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M32C/86 Datasheet(PDF) 281 Page - Renesas Technology Corp |
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M32C/86 Datasheet(HTML) 281 Page - Renesas Technology Corp |
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281 / 505 page  Page 258 9 7 4 f o 5 0 0 2 , 8 0 . p e S 0 0 . 1 . v e R 0 0 1 0 - 4 0 2 0 B 9 0 J E R 20. CRC Calculation ) T 6 8 / C 2 3 M , 6 8 / C 2 3 M ( p u o r G 6 8 / C 2 3 M CRC Calculation and Setup Procedure to Generate CRC Code for "80C416" CRC Code : a remainder of a division, (1) Inverse a bit position of "80C416" per byte by program (2) Set "000016" (default value) CRCD register CRCD register CRCIN register Generator Polynomial : X 16 + X 12 + X 5 + 1 (1 0001 0000 0010 00012) value of the CRCIN register with inversed bit position generator polynomial CRC Calculation for M32C Setting Steps Details of CRC Calculation (3) Set "0116" "8016" "0116", "C416""2316" Bit position of the CRC code for "8016" (918816) is inversed to "118916", which is stored into the CRCD register in 3rd cycle. CRCD register Generator Polynomial data 0 + 0 = 0 0 + 1 = 1 1 + 0 = 1 1 + 1 = 0 - 1 = 1 CRCIN register (4) Set "2316" CRC Code 1 0001 0000 0010 0001 1000 1000 1000 0000 0000 0000 0000 0000 1000 1000 0001 0000 1 1000 0001 0000 1000 0 1000 1000 0001 0000 1 1001 0001 1000 1000 Bit position of the CRC code for "80C416" (825016) is inversed to "0A4116", which is stored into the CRCD register in 3rd cycle. As shown in (3) above, bit position of "0116" (000000012) written to the CRCIN register is inversed and becomes "100000002". Add "1000 0000 0000 0000 0000 00002", as "100000002" plus 16 digits, to "000016" as the default value of the CRCD register to perform the modulo-2 division. "0001 0001 1000 10012 (118916)", the remainder "1001 0001 1000 10002 (918816)" with inversed bit position, can be read from the CRCD register. When going on to (4) above, "2316 (001000112)" written in the CRCIN register is inversed and becomes "110001002". Add "1100 0100 0000 0000 0000 00002", as "110001002" plus 16 digits, to "1001 0001 1000 10002" as a remainder of (3) left in the CRCD register to perform the modulo-2 division. "0000 1010 0100 00012 (0A4116)", the remainder with inversed bit position, can be read from CRCD register. Modulo-2 Arithmetic is calculated on the law below. b15 b0 b15 b0 b7 b0 118916 b15 b0 b7 b0 0A4116 Figure 20.3 CRC Calculation |
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