M16CSLASH1N datasheet(129/238 Pages) RENESAS

129 / 238 page

Rev.1.00

Oct 20, 2004

page 117 of 222

M16C/1N Group

13. Serial I/O

REJ09B0007-0100Z

Microcomputer

TXD1 (P37)

CLKS (P34)

CLK1 (P36)

CLK

Note 1: This applies when the internal clock is selected and transmission

is performed only in clock synchronous serial I/O mode.

13.1.4 Continuous Receive Mode

If the continuous receive mode enable bit (bits 2 and 3 at address 00B016) is set to "1", the unit is

placed in continuous receive mode. In this mode, when the receive buffer register is read out, the unit

simultaneously goes to a receive enable state without having to set dummy data to the transmit buffer

13.1.5 RxD1 Input Pin Selection Function (UART1)

This function allows the setting two RxD1 input pins and choosing one of the two to input serial data by

using the RxD1 input pin select bit (bits 6 at address 00B016).

When selecting "1" (P35) for RxD1 input pin select bit, P37 functions as TxD1 output pin. When select-

ing "0" (P37), serial data output cannot be performed. However, P35 can be used as an input/output

port.

Figure 13.10 The transfer clock output from the multiple pins function usage

13.1.3 Transfer Clock Output from Multiple Pins Function (UART1)

This function allows the setting two transfer clock output pins and choosing one of the two to output a

clock by using the CLK and CLKS select bit (bits 4 and 5 at address 00B016). The multiple pins

function is valid only when the internal clock is selected for UART1.

Figure 13.10 shows the transfer clock output from the multiple pins function usage.

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