ISP, which is also known as In-system programming and In-Circuit Serial Programming or ICSP, has the capability of programming some logical devices like micro controllers and other embedded devices while they are installed in a system. There is no need to program the chip separately before embedding it into the system.
There are numerous in-system programming protocols which are incompatible when it comes to program the devices used in the microcontrollers. Some of these devices are AVRs, PIC microcontrollers, Parallax Propellers and others. The ICSP has been introduced with the aim of programming the dsPIC and PIC devices.
Read More at Blogspot.com
kandauk 