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R8C/15 Datasheet(PDF) 254 Page - Renesas Technology Corp |
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R8C/15 Datasheet(HTML) 254 Page - Renesas Technology Corp |
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254 / 277 page  R8C/14 Group, R8C/15 Group 20. Precautions Rev.2.10 Jan 19, 2006 Page 242 of 253 REJ09B0164-0210 20.5 Serial Interface • When reading data from the U0RB (i = 0, 1) register even in the clock asynchronous serial I/O mode or in the clock synchronous serial I/O mode. Ensure to read data in 16-bit unit. When the high-order byte of the U0RB register is read, the PER and FER bits in the U0RB register and the RI bit in the U0C1 register are set to “0”. Example (when reading receive buffer register): MOV.W 00A6H,R0 ; Read the U0RB register • When writing data to the U0TB register in the clock asynchronous serial I/O mode with 9-bit transfer data length, write data high-order byte first, then low-order byte in 8-bit units. Example (when reading transmit buffer register): MOV.B #XXH,00A3H ; Write the high-order byte of U0TB register MOV.B #XXH,00A2H ; Write the low-order byte of U0TB register |
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