R8C datasheet(170/199 Pages) RENESAS

170 / 199 page

R8C/10 Group

17.5 Standard Serial I/O Mode

Rev.1.20 Jan 27, 2006

page 160 of 180

REJ09B0019-0120

Data input

Data output

TxD

CNVss

RxD

Microcomputer

(1) In this example, modes are switched between single-chip mode and standard

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

(2) Connecting the oscillation is necessary. Set the main clock frequency 1MHz to

20 MHz. Refer to "Appendix 2.2 Connecting examples with M16C Flash

Starter (M3A-0806)".

MODE

• Example of Circuit Application in the Standard Serial I/O Mode

Figures 17.14 and 17.15 show examples of circuit application in standard serial I/O mode 1 and

mode 2, respectively. Refer to the serial programmer manual of your programmer to handle pins

controlled by the programmer.

Figure 17.14 Circuit Application in Standard Serial I/O Mode 1

MODE

I/O

Data output

CNVss input

Data input

TxD

MODE

CNVss

RESET

RxD

Reset input

User reset

signal

Microcomputer

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

For more information, see the programmer manual.

(2) In this example, modes are switched between single-chip mode and

standard serial I/O mode by connecting a programmer.

(3) When operating with an on-chip oscillator clock, connecting the oscillation circuit is

not necessary. Refer to "Appendix figure 2.1 Connecting Examples with USB

Flash Writer (M3A-0665)".

Figure 17.15 Circuit Application in Standard Serial I/O Mode 2

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