3802 datasheet(91/208 Pages) RENESAS

Il numero della parte	3802

Spiegazioni elettronici	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	208 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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2-33

3802 GROUP USER’S MANUAL

APPLICATION

2.3 Serial I/O

2.3.5 Serial I/O application examples

(1) Communication using a clock synchronous serial I/O (transmit/receive)

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Outline : 2-byte data is transmitted and received through the clock synchronous serial I/O. The SRDY

signal is used for communication control.

Figure 2.3.17 shows a connection diagram, and Figure 2.3.18 shows a timing chart.

Fig. 2.3.17 Connection diagram [Communication using a clock synchronous serial I/O]

Specifications : • The Serial I/O1 is used (clock synchronous serial I/O is selected)

• Synchronous clock frequency : 125 kHz (f(X IN) = 4 MHz is divided by 32)

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• The SRDY1 (receivable signal) is used.

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• The receiving side outputs the SRDY1 signal at intervals of 2 ms (generated by

timer), and 2-byte data is transferred from the transmitting side to the receiving

side.

Fig. 2.3.18 Timing chart [Communication using a clock synchronous serial I/O]

• • • •

TXD

SCLK1

SRDY1

2 ms

P41

/INT0

SCLK1

TXD

3802 group

SRDY1

SCLK

RXD

3802 group

Transmitting side

Receiving side

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