R28 datasheet(382/473 Pages) RENESAS

382 / 473 page

R8C/28 Group, R8C/29 Group

19. Flash Memory

Rev.2.10

Sep 26, 2008

Page 363 of 441

REJ09B0279-0210

19.5

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 19.7 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 2), Table 19.8 lists the Pin Functions

(Flash Memory Standard Serial I/O Mode 3), and Figure 19.17 shows the Pin Connections for Standard Serial I/O

Mode 3.

After processing the pins shown in Table 19.8 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.

19.5.1

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 19.3 Functions to Prevent Rewriting of Flash Memory).

Table 19.7

Pin Functions (Flash Memory Standard Serial I/O Mode 2)

Name

I/O

Description

VCC,VSS

Power input

Apply the voltage guaranteed for programming and

erasure to the VCC pin and 0 V to the VSS pin.

RESET

Reset input

Reset input pin.

P4_6/XIN/XCIN

P4_6 input/clock input

Connect a ceramic resonator or crystal oscillator

between the XIN/XCIN and XOUT/XCOUT pins.

P4_7/XOUT/XCOUT P4_7 input/clock output

I/O

P1_0 to P1_7

Input port P1

Input “H” or “L” level signal or leave the pin open.

P3_3 to P3_5

Input port P3

P4_2/VREF

Input port P4

MODE

I/O Input “L”.

P3_7

TXD output

Serial data output pin.

P4_5

RXD input

Serial data input pin.

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