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DSPIC33FJ32GP302TH/SP Datasheet(PDF) 289 Page - Microchip Technology

Part # DSPIC33FJ32GP302TH/SP
Description  High-Performance, 16-bit Digital Signal Controllers
PDF  403 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DSPIC33FJ32GP302TH/SP Datasheet(HTML) 289 Page - Microchip Technology

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 2009 Microchip Technology Inc.
Preliminary
DS70292D-page 289
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
25.4
Registers
The CRC module provides the following registers:
• CRC Control Register
• CRC XOR Polynomial Register
REGISTER 25-1:
CRCCON: CRC CONTROL REGISTER
U-0
U-0
R/W-0
R-0
R-0
R-0
R-0
R-0
—
—
CSIDL
VWORD<4:0>
bit 15
bit 8
R-0
R-1
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CRCFUL
CRCMPT
—
CRCGO
PLEN<3:0>
bit 7
bit 0
Legend:
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 15-14
Unimplemented: Read as ‘0’
bit 13
CSIDL: CRC Stop in Idle Mode bit
1
= Discontinue module operation when device enters Idle mode
0
= Continue module operation in Idle mode
bit 12-8
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.
bit 7
CRCFUL: FIFO Full bit
1
= FIFO is full
0
= FIFO is not full
bit 6
CRCMPT: FIFO Empty bit
1
= FIFO is empty
0
= FIFO is not empty
bit 5
Unimplemented: Read as ‘0’
bit 4
CRCGO: Start CRC bit
1
= Start CRC serial shifter
0
= Turn off CRC serial shifter after FIFO is empty
bit 3-0
PLEN<3:0>: Polynomial Length bits
Denotes the length of the polynomial to be generated minus 1.



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