PIC32MX575F256LT-80I/PT Microchip Technology, PIC32MX575F256LT-80I/PT Datasheet - Page 41

• Manufacturer Part Number: PIC32MX575F256LT-80I/PT
• Description: 256KB Flash, 64KB RAM, 80 MHz, USB, 1xCAN, 8 DMA 100 TQFP 12x12x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® 32MXr

Specifications of PIC32MX575F256LT-80I/PT

• Core Processor: MIPS32® M4K™
• Core Size: 32-Bit
• Speed: 80MHz
• Connectivity: CAN, I²C, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

17.4.4
The value of Device ID register, its mask value, the
value derived from applying the mask, and the 32-bit
summation of bytes are shown in Table 17-4.
From Table 17-4, the value of “DIR” is:
TABLE 17-4:
17.4.5
The values derived in previous sections (PF, BF, DCR,
DIR) are used to calculate the checksum value. First,
perform the 32-bit summation of the PF, BF, DCR and
DIR as derived in previous sections and store it in a
variable, called temp, as shown in Example 17-1.
EXAMPLE 17-1:
© 2010 Microchip Technology Inc.
1.
2.
3.
4.
DIR = 0x00000083 (32-bit number.)
Register
First, temp = PF + BF + DCR + DIR, which translates to:
temp = 0x7F80000 + 0x002FC010 + 0x000005D4 + 0x00000083
Adding all four values results in temp being equal to 0x0827C667
Next, the 1’s complement of temp, called temp1, is calculated:
temp1 = 1’s complement (temp), which is now equal to 0xF7D83998
Finally, the 2’s complement of temp is the checksum:
Checksum = 2’s complement (temp), which is Checksum = temp1 + 1, resulting in 0xF7D83999
DEVID
CALCULATING FOR “DIR” IN THE
CHECKSUM FORMULA
COMPLETING THE PIC32
CHECKSUM CALCULATION
DIR CALCULATION EXAMPLE
CHECKSUM CALCULATION PROCESS
POR Default Value
0x00938053
0x000FF000
Mask
POR Default Value
0x00038000
& Mask
PIC32MX
32-Bit Summation of
0x00000083
DS61145G-page 41
Bytes