M34551 View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M34551

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

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

PROGRAM MEMORY (ROM)

1 word of ROM is composed of 10 bits. ROM is separated every

128 words by the unit of page (addresses 0 to 127). Table 1

shows the ROM size and pages. Figure 10 shows the ROM map

of M34551E8.

Table 1 ROM size and pages

Product

ROM size

(! 10 bits)

M34551M4

4096 words

M34551E8

8192 words

Pages

32 (0 to 31)

64 (0 to 63)

98 7 6 5 4 3 2 10

000016

007F16

008016

00FF16

010016

017F16

018016

Interrupt address page

Subroutine special page

Page 0

Page 1

Page 2

Page 3

0FFF16

Page 31

A top part of page 1 (addresses 008016 to 00FF16) is reserved

for interrupt addresses (Figure 11). When an interrupt occurs,

the address (interrupt address) corresponding to each interrupt

is set in the program counter, and the instruction at the interrupt

address is executed. When using an interrupt service routine,

write the instruction generating the branch to that routine at an

interrupt address.

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 (bits 7 to 0) of all addresses can be used as data

areas with the TABP p instruction.

1FFF16

Fig. 10 ROM map of M34551E8

Page 63

98 7 6 5 4 3 2 10

008016 External 0 interrupt address

008416 Timer 1 interrupt address

008616 Timer 2 interrupt address

00FF16

Fig. 11 Interrupt address page (addresses 008016 to 00FF16) structure

11

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