Where is the information what is the minimum-required circuitry to program any AVR via ICSP?
Sometimes I see schematics that show just the chip and the six wires for the ICSP header (RESET, VCC, GND, MISO, MOSI, and SCK).
Other times, I see some passive components connected to some of the pins.
So why is it different some times? How do people know when to use extra components when wiring up the chip for programming? Do the datasheet for these MPU's provide the details?