38C3 datasheet(103/224 Pages) RENESAS

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38C3 Group User’s Manual

APPLICATION

2.3 Serial I/O

2.3.4 Serial I/O’s modes

38C3 Group can use clock synchronous serial I/O.

Figure 2.3.8 shows the serial I/O’s modes.

Fig. 2.3.8 Serial I/O’s modes

2.3.5 Serial I/O application examples

(1)

Communication (transmission/reception) using clock synchronous serial I/O

Outline : 2-byte data is transmitted and received, using the clock synchronous serial I/O.

The SRDY signal is used for communication control.

Figure 2.3.9 shows a connection diagram, and Figure 2.3.10 shows a timing chart.

Fig. 2.3.9 Connection diagram

Specifications : • Use of serial I/O in clock synchronous serial I/O

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

• Use of SRDY (receivable signal)

• The reception side outputs the SRDY signal at intervals of 2 ms (generated by the

timer), and 2-byte data is transferred from the transmission side to the reception

side.

Serial I/O

Clock synchronous serial I/O

Internal clock

External clock

Output SRDY signal

Not output SRDY signal

Select SCLK1 as synchronous clock output pin

Select SCLK2 as synchronous clock output pin

P55/INT0

SCLK1

SOUT

38C3 group

SRDY

SCLK1

SIN

38C3 group

38C3 Datasheet(PDF) 103 Page - Renesas Technology Corp