PIC24FJ32GA002-I/SP Microchip Technology, PIC24FJ32GA002-I/SP Datasheet - Page 185

• Manufacturer Part Number: PIC24FJ32GA002-I/SP
• Description: IC PIC MCU FLASH 11KX24 28-DIP
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ32GA002-I/SP

• Program Memory Type: FLASH
• Program Memory Size: 32KB (11K x 24)
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 32MHz
• Connectivity: I²C, PMP, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 21
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC24FJ
• Core: PIC
• Data Bus Width: 16 bit
• Data Ram Size: 8 KB
• Interface Type: I2C/IrDA/SPI/UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240011, DM300027, DV164033, MA240013, AC164127, DM240002
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10-ch x 10-bit
• Controller Family/series: PIC24
• No. Of I/o's: 21
• Ram Memory Size: 8KB
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Embedded Interface Type: I2C, SPI, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM240011 - KIT STARTER MPLAB FOR PIC24F MCUAC162088 - HEADER MPLAB ICD2 24FJ64GA004 28AC164337 - MODULE SOCKET FOR PM3 40DIPDV164033 - KIT START EXPLORER 16 MPLAB ICD2
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

19.2
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:
To program this polynomial into the CRC generator,
the CRC register bits should be set as shown in
Table 19-1.
FIGURE 19-1:
© 2007 Microchip Technology Inc.
D
PLEN<3:0>
OUT
XOR
Overview
IN
p_clk
BIT 0
Hold
OUT
x
16
0
+ x
CRC SHIFTER DETAILS
12
+ x
5
X1
0
1
+ 1
IN
p_clk
BIT 1
Hold
OUT
1
PIC24FJ64GA004 FAMILY
Preliminary
CRC Shift Register
X2
0
1
CRC Write Bus
TABLE 19-1:
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
0th 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 0th bit or the 16th bit.
The topology of a standard CRC generator is shown in
Figure 19-2.
IN
PLEN3:PLEN0
p_clk
Hold
BIT 2
OUT
Bit Name
X<15:1>
2
CRC Read Bus
EXAMPLE CRC SETUP
X3
0
1
X15
000100000010000
0
1
Bit Value
IN
BIT 15
1111
p_clk
Hold
DS39881B-page 183
OUT
15