... on the PIC MCU you are working with and the size and com-plexity of the function you wish to implement, the overhead of saving the data, calling the function, returning from the function, and ... used to synchronize the transfer of the application file to the PIC microcontroller (waiting for the PIC to pro-gram the data into its program memory). The need for synchronizing the write of program ... youcannot use the UART port, then there are a number of other interfaces that can be used,including1 I2C, with the PIC microcontroller as a slave device2 SPI, again with the PIC microcontroller...