4571 datasheet(15/126 Pages) RENESAS

15 / 126 page

Rev.1.02

May 25, 2007

Page 15 of 124

REJ03B0179-0102

4571 Group

PROGRAM MEMORY (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. Figure 16 shows the ROM map of M34571G6.

Note 1.Data in pages 64 to 127 can be referred with the TABP p

instruction after the SBK instruction is executed.

Data in pages 0 to 63 can be referred with the TABP p

instruction after the RBK instruction is executed.

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

interrupt addresses (Figure 17). 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 9 to 0) of all addresses can be used as data

areas with the TABP p instruction.

ROM Code Protect Address

When selecting the protect b it wr ite by using a serial

programmer or selecting protect enabled for writing shipment by

Renesas Technology corp., reading or writing from/to QzROM is

disabled by a serial programmer.

As for the QzROM product in blank, the ROM code is protected

by selecting the protect bit write at ROM writing with a serial

programmer.

As for the QzROM product shipped after writing, whether the

ROM code protect is used or not can be selected as ROM option

setup (“MASK option” written in the mask file converter) when

ordering.

Fig 16. ROM map of M34571GD

Fig 17. Page 1 (addresses 008016 to 00FF16) structure

Table 8

ROM size and pages

Part number

ROM (PROM) size

(

× 10 bits)

Pages

M34571G4

4096 words

32 (0 to 31)

M34571G6

6144 words

48 (0 to 47)

M34571GD

16384 words

128 (0 to 127)

Interrupt address page

Subroutine special page

000016

007F16

008016

00FF16

010016

017F16

018016

3FFF16

Page 127

Page 0

Page 1

Page 2

Page 3

9 8

00FF16

008C16

008A16

008816

008616

008416

008216

008016

4321

008E16 Voltage drop detection circuit interrupt address

Timer 2 interrupt address

Timer 1 interrupt address

External 0 interrupt address

External 1 interrupt address

Timer 3 interrupt address

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