Yes, where is Rao ?

He tells not which interfaces all these peripherals need.

E.g. on my lovely I2C bus I can connect them all without any problems and have still 30 I/O-pins unused.

Also using SPI interfaces let tons of pins unused.

And at least as memory mapped I/O up to 65536 peripherals can be connected on using the same 18 pins (P0, P2, /WR, /RD).

So how to the hell the pin count can be exceeeded ?


Peter