PIC24FJ64GA002-I/ML Microchip Technology, PIC24FJ64GA002-I/ML Datasheet - Page 7

• Manufacturer Part Number: PIC24FJ64GA002-I/ML
• Description: IC PIC MCU FLASH 21KX24 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ64GA002-I/ML

• Program Memory Type: FLASH
• Program Memory Size: 64KB (22K x 24)
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• 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
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240011, 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 28AC164336 - MODULE SOCKET FOR PM3 28/44QFNDV164033 - KIT START EXPLORER 16 MPLAB ICD2
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 30-3:
© 2006 Microchip Technology Inc.
SDO
Note:
Section 30. Programmable Cyclic Redundancy Check (CRC)
XOR
The x
Least Significant bit of ‘0’ or ‘1’ (e.g., 1020h or 1021h) has the same effect on the CRC calculation.
D
Bit 0
clk
CRC Generator Reconfigured for x16 + x12 + x5 + 1
0
Q
bit in the CRCXOR register is omitted and is always assumed to be ‘1
30.4.2
The CRC engine needs to be properly configured in software for a given generator polynomial.
The generator polynomial is a hexadecimal number with n bits. The Most Significant bit is
represented as x
always assumed to be ‘1’. The x
coefficients of x
Consider a specific CRC polynomial as an example:
Equation 30-2:
The length of the polynomial is represented by the order of the highest power of the polynomial.
Hence, the above polynomial is of a 16-bit length. Some of its coefficients are zeros and some
are ones.
To program this polynomial into a CRC generator, the PLEN bits (CRCCON<3:0>) and
CRCXOR<15:1> bits should be programmed as shown in Table 30-1.
Table 30-1:
The polynomial length in this case is 16 (PLEN<3:0> + 1). Note that for the value of X15:X1, as
programmed in Table 30-1, the 12 and 5 bits are set to ‘1’ as required by the generator
polynomial. Bit 0 is always XORed. For a 16-bit polynomial, the 16th bit is always assumed to be
XORed; therefore, there is no CRCXOR bit for either bit 0 or bit 16.
The topology of the CRC generator configured for the example polynomial is shown in
Figure 30-3.
Register Names
D
Bit 4
clk
CRCCON
CRCXOR
Software Configuration of the CRC Engine
Q
n-1
Example CRC Setup
n
and the Least Significant bit is represented as x
to x
Advance Information
1
need to be programmed in the CRCXOR register.
D
0
Bit 5
clk
coefficient is omitted and understood to be ‘1’. Hence, only the
Q
x
PLEN3:PLEN0
16
Bit Names
+ x
X15:X1
12
+ x
5
+ 1
CRC Read Bus
D
Bit 12
clk
Q
’
. Hence, a polynomial with a
1
. The Most Significant bit is
Bit Values
DS39714A-page 30-7
1020h
CRC Write Bus
0Fh
D
Bit 15
clk
Q
30