M38040F2HKP datasheet(185/387 Pages) RENESAS

185 / 387 page

2-61

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

2.4.7 Serial I/O application examples

(1)

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

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

The SRDY1 signal is used for communication control.

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

Figure 2.4.21 shows a registers setting relevant to the transmitting side, and Figure 2.4.22 shows

registers setting relevant to the receiving side.

Fig. 2.4.19 Connection diagram

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

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

• SRDY1 (receivable signal) is used.

• The receiving side outputs 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. 2.4.20 Timing chart (using clock synchronous serial I/O)

P42

/INT1

SCLK1

TXD1

SRDY1

SCLK1

RXD1

Transmitting side

Receiving side

Note: Use SOUT2 and SIN2 instead of TxDi and RxDi for the serial I/O2. (i = 1, 3)

3804 group

(Spec. H)

3804 group

(Spec. H)

SRDY1

SCLK1

TXD

D1 D2 D3

D4 D5 D6

D0 D1 D2

D3 D4 D5

D0 D1

2 ms

....

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