The MTU410 is a single chip 4-bit microcontroller with LCD drivers. It can drive up to 3 common times or 25 segments, i.e. a 75-segment LCD driver. This 4-bit microcontroller contains a 4-bit parallel processing ALU, 1024 x 15-bit program ROM, 64 x 4-bit data RAM, input/output ports, alarm driver, timer, clock generator, crystal and RC oscillator circuit, LCD driver and 79 powerful instructions in a single chip. The HALT instruction can be used to stop all internal operations other than timer, clock generator, crystal/RC oscillator and LCD driver. Very low current dissipation can be easily achieved by combining 4 kinds of interrupt functions and HALT instruction to minimize the operation cycle.