PIC24EP256GU810-I Datasheet, PDF (463/622 Pages) Electronic Film Capacitors, Inc. – 16-Bit Microcontrollers and Digital Signal Controllers with High-Speed PWM, USB and Advanced Analog

dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
27.3 Programmable CRC Registers
REGISTER 27-1: CRCCON1: CRC CONTROL REGISTER 1
R/W-0
U-0
R/W-0
R-0
CRCEN
—
CSIDL
bit 15
R-0
R-0
R-0
VWORD<4:0>
R-0
bit 8
R-0
R-1
R/W-0
R/W-0
R/W-0
U-0
CRCFUL
CRCMPT CRCISEL CRCGO LENDIAN
—
bit 7
U-0
U-0
—
—
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
bit 14
bit 13
bit 12-8
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
CRCEN: CRC Enable bit
1 = CRC module is enabled
0 = CRC module is disabled, all state machines, pointers and CRCWDAT/CRCDAT are reset; other
SFRs are not reset
Unimplemented: Read as ‘0’
CSIDL: CRC Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues 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<4:0> > 7 or
16 when PLEN<4:0> 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
CRCISEL: CRC Interrupt Selection bit
1 = Interrupt on FIFO is empty; final word of data is still shifting through CRC
0 = Interrupt on shift is complete and CRCWDAT results are ready
CRCGO: Start CRC bit
1 = Starts CRC serial shifter
0 = CRC serial shifter is turned off
LENDIAN: Data Word Little-Endian Configuration 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)
Unimplemented: Read as ‘0’
 2009-2012 Microchip Technology Inc.
DS70616G-page 463