Some ISP interfaces manage to achieve the same with just a single pin, others use up to 4 for implementing a JTAG interface. In general, modern protocols try to keep the number of pins used low, typically to 2 pins. Almost all manufacturers of microcontrollers support this feature, but all have implemented their own protocols, which often differ even for different devices from the same manufacturer. There is no standard for in-system programming protocols for programming microcontroller devices. It also allows firmware updates to be delivered to the on-chip memory of microcontrollers and related processors without requiring specialist programming circuitry on the circuit board, and simplifies design work. In-system programming (ISP), or also called in-circuit serial programming (ICSP), is the ability of some programmable logic devices, microcontrollers, and other embedded devices to be programmed while installed in a complete system, rather than requiring the chip to be programmed prior to installing it into the system.
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