M37754M8C-XXXGP is a single-chip microcomputer designed with high-performance CMOS silicon gate technology. It has a CPU and a bus interface unit. The CPU is a 16-bit parallel processor that can also be switched to perform 8-bit parallel processing, and the bus interface unit enhances the memory access efficiency to execute instructions fast. In addition to the 7700 Family basic instructions, the M37754M8C- XXXGP has 6 special instructions which contain instructions for signed multiplication/division; these added instructions improve the servo arithmetic performance to control hard disk drives and so on. This microcomputer also include the ROM, RAM, multiple-function timers, motor control function, serial I/O, A-D converter, D-A con- verter, and so on.