R8CSLASH15 datasheet(224/277 Pages) RENESAS

224 / 277 page

R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 212 of 253

REJ09B0164-0210

18.5

Standard Serial I/O Mode

In standard serial I/O mode, the user ROM area can be rewritten while the microcomputer is mounted

on-board by using a serial programmer which is applicable for this microcomputer.

Standard serial I/O mode is used to connect with a serial writer using a special clock asynchronous serial

I/O.

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 microcomputer uses Standard serial I/O mode 2 and Standard serial I/O mode 3.

Refer to Appendix 2. Connecting Example between Serial Writer and On-Chip Debugging

Emulator.

Contact the manufacturer of your serial programmer for serial programmer. Refer to the

user’s manual of your serial programmer for details on how to use it.

Table 18.7 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 2), Table 18.8 lists the Pin

Functions (Flash Memory Standard Serial I/O Mode 3). Figure 18.15 show Pin Connections for Standard

Serial I/O Mode 3.

After processing the pins shown in Table 18.8 and rewriting a flash memory using a writer, apply “H” to

the MODE pin and reset a hardware if a program is operated on the flash memory in single-chip mode.

18.5.1

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 18.3 Functions To Prevent Flash Memory from

Rewriting

Table 18.7

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

Name

I/O

Description

VCC,VSS

Power input

Apply the voltage guaranteed for program and erase to

VCC pin and 0V to VSS pin.

RESET

Reset input

Reset input pin.

P4_6/XIN

P4_6 input/clock input

Connect ceramic resonator or crystal oscillator

between XIN and XOUT pins.

P4_7/XOUT

P4_7 input/clock output

I/O

AVCC, AVSS

Analog power supply input I

Connect AVSS to VSS and AVCC to VCC, respectively.

P1_0 to P1_7

Input port P1

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

VREF

Reference voltage input

Reference voltage input pin to A/D converter.

P3_3 to P3_5

Input port P3

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

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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