R8CSLASH20 datasheet(419/501 Pages) RENESAS

419 / 501 page

R8C/20 Group, R8C/21 Group

19. Flash Memory

Rev.2.00 Aug 27, 2008

Page 403 of 458

REJ09B0250-0200

19.5.1.1

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

Figure 19.18 shows an example of Pin Processing in Standard Serial I/O Mode 2 and Figure 19.19 shows an

example of Pin Processing in Standard Serial I/O Mode 3. Since the controlled pins vary depending on the

programmer, refer to the manual of your serial programmer.

Figure 19.18

Pin Processing in Standard Serial I/O Mode 2

Figure 19.19

Pin Processing in Standard Serial I/O Mode 3

NOTES:

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 1

MHz to 20 MHz. Refer to Appendix Figure 2.1 Connection Example

with M16C Flash Starter (M3A-0806).

MCU

TXD

RXD

Data output

Data input

MODE

NOTES:

1. Controlled pins and external circuits vary depending on the

programmer. Refer to the programmer manual for details.

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 on-chip oscillator clock, connecting the oscillating

circuit is not necessary.

MCU

MODE

RESET

User reset signal

MODE I/O

Reset input

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