7733 datasheet(435/940 Pages) RENESAS

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APPLICATIONS

7733 Group User’s Manual

17–28

17.2 Serial I/O

Examples for serial I/O are described below:

•Examples where the microcomputer is connected with an external device by using serial I/O

•Examples where serial data is transmitted and received

17.2.1 Connection examples with external device (Clock synchronous serial I/O mode)

(1) Connection with peripheral ICs

17.2 Serial I/O

Fig. 17.2.2 Example where transmission/recep-

tion is performed

Fig. 17.2.1 Example where only transmission is

performed

Fig. 17.2.3 Example where transmission/reception is performed (Connection example with wired-

OR)

CLKi

TXDi

CLK

M37733MHBXXXFP

Peripheral IC

(OSD controller and so on)

CLKi

TXDi

RXDi

CLK

OUT

M37733MHBXXXFP

Peripheral IC

(E PROM and so on)

CLKi

TXDi

RXDi

CLK

OUT

M37733MHBXXXFP

Peripheral IC

(E PROM and so on)

g Set pin TxDi to N-channel open-drain output.

UART0: Data output selection bit ( bit 5 at address 34 16)

“1”

UART1: Data output selection bit ( bit 5 at address 3C 16)

“1”

When receiving, be sure to set pin TxD i’s output to “H” level.

(Pin RxDi is in a floating state.)

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