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Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-8

2.4.5 Precautions for Serial I/O (in clock-synchronous serial I/O)

Transmission/reception

_______ ________

(1) With an external clock selected, and choosing the RTS function, the output level of the RTSi

pin goes to “L” when the data-receivable status becomes ready, which informs the transmis-

________

sion side that the reception has become ready. The output level of the RTSi pin goes to “H”

________ ________

when reception starts. So if the RTSi pin is connected to the CTSi pin on the transmission

side, the circuit can transmission and reception data with consistent timing. With the internal

_______

clock, the RTS function has no effect. Figure 2.4.16 shows an example of wiring.

Figure 2.4.16. Example of wiring

TxD

RxD

CLK

CTS

TxD

RxD

CLK

RTS

Transmitter side IC

Receiver side IC

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