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What is the microchip algorithm for checksum calculation?

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Anvaya
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2020/01/08 07:40:00 (permalink)
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What is the microchip algorithm for checksum calculation?

I am developing a bootloader using dsPic33EP256GM706. For that, i am using MPLAB x IDE v5.15 and XC16 V1.36 compiler. I want to add the CRC check to generated application hex file. I am including checksum in my hex file using “Insert unprotected checksum in user ID memory” option from build configuration as shown in attached image. 
I would like to know how this MPLAB checksum is calculated? Because I want to do the same thing in my checksum calculation algorithm.
 

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