The KS57C21408/C21418/P21408 is a SAM47 core-based 4-bit CMOS single-chip microcontroller. It has a timer/counter and LCD drivers. The KS57P21408 is especially suited for use in data bank, telephone and LCD general purpose. It is built around the SAM47 core CPU and contains ROM, RAM, 39 I/O lines, programmable timer/counter, buzzer output, enough LCD dot matrix, and segment drive pins. The KS57C21408/C21418/P21408 can be used for dedicated control functions in a variety of applications, and is especially designed for multi data bank, telephone and LCD game.