4280 datasheet(10/48 Pages) RENESAS

10 / 48 page

MITSUBISHI MICROCOMPUTERS

4280 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS

Fig. 10 ROM map of M34280M1

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

Fig. 11 RAM map

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 12 shows the RAM map.

Product

M34280M1

M34280E1

ROM size (! 9 bits)

1024 words

Pages

8 (0 to 7)

Product

M34280M1

M34280E1

RAM size

32 words ! 4 bits (128 bits)

Table 2 RAM size

0 1

RAM 32 words

× 4 bits (128 bits)

32 words

876

54321

000016

008016

017F16

Subroutine special page

007F16

00FF16

010016

03FF16

018016

Page 1

Page 2

Page 0

Page 3

Page 7

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