Access for microprocessor to external component

摘要

The microprocessor access to an external circuit (4) controlled by a separate clock (5) to the microprocessor clock (6) is provided by an interface circuit (10) and a timing controller (11). The interface unit transfers an address and exchanges data between the microprocessor and the external device (3). The timing controller receives inputs from the microprocessor and device clocks, and controls the operation of the interface circuit so that the transfer is compatible with both the microprocessor and the external device.