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H8SX/1663R Datasheet(PDF) 993 Page - Renesas Technology Corp |
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H8SX/1663R Datasheet(HTML) 993 Page - Renesas Technology Corp |
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993 / 1504 page ![]() Section 19 Serial Communication Interface (SCI, IrDA, CRC) Rev. 2.00 Sep. 24, 2008 Page 961 of 1468 REJ09B0412-0200 19.11.3 CRC Operation Circuit Operation The CRC operation circuit generates a CRC code for LSB-first/MSB-first communications. An example in which a CRC code for hexadecimal data H'F0 is generated using the X 16 + X12 + X5 + 1 polynomial with the G1 and G0 bits in CRCCR set to B'11 is shown below. CRCCR CRCDORH CRCDORL CRCDOR clearing 1. Write H'83 to CRCCR 1 7 0 0 0 00 0 7 0 7 0 7 0 1 1 0 0 0 0 0 00 0 0 0 0 0 0 00 0 CRCDIR CRCDORH CRCDORL CRC code generation 2. Write H'F0 to CRCDIR 1 1 1 1 0 00 0 1 1 1 1 0 11 1 1 0 0 0 1 11 1 CRC code = H'F78F CRC code Output Data 3. Read from CRCDOR 7 7 7 FF F 0 8 7 00 0 4. Serial transmission (LSB first) 1 1 1 1 0 1 1 1 1 0 0 0 1 11 1 1 1 1 1 0 00 0 Figure 19.44 LSB-First Data Transmission CRCCR CRCDORH CRCDORL CRCDOR clearing 1. Write H'87 to CRCCR 1 7 0 0 0 01 0 7 0 7 0 7 0 1 1 0 0 0 0 0 00 0 0 0 0 0 0 00 0 CRCDIR CRCDORH CRCDORL CRC code generation 2. Write H'F0 to CRCDIR 1 1 1 1 0 00 0 1 1 1 0 1 11 1 0 0 0 1 1 11 1 CRC code = H'EF1F CRC code Output Data 3. Read from CRCDOR 7 7 0 FF 1 F E 7 00 0 4. Serial transmission (MSB first) 1 1 1 1 0 0 0 0 1 1 1 0 1 11 1 0 0 0 1 1 11 1 Figure 19.45 MSB-First Data Transmission |
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