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# 1.4.2.2 CAN Bootloader Firmware Update mode execution flow

Bootloader Task Flow

- Bootloader task is the main task which calls the Input sub-tasks in a forever loop.

- It calls the Input task to poll for command packets from host

- Once complete packet is received Input Task calls Command task to process the received command

- If the command received was a data command Command task calls Flash Task to flash the application

Input Task Flow

- This task is used to receive the data bytes from embedded host

- The task keeps polling for data to be received when bootloader is in idle mode

- Once the packet reception is completed it gives control to Command Task

Command Task Flow

- The task first validates the incoming packet from host with expected header information

- The task processes the commands received from Input Task and provides response back to host accordingly

- If the command received is a Data command it gives control to the Flash Task

Flash Task Flow

- This task is responsible to program the internal flash memory with data packet received

For CORTEX-M based MCUs

- The task uses the NVM peripheral library to perform the Unlock/Erase/Write Operations

For MIPS based MCUs