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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁

  • NEC   NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
Figure 7-12. Example of Operation When MPE=0 and IXE=1
Column address
0
0
1
Row address
2
3
Direct
Index modification
address
M034 : 00000110100B
5
OR) IX
: 00000000001B
6 Real address 00000110101B
4
7
M034
Example 2.
MOV @R005, M034
Indirect address
1
2
3
4
5
8
6
7
8
9
A
B
C
D
E
F
General
register
Column address specified
as transfer destination
R005
System register
Example 3. Clearing all data memory (setting to 0)
M000
MEM
MOV
MOV
MOV
LOOP:
OR
MOV
INC
AND
SKE
BR
PSW, #.DF.IXE AND 0FH
M000, #0
IX
PSW, #1110B
IXM, #0111B
LOOP
;
;
;
;
;
;
;
;
IXE
鈫?/div>
1
Set data memory specified by IX to 0
IX
鈫?/div>
IX+1
IXE
鈫?/div>
0: IXE is set to 0 so that
address 7FH is not modified by IX.
Row address 7?
If not 7 then LOOP (row address is
not cleared)
0.00H
IXL, #0
IXM, #0
IXH, #0
;
;
;
MPE
鈫?/div>
0
IX
鈫?/div>
0
57

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