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UPD17P136ACT Datasheet(PDF) 91 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) 91 Page - NEC

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CHAPTER 9 REGISTER FILE (RF)
72
Figure 9-3. Accessing the Register File Using the PEEK and POKE Instructions
9.3 CONTROL REGISTER
Figure 9-4 shows the configuration of the control register.
As shown in Figure 9-4, the control register consists of 64 nibbles (64 ! 4 bits) allocated in register file addresses
00H to 3FH.
However, only 26 nibbles are actually used. The remaining 38 nibbles are allocated for registers which have not
yet been implemented. Data should not be read from or written to this area.
There are two types of registers, both of which occupy one nibble of memory. One type is read/write
(R/W), and the other is read-only (R).
Note that within the read/write (R/W) flags, there exists a flag that will always be read as 0.
The following read/write (R/W) flags are those flags which will always be read as 0:
WR
0123456789
A
B
C
D
E
F
0
1
2
3
4
5
6
7
0
3
1
2
3
4
5
6
7
BANK0
3 PEEK WR, RF53
8 POKE RF72, WR
7 PEEK WR, RF70
4 POKE RF6D, WR
BANK1
Unmounted
System register
1
POKE RF1F, WR
Control register
Register file for BANK0
Register file for BANK1
Column address
Data memory
5
2 6
PEEK WR, RF02



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