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M16C/1N датащи(PDF) 223 Page - Renesas Technology Corp |
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M16C/1N датащи(HTML) 223 Page - Renesas Technology Corp |
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223 / 238 page ![]() Rev.1.00 Oct 20, 2004 page 211 of 222 M16C/1N Group REJ090007-0100Z 20. Precautionary Notes in Using the Device 20.4 Serial I/O 1. When reading data from the UARTi receive buffer in the clock asynchronous serial I/O mode, data should be read high-byte first then low-byte using a byte-size. If data is read as low-byte then high- byte or in word-size the framing error and parity error flags are cleared. A code example is shown below. MOV.B 00A7H. R0H ; Read the high-byte of UART0 receive buffer register MOV.B 00A6H. R0L ; Read the low-byte of UART0 receive buffer register 2. When writing data to the UARTi transmit buffer register in the clock asynchronous serial I/O mode with 9-bit transfer data length, data should be written high-byte first then low-byte using a byte-size. A code example is shown below. MOV.B #XXH, 00A3H ; Write the high-byte of UART0 transmit buffer register MOV.B #XXH, 00A2H ; Write the low-byte of UART0 transmit buffer register |
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