Set the offset of the column address.
IXE
鈫?/div>
1
PSW, #.DF.IXE AND 0FH ;
In the example above, because an element is 8 bits, the value resulting from left-shifting the
N's value by 1 bit is set for the index register.
Figure 7-13. Example of Operation When MPE=0 and IXE=1 (Array Processing)
Column address
0
0
1
Row address
2
A (0)
3
4
b
3
5
6
7
00H
b
2
b
1
b
0
b
7
01H
b
6
b
5
b
4
A (0)
A (8)
1
2
A (1)
A (9)
3
4
A (2)
A (10)
5
6
A (3)
A (11)
7
8
A (4)
A (12)
9
A
A (5)
A (13)
B
C
A (6)
A (14)
D
E
A (7)
A (15)
F
System register
58

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