A controller integrated circuit, such as a cathode ray tube controller, constituting a part of a microcomputer system comprises a plurality of internal registers, a designating register to which data designating at least one of the internal registers is set, a selection circuit selecting one of the internal...http://www.google.com.hk/patents/US4845657?utm_source=gb-gplus-share專利 US4845657 - Controller integrated circuit
