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MRF39RA датащи(PDF) 39 Page - Microchip Technology |
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MRF39RA датащи(HTML) 39 Page - Microchip Technology |
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39 / 72 page ![]() 2015 Microchip Technology Inc. DS40001778B-page 39 MRF39RA 4.5.6.4 CRC-Based The CRC check is enabled by setting bit CrcOn in RegPacketConfig1. It is used for checking the integrity of the message. The checksum is calculated on the received payload and compared with the two checksum bytes received. The result of the comparison is stored in bit CrcOk. By default if the CRC check fails then the FIFO is automatically cleared and no interrupt is generated. This filtering function can be disabled via CrcAutoClearOff bit and in this case, even if CRC fails, the FIFO is not cleared and only PayloadReady interrupt goes high. Note that in both cases, the two CRC checksum bytes are stripped off by the packet handler and only the payload is made available in the FIFO. The CRC is based on the CCITT polynomial, see Figure 4-12. This implementation also detects errors due to leading and trailing zeros. FIGURE 4-12: CRC IMPLEMENTATION X 14 X 13 X 12 X11 X 5 X0 X15 CRC Po lyn om ial = X16 + X12 + X5 + 1 * * * X 4 * * * data in pu t |
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