R8C2K datasheet(409/471 Pages) RENESAS

409 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 392 of 450

REJ09B0406-0110

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 2 and standard serial I/O mode 3.

Refer to Appendix 2. Connection Examples between Serial Writer and 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 2) and Figure 20.25 shows an Example

of Pin Processing in Standard Serial I/O Mode 2. Table 20.8 lists the Pin Functions (Flash Memory Standard Serial

I/O Mode 3) and Figure 20.26 shows an Example of Pin Processing in Standard Serial I/O Mode 3.

After processing the pins shown in Table 20.8 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 13. ID Code Areas for details of the ID code check.

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