4501 datasheet(16/116 Pages) RENESAS

16 / 116 page

Rev.3.01

2005.02.07

page 16 of 112

REJ03B0104-0301

4501 Group

PROGRAM MEMOY (ROM)

The program memory is a mask 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. Fig-

ure 10 shows the ROM map of M34501M4.

Table 1 ROM size and pages

Part number

M34501M2

M34501M4

M34501E4

ROM (PROM) size

(✕ 10 bits)

2048 words

4096 words

Pages

16 (0 to 15)

32 (0 to 31)

A part of page 1 (addresses 008016 to 00FF16) is reserved for in-

terrupt 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 in-

struction generating the branch to that routine at an interrupt

address.

Page 2 (addresses 010016 to 017F16) is the special page for sub-

routine 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 in-

struction when it starts on page 2.

ROM pattern (bits 7 to 0) of all addresses can be used as data ar-

eas with the TABP p instruction.

Fig. 10 ROM map of M34501M4/M34501E4

Fig. 11 Page 1 (addresses 008016 to 00FF16) structure

876

543

000016

008016

017F16

Subroutine special page

007F16

00FF16

010016

018016

Page 1

Page 2

Page 0

Page 3

Page 31

0FFF16

Interrupt address page

765

432

External 0 interrupt address

008016

008216

Timer 1 interrupt address

008416

Timer 2 interrupt address

008616

008816

008A16

00FF16

A/D interrupt address

008C16

008E16

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