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UPD17P136ACT bảng dữ liệu(PDF) 60 Page - NEC

tên linh kiện UPD17P136ACT
Giải thích chi tiết về linh kiện  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPD17P136ACT bảng dữ liệu(HTML) 60 Page - 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, independently of the banks. This means that each
bank has the same system register at addresses 74H to 7FH.
Since the system register is allocated in data memory, it can be manipulated using any of the data memory
manipulating instructions. Therefore, it is also possible to put the system register in the general register.
Figure 7-1. Allocation of System Register in Data Memory
Figure 7-2 shows the configuration of the system register. As shown in Figure 7-2, the system register consists
of the following seven registers.
• Address register
(AR)
• Window register
(WR)
• Bank register
(BANK)
• Index register
(IX)
• Data memory row address pointer
(MP)
• General register pointer
(RP)
• Program status word
(PSWORD)
System register
BANK1
Unmounted
Port register
Port register
Data memory
BANK0
0
123456789
A
B
C
D
E
F
Column address
0
1
2
3
4
5
6
7
01
2
3
456789
A
B
C
D
E
F
41



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