38K2 datasheet(202/358 Pages) RENESAS

Part #	38K2

Description	RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	358 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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202 / 358 page

2.4 Serial I/O

Rev.2.00

Oct 15, 2006

page 53 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

(2)

Output of serial data (control of peripheral IC)

Outline : 4-byte data is transmitted and received, using the clock synchronous serial I/O.

The CS signal is output to a peripheral IC through port P53.

The example for using Serial I/O is shown.

Figure 2.4.19 shows a connection diagram, and Figure 2.4.20 shows a timing chart.

Fig. 2.4.19 Connection diagram

Specifications : • The Serial I/O is used (clock synchronous serial I/O is selected.)

• Synchronous clock frequency : 125 kHz (f(XIN) = 6 MHz is divided by 48)

• Transfer direction : LSB first

• The Serial I/O interrupt is not used.

• Port P53 is connected to the CS pin (“L” active) of the peripheral IC for transmission

control; the output level of port P53 is controlled by software.

Fig. 2.4.20 Timing chart

SCLK

Peripheral IC

38K2 group

Example for using Serial I/O

DATA

CLK

DATA

P53

TXD

DO0

DO1

DO2

DO3

CLK

DATA

38K2 Datasheet(PDF) 202 Page - Renesas Technology Corp