Renesas R8C/Tiny Series Manual descarregar pdf (Página 152)

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 vecto

Undefined instruction vector

ID7

ID6

ID5

ID4

ID3

ID2

ID1

(Reserved)

(

)

00FFE3

to 00FFE0

00FFDF

to 00FFDC

4 bytes

Address

ote 1

)

“

”

17.3 Functions to Prevent Flash Memory from Rewriting

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 198 199

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