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F21 数据表(PDF) 274 Page - Microchip Technology |
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F21 数据表(HTML) 274 Page - Microchip Technology |
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274 / 416 page  PIC24FJ256GA705 FAMILY DS30010118D-page 274 2016-2018 Microchip Technology Inc. REGISTER 22-1: CRCCON1: CRC CONTROL 1 REGISTER R/W-0 U-0 R/W-0 HSC/R-0 HSC/R-0 HSC/R-0 HSC/R-0 HSC/R-0 CRCEN — CSIDL VWORD4 VWORD3 VWORD2 VWORD1 VWORD0 bit 15 bit 8 HSC/R-0 HSC/R-1 R/W-0 HC/R/W-0 R/W-0 U-0 U-0 U-0 CRCFUL CRCMPT CRCISEL CRCGO LENDIAN — — — bit 7 bit 0 Legend: HC = Hardware Clearable bit HSC = Hardware Settable/Clearable bit R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15 CRCEN: CRC Enable bit 1 = Enables module 0 = Disables module; all state machines, pointers and CRCWDAT/CRCDAT registers reset; other SFRs are NOT reset bit 14 Unimplemented: Read as ‘0’ bit 13 CSIDL: CRC Stop in Idle Mode bit 1 = Discontinues module operation when device enters Idle mode 0 = Continues module operation in Idle mode bit 12-8 VWORD<4:0>: CRC Pointer Value bits Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN<4:0> 7 or 16 when PLEN<4:0> 7. bit 7 CRCFUL: CRC FIFO Full bit 1 = FIFO is full 0 = FIFO is not full bit 6 CRCMPT: CRC FIFO Empty bit 1 = FIFO is empty 0 = FIFO is not empty bit 5 CRCISEL: CRC Interrupt Selection bit 1 = Interrupt on FIFO is empty; the final word of data is still shifting through the CRC 0 = Interrupt on shift is complete and results are ready bit 4 CRCGO: Start CRC bit 1 = Starts CRC serial shifter 0 = CRC serial shifter is turned off bit 3 LENDIAN: Data Shift Direction Select bit 1 = Data word is shifted into the CRC, starting with the LSb (little endian) 0 = Data word is shifted into the CRC, starting with the MSb (big endian) bit 2-0 Unimplemented: Read as ‘0’ |
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