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PIC24FJ128GA310 Datasheet(PDF) 289 Page - Microchip Technology

Part # PIC24FJ128GA310
Description  64/80/100-Pin, General Purpose, 16-Bit Flash Microcontrollers with LCD Controller and nanoWatt XLP Technology
PDF  406 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC24FJ128GA310 Datasheet(HTML) 289 Page - Microchip Technology

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 2010-2011 Microchip Technology Inc.
DS39996F-page 289
PIC24FJ128GA310 FAMILY
23.0
32-BIT PROGRAMMABLE
CYCLIC REDUNDANCY CHECK
(CRC) GENERATOR
The 32-bit programmable CRC generator provides a
hardware implemented method of quickly generating
checksums for various networking and security
applications. It offers the following features:
• User-programmable CRC polynomial equation,
up to 32 bits
• Programmable shift direction (little or big-endian)
• Independent data and polynomial lengths
• Configurable interrupt output
• Data FIFO
Figure 23-1 displays a simplified block diagram of the
CRC generator. A simple version of the CRC shift
engine is displayed in Figure 23-2.
FIGURE 23-1:
CRC BLOCK DIAGRAM
FIGURE 23-2:
CRC SHIFT ENGINE DETAIL
Note:
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F
Family
Reference
Manual
”,
Section
41.
“32-Bit
Programmable
Cyclic
Redundancy
Check
(CRC)”
(DS39729). The information in this data
sheet supersedes the information in the
FRM.
CRC
Interrupt
Variable FIFO
(4x32, 8x16 or 16x8)
CRCDATH
CRCDATL
Shift Buffer
CRC Shift Engine
CRCWDATH
CRCWDATL
Shifter Clock
2 * FCY
LENDIAN
CRCISEL
1
0
FIFO Empty
Event
Shift
Complete
Event
1
0
Note 1:
n = PLEN<4:1> + 1.
CRC Shift Engine
CRCWDATH
CRCWDATL
Bit 0
Bit 1
Bit n(1)
X0
X1
Xn(1)
Read/Write Bus
Shift Buffer
Data



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