PIC24FV32KA304-I Datasheet, PDF (206/320 Pages) Microchip Technology – 20/28/44/48-Pin, General Purpose, 16-Bit Flash Microcontrollers with XLP Technology

PIC24FV32KA304 FAMILY
REGISTER 20-1: CRCCON1: CRC CONTROL REGISTER 1
R/W-0
U-0
CRCEN
—
bit 15
R/W-0
CSIDL
R-0
VWORD4
R-0
VWORD3
R-0
VWORD2
R-0
VWORD1
R-0
VWORD0
bit 8
R-0, HCS R-1, HCS
R/W-0
R/W-0, HC
R/W-0
U-0
U-0
CRCFUL CRCMPT
CRCISEL
CRCGO
LENDIAN
—
—
bit 7
U-0
—
bit 0
Legend:
R = Readable bit
-n = Value at POR
HC = Hardware Clearable bit
W = Writable bit
‘1’ = Bit is set
HCS = Hardware Clearable/Settable bit
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 = Module is enabled
0 = Module is enabled. 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 = 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> 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; CRC calculation is not complete
0 = Interrupt on shift is complete and CRCWDAT result is ready
CRCGO: Start CRC bit
1 = Start CRC serial shifter
0 = CRC serial shifter is turned off
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)
Unimplemented: Read as ‘0’
DS39995B-page 206
 2011 Microchip Technology Inc.