UPD17P136ACT datasheet(91/292 Pages) NEC

номер детали	UPD17P136ACT

подробное описание детали	4-BIT SINGLE-CHIP MICROCONTROLLER

PDF	292 Pages

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производитель	NEC [NEC]

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CHAPTER 9 REGISTER FILE (RF)

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:

0123456789

BANK0

3 PEEK WR, RF53

8 POKE RF72, WR

7 PEEK WR, RF70

4 POKE RF6D, WR

BANK1

Unmounted

System register

POKE RF1F, WR

Control register

Column address

Data memory

2 6

PEEK WR, RF02

UPD17P136ACT датащи(PDF) 91 Page - NEC