Renesas 16-bit single-chip microcomputer Manual De Usuario

Rev.1.02 Jul 01, 2005 page 260 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

20. Flash Memory Version

Under development

This document is under development and its contents are subject to change.

20.4.2 Example of Circuit Application in Standard Serial I/O Mode

Figures 20.15 and 20.16 show example of circuit application in standard serial I/O mode 1 and mode 2,

respectively. Refer to the user’s manual of your serial programmer to handle pins controlled by a serial

programmer.

Note that when using the standard serial I/O mode 2, make sure a main clock input oscillation frequency

is set to 5 MHz, 10 MHz or 16 MHz.

Figure 20.15 Circuit Application in Standard Serial I/O Mode 1

Figure 20.16 Circuit Application in Standard Serial I/O Mode 2

Microcomputer

NOTES:

1. Control pins and external circuitry will vary according to programmer.

For more information, refer to the programmer manual.

2. In this example, modes are switched between single-chip mode and standard serial

I/O mode by controlling the CNVSS input with a switch.

3. If in standard standard serial I/O mode 1 there is a possibility that the user reset

signal will go low during standard serial I/O mode, break the connection between
the user reset signal and RESET pin by using, for example, a jumper switch.

SCLK input

BUSY output

TXD output

RXD input

Reset input

P6_4/RTS1

P6_6/CLK1

P6_7/TXD1

RESET

P6_6/RXD1

CNVSS

P5_0(CE)

P5_5(EPM)

P8_5/NMI

User reset
signal