INTRODUCTION TO ISP( In System
Programming)
In a simple way,
ISP can be defined as a programming concept where the controller is programmed
without removing it from the board and without using any external programming
device.
ISP needs an
UART for programming the controller.
In older systems
and 8 bit controllers the user had to carefully remove the controller from the
target device and mount it on a separate device called “programmer”, use custom
software for the programmer to copy the hex file to the flash of the
controller.
In this kind of
programming all the external peripheral devices will be non functional at the
time of programming the controller.
After the
programming is done the controller is reset so that it communicates with the
external devices.
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