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UPD17P133CS Datasheet(PDF) 56 Page - NEC

Part # UPD17P133CS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  289 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17P133CS Datasheet(HTML) 56 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.
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
0
1
2
3
4
5
6
7
0123456789
A
B
C
D
E
F
Column address
Data memory
(BANK0)
0123
456789
A
B
C
D
E
F
Port register
System register (SYSREG)
41



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