4282 View Datasheet(PDF) - MITSUBISHI ELECTRIC
Part Name
Description
Manufacturer
4282 Datasheet PDF : 70 Pages
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MITSUBISHI MICROCOMPUTERS
4282 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PROGRAM MEMORY (ROM)
The program memory is a mask ROM. 1 word of ROM is
composed of 9 bits. ROM is separated every 128 words by the
unit of page (addresses 0 to 127).
Table 1 ROM size and pages
Product
ROM size (✕ 9 bits)
M34282M2/E2
2048 words
M34282M1
1024 words
Pages
16 (0 to 15)
8 (0 to 7)
000016
007F16
008016
00FF16
010016
017F16
018016
8 7 6 5 4 3 2 10
Page 0
Page 1
Subroutine special page Page 2
Page 3
Page 2 (addresses 010016 to 017F16) is the special page for
subroutine calls. Subroutines written in this page can be called
from any page with the 1-word instruction (BM). Subroutines
extending from page 2 to another page can also be called with
the BM instruction when it starts on page 2.
ROM pattern of all addresses can be used as data areas with
the TABP p instruction.
DATA MEMORY (RAM)
1 word of RAM is composed of 4 bits, but 1-bit manipulation
(with the SB j, RB j, and SZB j instructions) is enabled for the
entire memory area. A RAM address is specified by a data
pointer. The data pointer consists of registers X and Y. Set a
value to the data pointer certainly when executing an instruction
to access RAM.
Table 2 shows the RAM size. Figure 11 shows the RAM map.
Table 2 RAM size
Product
M34282M2/E2
M34282M1
RAM size
64 words ✕ 4 bits (256 bits)
48 words ✕ 4 bits (192 bits)
07FF16
Fig. 10 ROM map of M34282M2/E2
Page 15
RAM 64 words ✕ 4 bits (256 bits)
Register X 0 1 2 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
48 words
M34282M1
64 words
M34282M2/E2
Fig. 11 RAM map
MITSUBISHI
ELECTRIC
9
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