M38K09RFS datasheet(189/328 Pages) RENESAS

tên linh kiện	M38K09RFS

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2.4 Serial I/O

Rev.2.00

Oct 05, 2006

page 60 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

(4)

Communication (transmit/receive) using asynchronous serial I/O (UART)

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

Port P20 is used for communication control.

Figure 2.4.29 shows a connection diagram, and Figure 2.4.30 shows a timing chart.

Fig. 2.4.29 Connection diagram (Communication using UART)

Specifications : • The Serial I/O is used (UART is selected).

• Transfer bit rate : 9600 bps (f(XIN) = 6 MHz is divided by 624)

• Communication control using port P20

(The output level of port P20 is controlled by software.)

• 2-byte data is transferred from the transmitting side to the receiving side at intervals

of 10 ms generated by the timer.

Fig. 2.4.30 Timing chart (using UART)

Transmitting side

P20

38K0 group

P20

38K0 group

Receiving side

TXDRXD

P20

10 ms

D0 D1 D2 D3

D4 D5 D6 D7

SP(2)

D1 D2 D3 D4 D5 D6

SP(2)

.....

TXD

.....

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