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PIC24FJ256GB108-I Datasheet, PDF (265/352 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit Flash Microcontrollers with USB On-The-Go (OTG) | |||
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PIC24FJ256GB110 FAMILY
21.3 Registers
There are four registers used to control programmable
CRC operation:
⢠CRCCON
⢠CRCXOR
⢠CRCDAT
⢠CRCWDAT
REGISTER 21-1: CRCCON: CRC CONTROL REGISTER
U-0
â
bit 15
U-0
R/W-0
R-0
R-0
â
CSIDL
VWORD4 VWORD3
R-0
VWORD2
R-0
VWORD1
R-0
VWORD0
bit 8
R-0
R-1
U-0
CRCFUL CRCMPT
â
bit 7
R/W-0
CRCGO
R/W-0
PLEN3
R/W-0
PLEN2
R/W-0
PLEN1
R/W-0
PLEN0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
â1â = Bit is set
U = Unimplemented bit, read as â0â
â0â = Bit is cleared
x = Bit is unknown
bit 15-14
bit 13
bit 12-8
bit 7
bit 6
bit 5
bit 4
bit 3-0
Unimplemented: Read as â0â
CSIDL: CRC Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
VWORD<4:0>: Pointer Value bits
Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN<3:0> > 7,
or 16 when PLEN<3:0> ï£ï 7.
CRCFUL: FIFO Full bit
1 = FIFO is full
0 = FIFO is not full
CRCMPT: FIFO Empty Bit
1 = FIFO is empty
0 = FIFO is not empty
Unimplemented: Read as â0â
CRCGO: Start CRC bit
1 = Start CRC serial shifter
0 = CRC serial shifter turned off
PLEN<3:0>: Polynomial Length bits
Denotes the length of the polynomial to be generated minus 1.
ï£ 2009 Microchip Technology Inc.
DS39897C-page 265
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