PIC24HJ32GP302_11 Datasheet, PDF (249/368 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04
23.4 Registers
The CRC module provides the following registers:
• CRC Control Register
• CRC XOR Polynomial Register
REGISTER 23-1: CRCCON: CRC CONTROL REGISTER
U-0
—
bit 15
U-0
R/W-0
R-0
R-0
—
CSIDL
R-0
R-0
VWORD<4:0>
R-0
bit 8
R-0
R-1
U-0
CRCFUL CRCMPT
—
bit 7
R/W-0
CRCGO
R/W-0
R/W-0
R/W-0
PLEN<3:0>
R/W-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 15-14
bit 13
bit 12-8
bit 7
bit 6
bit 5
bit 4
bit 3-0
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> is
greater than 7, or 16 when PLEN<3:0> is less than or equal to 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 ‘0’
CRCGO: Start CRC bit
1 = Start CRC serial shifter
0 = Turn off CRC serial shifter after FIFO is empty
PLEN<3:0>: Polynomial Length bits
Denotes the length of the polynomial to be generated minus 1.
© 2011 Microchip Technology Inc.
DS70293E-page 249