PIC24FJ48GA002-I/SS Microchip Technology, PIC24FJ48GA002-I/SS Datasheet - Page 187

• Manufacturer Part Number: PIC24FJ48GA002-I/SS
• Description: IC PIC MCU FLASH 48K 28-SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ48GA002-I/SS

• Core Size: 16-Bit
• Program Memory Size: 48KB (16K x 24)
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, PMP, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 21
• Program Memory Type: FLASH
• 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
• Package / Case: 28-SSOP
• Controller Family/series: PIC24
• No. Of I/o's: 21
• Ram Memory Size: 8KB
• Cpu Speed: 32MHz
• No. Of Timers: 5
• No. Of Pwm Channels: 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 28AC164338 - MOD SKT PIC24F/DSPIC33F 28SOICDV164033 - KIT START EXPLORER 16 MPLAB ICD2
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

20.0
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.
FIGURE 20-1:
 2010 Microchip Technology Inc.
Note:
D
PLEN<3:0>
OUT
XOR
PROGRAMMABLE CYCLIC
REDUNDANCY CHECK (CRC)
GENERATOR
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
”Section 30. Programmable Cyclic
Redundancy Check (CRC)” (DS39714).
IN
p_clk
Hold
BIT 0
OUT
0
Family
CRC SHIFTER DETAILS
X1
Reference
0
1
IN
p_clk
Hold
BIT 1
OUT
Manual”,
1
PIC24FJ64GA004 FAMILY
CRC Shift Register
X2
0
1
CRC Write Bus
Consider the CRC equation:
To program this polynomial into the CRC generator,
the CRC register bits should be set as shown in
Table 20-1.
TABLE 20-1:
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 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.
IN
PLEN3:PLEN0
p_clk
Hold
BIT 2
OUT
Bit Name
X<15:1>
2
CRC Read Bus
EXAMPLE CRC SETUP
X3
x
0
1
16
+ x
X15
12
000100000010000
0
1
+ x
5
Bit Value
+ 1
IN
BIT 15
p_clk
1111
Hold
DS39881D-page 187
OUT
15