Microcontroller and associated method.

摘要

A VLSI microcontroller is provided which comprises: a processor for processing digital information; storage circuitry for storing digital information; an internal bus for conducting digital information to and from the processor and the storage circuitry; a plurality of first external terminals; transfer circuitry for transferring digital information between the internal bus and the plurality of external terminals, the transfer circuitry being operable in either a bus mode or a port mode; wherein the transfer circuitry in the bus mode is responsive to first digital information conducted on the internal bus; and wherein the transfer circuitry in the port mode is response to second digital information conducted on said internal bus.