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M30620FCAFP 数据表(PDF) 131 Page - Mitsubishi Electric Semiconductor |
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M30620FCAFP 数据表(HTML) 131 Page - Mitsubishi Electric Semiconductor |
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131 / 274 page  Clock asynchronous serial I/O (UART) mode Mitsubishi microcomputers M16C / 62A Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 131 (c) TxD, RxD I/O polarity reverse function (UART2) This function is to reverse 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 to reverse) for usual use. (d) Bus collision detection function (UART2) This function is to sample 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 1.16.21 shows the example of detection timing of a bus collision (in UART mode). Figure 1.16.21. Detection timing of a bus collision (in UART mode) ST : Start bit SP : Stop bit ST ST SP SP Transfer clock TxD2 RxD2 Bus collision detection interrupt request signal “H” “L” “H” “L” “H” “L” “1” “0” Bus collision detection interrupt request bit “1” “0” |
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