4553 datasheet(141/145 Pages) RENESAS

141 / 145 page

Rev.3.02

Dec 22, 2006

page 141 of 142

REJ03B0024-0302

4553 Group

Fig. 69 Pin configuration of built-in PROM version

PIN CONFIGURATION (TOP VIEW)

36 35 34 33 32 31 30 29 28 27 26 25

910 11 12

RESET

XCOUT/D7

XCIN/D6

CNVSS

XOUT

XIN

VSS

VDD

C/CNTR

D5/INT

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

P20/SEG17

P21/SEG18

P22/SEG19

M34553G8FP

M34553G8HFP

SCLK

VDD

VSS

XIN

XOUT

VPP

PGM

VDD

RESET

SDA

ROM CODE ACCESS PROTECTION

We would like to support a simple ROM code protection function

that prevents a party other than the ROM-code owner to read and

reprogram the built-in PROM code of the MCU.

First, Programmers must check the ID-code of the MCU.

If the ID-code is not blank, Programmer verifies it with the input ID-

code. When the ID-codes do not match, Programmer will reject all

further operations.

The MCU has each 10 bits of dedicated ROM spaces in address

009016 to 009616, as an ID-code (referred to as “the ID-code”) en-

abling a Programmer to verify with the input ID-code and validate

further operations.

Fig. 70 ROM-Code Protection ID Location

ID7

ID6

ID5

ID4

ID3

ID2

ID1

009716

009616

009516

009416

009316

009216

009116

009016

Address

4553 Datasheet(PDF) 141 Page - Renesas Technology Corp

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