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UPD17P133CS Datasheet(PDF) 74 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) 74 Page - NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
59
7.6 GENERAL REGISTER POINTER (RP)
7.6.1 General Register Pointer Configuration
Figure 7-14 shows the configuration of the general register pointer.
Figure 7-14. General Register Pointer Configuration
As shows in Figure 7-14, the general register pointer consists of seven bits; four bits in system register address
7DH (RPH) and the three high-order bits of system register address 7EH (RPL). However, because the four bits of
address 7DH are always set to 0, the register effectively consists of the three high-order bits of address 7EH.
All register bits are cleared to 0 at reset.
7DH
Address
Name
Bit
Symbol
Data
Initial value when reset
b3
b2
b1
b0
0000
0
(RP)
RPH
7EH
General register
pointer (RP)
b3
b2
b1
b0
B
C
D
0
RPL
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