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R8C/13 Datasheet(PDF) 204 Page - Renesas Technology Corp |
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R8C/13 Datasheet(HTML) 204 Page - Renesas Technology Corp |
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204 / 224 page  R8C/13 Group 19. Usage Notes Rev.1.20 Jan 27, 2006 page 193 of 205 REJ09B0111-0120 19.5 Serial Interface (1) When reading data from the UiRB (i=0,1) register even in the clock asynchronous serial I/O mode or in the clock synchronous serial I/O mode. Be sure to read data in 16-bit unit. When the high-byte of the UiRB register is read, the PER and FER bits of the UiRB register and the RI bit of the UiC1 register are set to "0". Example (when reading receive buffer register): MOV.W 00A6H, R0 ; Read the U0RB register (2) When writing data to the UiTB 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 in 8-bit unit. Example (when reading transmit buffer register): MOV.B #XXH, 00A3H ; Write the high-byte of U0TB register MOV.B #XXH, 00A2H ; Write the low-byte of U0TB register |
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