PIC24FJ256DA206-I/PT Microchip Technology, PIC24FJ256DA206-I/PT Datasheet - Page 299

• Manufacturer Part Number: PIC24FJ256DA206-I/PT
• Description: MCU PIC 16BIT FLASH 256K 64TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ256DA206-I/PT

• Core Size: 16-Bit
• Program Memory Size: 256KB (85.5K x 24)
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, IrDA, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, GFX, LVD, POR, PWM, WDT
• Number Of I /o: 52
• Program Memory Type: FLASH
• Ram Size: 96K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Controller Family/series: PIC24
• No. Of I/o's: 52
• Ram Memory Size: 96KB
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Interface: I2C, SPI, UART, USB
• Embedded Interface Type: I2C, SPI, UART, USB
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

21.1.3
The LENDIAN bit (CRCCON1<3>) is used to control
the shift direction. By default, the CRC will shift data
through the engine, MSb first. Setting LENDIAN (= 1)
causes the CRC to shift data, LSb first. This setting
allows better integration with various communication
schemes and removes the overhead of reversing the
bit order in software. Note that this only changes the
direction the data is shifted into the engine. The result
of the CRC calculation will still be a normal CRC result,
not a reverse CRC result.
21.1.4
The module generates an interrupt that is configurable
by the user for either of two conditions.
If CRCISEL is ‘0’, an interrupt is generated when the
VWORD<4:0> bits make a transition from a value of ‘1’
to ‘0’. If CRCISEL is ‘1’, an interrupt will be generated
after the CRC operation finishes and the module sets
the CRCGO bit to ‘0’. Manually setting CRCGO to ‘0’
will not generate an interrupt. Note that when an
interrupt occurs, the CRC calculation would not yet be
complete. The module will still need (PLEN + 1)/2 clock
cycles after the interrupt is generated until the CRC
calculation is finished.
21.1.5
To use the module for a typical CRC calculation:
1.
2.
 2010 Microchip Technology Inc.
Set the CRCEN bit to enable the module.
Configure the module for desired operation:
a) Program the desired polynomial using the
CRCXORL and CRCXORH registers, and the
PLEN<4:0> bits.
b) Configure the data width and shift direction
using the DWIDTH and LENDIAN bits.
c) Select the desired interrupt mode using the
CRCISEL bit.
TYPICAL OPERATION
DATA SHIFT DIRECTION
INTERRUPT OPERATION
PIC24FJ256DA210 FAMILY
3.
4.
5.
6.
7.
8.
There are eight registers used to control programmable
CRC operation:
• CRCCON1
• CRCCON2
• CRCXORL
• CRCXORH
• CRCDATL
• CRCDATH
• CRCWDATL
• CRCWDATH
The
(Register 21-1 and Register 21-2) control the operation
of the module and configure the various settings.
The
Register 21-4) select the polynomial terms to be used
in the CRC equation. The CRCDAT and CRCWDAT
registers are each register pairs that serve as buffers
for the double-word input data, and CRC processed
output, respectively.
Preload the FIFO by writing to the CRCDATL
and CRCDATH registers until the CRCFUL bit is
set or no data is left.
Clear old results by writing 00h to CRCWDATL
and CRCWDATH. The CRCWDAT registers can
also be left unchanged to resume a previously
halted calculation.
Set the CRCGO bit to start calculation.
Write remaining data into the FIFO as space
becomes available.
When the calculation completes, CRCGO is
automatically cleared. An interrupt will be
generated if CRCISEL = 1.
Read CRCWDATL and CRCWDATH for the
result of the calculation.
CRCXOR
CRCCON1
registers
and
CRCCON2
(Register 21-3
DS39969B-page 299
registers
and