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48GA004 Datasheet(PDF) 187 Page - Microchip Technology

Part # 48GA004
Description  28/44-Pin General Purpose, 16-Bit Flash Microcontrollers
PDF  268 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

48GA004 Datasheet(HTML) 187 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS39881D-page 187
PIC24FJ64GA004 FAMILY
20.0
PROGRAMMABLE CYCLIC
REDUNDANCY CHECK (CRC)
GENERATOR
The programmable CRC generator offers the following
features:
• User-programmable polynomial CRC equation
• Interrupt output
• Data FIFO
The module implements a software configurable CRC
generator. The terms of the polynomial and its length
can be programmed using the CRCXOR (X<15:1>) bits
and the CRCCON (PLEN3:PLEN0) bits, respectively.
Consider the CRC equation:
x16 + x12 + x5 + 1
To program this polynomial into the CRC generator,
the CRC register bits should be set as shown in
Table 20-1.
TABLE 20-1:
EXAMPLE CRC SETUP
Note that for the value of X<15:1>, the 12th bit and the
5th bit are set to ‘1’, as required by the equation. The 0
bit required by the equation is always XORed. For a
16-bit polynomial, the 16th bit is also always assumed
to be XORed; therefore, the X<15:1> bits do not have
the 0 bit or the 16th bit.
The topology of a standard CRC generator is shown in
Figure 20-2.
FIGURE 20-1:
CRC SHIFTER DETAILS
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
30.
Programmable
Cyclic
Redundancy Check (CRC)”
(DS39714).
Bit Name
Bit Value
PLEN3:PLEN0
1111
X<15:1>
000100000010000
IN
OUT
BIT 0
0
1
p_clk
X1
IN
OUT
BIT 1
0
1
p_clk
X2
IN
OUT
BIT 2
0
1
p_clk
X3
IN
OUT
BIT 15
0
1
p_clk
X15
XOR
DOUT
01
2
15
PLEN<3:0>
Hold
Hold
Hold
Hold
CRC Read Bus
CRC Write Bus
CRC Shift Register



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