M16CSLASH26 datasheet(142/239 Pages) RENESAS

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Clock Asynchronous Serial I/O (UART) Mode

136

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

(b) TxD, RxD I/O polarity reverse function (UART2)

This function reverses/inverts TXD pin output and RXD pin input. The level of any data to be input or

output (including the start bit, stop bit(s), and parity bit) is reversed. Set this function to “0” (not re-

versed/inverted) for normal use.

This function samples the output level of the TXD pin and the input level of the RXD pin at the rising

edge of the transfer clock; if their values are different, then an interrupt request occurs. Figure 1.15.23

shows the example of detection timing of a bus collision (in UART mode).

Figure 1.15.23. Detection timing of a bus collision (in UART mode)

ST : Start bit

SP : Stop bit

Transfer clock

TxD2

RxD2

Bus collision detection

interrupt request signal

Bus collision detection

interrupt request bit

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