R8CSLASH2G datasheet(286/344 Pages) RENESAS

286 / 344 page

R8C/2G Group

20. Flash Memory

Rev.1.00

Apr 04, 2008

Page 266 of 318

REJ09B0387-0100

20.5

Standard Serial I/O Mode

In standard serial I/O mode, the user ROM area can be rewritten while the MCU is mounted on-board by using a

serial programmer which is suitable for the MCU.

There are three types of standard serial I/O modes:

• Standard serial I/O mode 1 ............Clock synchronous serial I/O used to connect with a serial programmer

• Standard serial I/O mode 2 ............Clock asynchronous serial I/O used to connect with a serial programmer

• Standard serial I/O mode 3 ............Special clock asynchronous serial I/O used to connect with a serial

programmer

This MCU uses Standard serial I/O mode 3.

Refer to Appendix 2. Connection Examples with On-Chip Debugging Emulator. Contact the manufacturer of

your serial programmer for details. Refer to the user’s manual of your serial programmer for instructions on how to

use it.

Table 20.7 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 3), and Figure 20.16 shows an

Example of Pin Processing in Standard Serial I/O Mode 3.

After processing the pins shown in Table 20.7 and rewriting the flash memory using the programmer, apply “H” to

the MODE pin and reset the hardware to run a program in the flash memory in single-chip mode.

20.5.1

ID Code Check Function

The ID code check function determines whether the ID codes sent from the serial programmer and those written

in the flash memory match.

Refer to 14. ID Code Areas for details of the ID code check.

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