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Application development for embedded systems is usually done on a desktop computer (PC), using a high level language like C or assembly language. After the executable binary has been created by the cross development tools, this binary needs to be uploaded to the target board. In most cases it will go to some kind of non-volatile memory, requiring specific programming procedures.

While in earlier days a chip had been removed from the target board and placed in a programming device, today's microcontrollers and external memory chips can be re-programmed without being removed from the circuit. This is called in-ciruit or in-system programming.

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