R8CSLASH15 datasheet(207/277 Pages) RENESAS

207 / 277 page

R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 195 of 253

REJ09B0164-0210

18.3

Functions To Prevent Flash Memory from Rewriting

Standard serial I/O mode contains an ID code check function, and the parallel I/O mode contains a ROM

code protect function to prevent the flash memory from reading or rewriting easily.

18.3.1

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 determined whether they

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

acknowledged. The ID code consists of 8-bit data, the areas of which, beginning with the first byte,

are 00FFDFh, 00FFE3h, 00FFEBh, 00FFEFh, 00FFF3h, 00FFF7h, and 00FFFBh. Write a program in

which the ID codes are set at these addresses and write it in the flash memory.

Figure 18.3

Address for ID Code Stored

4 bytes

Address

00FFDFh to 00FFDCh

Undefined Instruction Vector

NOTES:

1. The OFS register is assigned to 00FFFFh. Refer to

Figure 12.2 OFS, WDC, WDTR and WDTS registers for

the OFS register details.

Overflow Vector

00FFE3h to 00FFE0h

00FFE7h to 00FFE4h

BRK Instruction Vector

Address Match Vector

00FFEBh to 00FFE8h

00FFEFh to 00FFECh

Oscillation Stop Detection/Watchdog

Timer/Voltage Monitor 2 Vector

00FFF3h to 00FFF0h

00FFF7h to 00FFF4h

Address Break

00FFFBh to 00FFF8h

Reset Vector

00FFFFh to 00FFFCh

(Reserved)

ID1

ID2

ID3

ID4

ID5

ID6

ID7

(Note 1)

Single Step Vector

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