The PD75117H is a 75X Series 4-bit single-chip microcomputer. The PD75117H is a product which has the same functions as those of the PD751xxF, with the minimum operating voltage reduced from the previous 2.7 V to 1.8 V, and achieving 1.91 s operation at 1.8 V. Therefore, it facilitates low-voltage operation for a set requiring high-speed operation. Functions are described in detail in the following User's Manual, which should be read when carrying out design work.