R8C2K datasheet(140/471 Pages) RENESAS

140 / 471 page

R8C/2K Group, R8C/2L Group

13. ID Code Areas

Rev.1.10

Dec 21, 2007

Page 123 of 450

REJ09B0406-0110

13. ID Code Areas

13.1

Overview

The ID code areas are used to implement a function that prevents the flash memory from being rewritten in

standard serial I/O mode. This function prevents the flash memory from read, rewritten, or erased.

The ID code areas are assigned to 0FFDFh, 0FFE3h, 0FFEBh, 0FFEFh, 0FFF3h, 0FFF7h, and 0FFFBh of the

respective vector highest-order addresses of the fixed vector table. Figure 13.1 shows the ID Code Areas.

Figure 13.1

ID Code Areas

13.2

Functions

The ID code areas are used in standard serial I/O mode. Unless 3 bytes (addresses from 0FFFCh to 0FFFEh) of the

reset vector are set to FFFFFFh, the ID codes stored in the ID code areas and the ID codes sent from the serial

programmer or the on-chip debugging emulator are checked to see if they match. If the ID codes match, the

commands sent from the serial programmer or the on-chip debugging emulator are acknowledged. If the ID codes

do not match, the commands are not acknowledged. To use the serial programmer or the on-chip debugging

simulator, first write predetermined ID codes to the ID code areas.

As the ID code areas are allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an

instruction. Write appropriate values when creating a program.

4 bytes

Address

Oscillation stop detection/watchdog timer/

voltage monitor 1 and voltage monitor 2

(Reserved)

Undefined instruction vector

Overflow vector

BRK instruction vector

Address match vector

Single step vector

Address break vector

Reset vector

ID code areas

ID1

ID2

ID3

ID4

ID5

ID6

ID7

OFS

0FFDFh to 0FFDCh

0FFE3h to 0FFE0h

0FFE7h to 0FFE4h

0FFEBh to 0FFE8h

0FFEFh to 0FFECh

0FFF3h to 0FFF0h

0FFF7h to 0FFF4h

0FFFBh to 0FFF8h

0FFFFh to 0FFFCh

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