R8C datasheet(152/199 Pages) RENESAS

152 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 142 of 180

REJ09B0019-0120

17.3 Functions To Prevent Flash Memory from Rewriting

To prevent the flash memory from being read or rewritten easily, standard serial I/O mode has an ID code

check function.

17.3.1 ID Code Check Function

Use this function in standard serial I/O mode. Unless the flash memory is blank, the ID codes sent

from the programmer and the ID codes written in the flash memory are compared to see if they match.

If the ID codes do not match, the commands sent from the programmer are not accepted. The ID code

consists of 8-bit data, the areas of which, beginning with the first byte, are 00FFDF16, 00FFE316,

00FFEB16, 00FFEF16, 00FFF316, 00FFF716, and 00FFFB16. Prepare a program in which the ID

codes are preset at these addresses and write it in the flash memory.

Figure 17.2 Address for ID Code Stored

Reset vector

Oscillation stop detection/

watchdog timer vector/

Single step vector

Address match vector

BRK instruction vector

Overflow vector

Undefined instruction vector

ID7

ID6

ID5

ID4

ID3

ID2

ID1

(Reserved)

00FFFF16 to 00FFFC16

00FFFB16 to 00FFF816

00FFF716 to 00FFF416

00FFF316 to 00FFF016

00FFEF16 to 00FFEC16

00FFEB16 to 00FFE816

00FFE716 to 00FFE416

00FFE316 to 00FFE016

00FFDF16 to 00FFDC16

4 bytes

Address

(Note 1)

NOTES:

1. When write to address 00FFFF16, write “FF16”.

17.3 Functions to Prevent Flash Memory from Rewriting

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