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H8SX/1663 数据表(PDF) 740 Page - Renesas Technology Corp |
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H8SX/1663 数据表(HTML) 740 Page - Renesas Technology Corp |
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740 / 1158 page ![]() Section 15 Serial Communication Interface (SCI, IrDA, CRC) Rev.1.00 Jun. 07, 2006 Page 688 of 1102 REJ09B0294-0100 15.3.10 Serial Extended Mode Register (SEMR_2) SEMR_2 selects the clock source in asynchronous mode of SCI_2. The base clock is automatically specified when the average transfer rate operation is selected. 7 Undefined R 6 Undefined R 5 Undefined R 4 Undefined R Bit Bit Name Initial Value R/W 3 ABCS 0 R/W 2 ACS2 0 R/W 1 ACS1 0 R/W 0 ACS0 0 R/W Bit Bit Name Initial Value R/W Description 7 to 4 Undefined R Reserved These bits are always read as undefined and cannot be modified. 3 ABCS 0 R/W Asynchronous Mode Base clock Select (valid only in asynchronous mode) Selects the base clock for a 1-bit period. 0: The base clock has a frequency 16 times the transfer rate 1: The base clock has a frequency 8 times the transfer rate |
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