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UPD17P136ACT Datasheet(PDF) 64 Page - NEC

Part # UPD17P136ACT
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17P136ACT Datasheet(HTML) 64 Page - NEC

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CHAPTER 7 SYSTEM REGISTER (SYSREG)
45
7.3 WINDOW REGISTER (WR)
7.3.1 Window Register Configuration
Figure 7-5 shows the configuration of the window register.
As shown in Figure 7-5, the window register (WR) consists of four bits allocated at address 78H of the system
register. The contents of the window register is undefined after reset. However, when RESET is used to release the
system from HALT or STOP mode, the previous state is maintained.
Figure 7-5. Window Register Configuration
7.3.2 Window Register Functions
The window register is used to transfer data to and from the register file (RF).
Data is transferred to and from the register file using the dedicated instructions “PEEK WR, rf” and “POKE rf, WR”.
(1) PEEK WR, rf
As shown in Figure 7-6, the “PEEK WR, rf” instruction is used to transfer the contents of the register file
specified by rf to the window register.
(2) POKE rf, WR
As shown in Figure 7-6, the “POKE rf, WR” instruction is used to transfer the contents of the window register
to the file specified by rf.
Figure 7-6. Example of Window Register Operation
b3
b2
b1
b0
Bit
Symbol
Name
Address
Data
Initial value when reset
78H
Window register
WR
Undefined
0123456789
A
B
C
D
E
F
0
1
2
3
4
5
6
7
System register
Column address
POKE instruction
PEEK instruction
WR
Control register
Register file
Data memory



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