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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 9 REGISTER FILE (RF)
The register file is a register used mainly for specifying conditions for peripheral hardware.
9.1 REGISTER FILE CONFIGURATION
9.1.1 Configuration of the Register File
Figure 9-1 shows the configuration of the register file.
As shown in Figure 9-1, the register file is a register consisting of 128 nibbles (128 words
脳
4 bits).
In the same way as with data memory, the register file is divided into address in units of four bits. It has a total
of 128 nibbles specified in row addresses from 0H to 7H and column address from 0H to 0FH.
Address locations 00H to 3FH define an area the control register.
Figure 9-1. Register File Configuration
Column address
0 1 2 3 4 5 6 7 8 9 A B C D E F
0
1
Row address
2
3
4
5
6
7
General register
9.1.2 Relationship between the Register File and Data Memory
Figure 9-2 shows the relationship between the register file and data memory.
As shown in Figure 9-2, the register file overlaps with data memory in addresses 40H to 7FH.
This means that the same memory exists in register file addresses 40H to 7FH and in data memory bank addresses
40H to 7FH.
71

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