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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 7 SYSTEM REGISTER (SYSREG)
The system register (SYSREG), located in data memory, is used for direct control of the CPU.
7.1 SYSTEM REGISTER CONFIGURATION
Figure 7-1 shows the allocation address of the system register in data memory. As shown in Figure 7-1, the system
register is allocated in addresses 74H to 7FH of data memory.
Because the system register is allocated in data memory, it can be manipulated using any of the instructions
available for manipulating data memory. Therefore, it is also possible to put the system register in the general register.
Figure 7-1. Allocation of System Register in Data Memory
Column address
0
0
1
Row address
2
3
4
5
6
7
Port register
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
System register (SYSREG)
Data memory
(BANK0)
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
41

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