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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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M30620FCAFP 데이터시트(PDF) 160 Page - Mitsubishi Electric Semiconductor |
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M30620FCAFP 데이터시트(HTML) 160 Page - Mitsubishi Electric Semiconductor |
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160 / 274 page  Mitsubishi microcomputers M16C / 62A Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER CRC 160 b15 b0 (1) Setting 000016 CRC data register CRCD [03BD16, 03BC16] b0 b7 b15 b0 (2) Setting 0116 CRC input register CRCIN [03BE16] 2 cycles After CRC calculation is complete CRC data register CRCD [03BD16, 03BC16] 118916 Stores CRC code b0 b7 b15 b0 (3) Setting 2316 CRC input register CRCIN [03BE16] After CRC calculation is complete CRC data register CRCD [03BD16, 03BC16] 0A4116 Stores CRC code The code resulting from sending 0116 in LSB first mode is (1000 0000). Thus the CRC code in the generating polynomial, (X16 + X12 + X5 + 1), becomes the remainder resulting from dividing (1000 0000) X16 by (1 0001 0000 0010 0001) in conformity with the modulo-2 operation. Thus the CRC code becomes (1001 0001 1000 1000). Since the operation is in LSB first mode, the (1001 0001 1000 1000) corresponds to 118916 in hexadecimal notation. If the CRC operation in MSB first mode is necessary in the CRC operation circuit built in the M16C, switch between the LSB side and the MSB side of the input-holding bits, and carry out the CRC operation. Also switch between the MSB and LSB of the result as stored in CRC data. 1 0001 0000 0010 0001 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 1000 1000 LSB MSB LSB MSB 98 1 1 Modulo-2 operation is operation that complies with the law given below. 0 + 0 = 0 0 + 1 = 1 1 + 0 = 1 1 + 1 = 0 -1 = 1 Figure 1.19.3. Calculation example using the CRC calculation circuit |
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