The CXP1021Q is a 4-bit single chip microcomputer based on the SPC500 series. It incorporates programs in firmware for CD operations. It can be connected directly to the CDL-40 series of LSIs for CD players, and can directly drive LCDs, in addition to other features. It also supports the pitch control function and can be employed in a wide range of equipment, from deck-type CD players to radio cassettes and portable systems.