M30620FCAFP datasheet(370/615 Pages) RENESAS

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Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-53

_______ _______

The clock-synchronous serial I/O has three types of CTS/RTS functions to choose from:

_______ _______

• CTS/RTS functions disabled

_______ _______

CTS/RTS pin is a programmable I/O port.

_______

• CTS function only enabled

_______ _______

_______

CTS/RTS pin performs the CTS function.

_______

• RTS function only enabled

_______ _______

_______

CTS/RTS pin performs the RTS function.

(b) Function for choosing polarity

This function switches the polarity of the transfer clock. The following operations are available:

• Data is input at the falling edge of the transfer clock, and is output at the rising edge.

• Data is input at the rising edge of the transfer clock, and is output at the falling edge.

This function is to choose whether to transmit data from bit 0 or from bit 7. Choose either of the

following:

• LSB first

Data is transmitted from bit 0.

• MSB first

Data is transmitted from bit 7.

(d) Function for choosing successive reception mode

Successive reception mode is a mode in which reading the receive buffer register makes the recep-

tion-enabled status ready. In this mode, there is no need to write dummy data to the transmit buffer

the receive buffer register into a dummy manner.

• Normal mode

Writing dummy data to the transmit buffer register makes the

reception enabled status ready.

• Successive reception mode

Reading the reception buffer register makes the reception-enabled

status ready.

(e) Function for outputting transfer clock to multiple pins

This function is to switch among pins to output the transfer clock. This function is effective only when

selecting the internal clock. Switching among pins for outputting the transfer clock allows data trans-

mission to two external ICs in a time-sharing manner.

(f) Data logic select function

This function is to reserve data when writing to transmit buffer register or reading from receive buffer register.

(g) Function for choosing a transmission interrupt factor

The timing to generate a transmission interrupt can be selected from the following: the instant the

transmission buffer is emptied or the instant the transmission register is emptied. When transmis-

sion buffer empty timing is selected, an interrupt occurs when transmitted data is moved from the

transmission buffer to the transmission register. Therefore, data can be transmitted in succession.

When transmission register empty timing is selected, an interrupt occurs when data transmission is

complete.

(h) TxD, RxD I/O polarity reverse function

This function is to reserve a polarity of TxD port output level and a polarity of RxD port input level.

M30620FCAFP Datasheet(PDF) 370 Page - Renesas Technology Corp

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