Patent ID: 6735683
Filing Date: 2004-05-11
Classification: G06F,H04W,Y02D

Abstract:
A single-chip microcomputer on a single semiconductor substrate, comprising:a central processing unit; a first bus coupled to the central processing unit, and including first data lines and first address lines; a second bus including second data lines and second address lines; an external interface circuit coupled to the second bus and selectively providing data on the second bus in parallel external from the microcomputer and receiving data in parallel from external to the microcomputer; a first controller coupled between the first bus and the second bus and including an address transceiver circuit which selectively transmits to the second bus an address signal provided from the central processing unit onto the first bus; a plurality of peripheral modules including a serial communication interface circuit which inputs data serially from external to the microcomputer and which outputs data serially external to the microcomputer; a third bus coupled to the serial communication interface circuit in the plurality of peripheral modules, and including third data lines and third address lines; and a second controller which is coupled between the second bus and the third bus and which effects a signal transfer between the second bus and the third bus.