The LC82151 is a facsimile controller that integrates the main functions required by facsimile systems on a single chip. The LC82151 includes a FAX modem with ADPCM and HDLC functions, image processing functions that can create high-quality binary image data without external memory, a CODEC accelerator, a CPU and CPU peripheral circuits, general-purpose I/O ports, and other functions. A facsimile system with excellent costperformance characteristics can be created easily by providing ROM and RAM.