The PD75336 is one of the "75X-series" 4-bit single-chip microcomputers enabled to process data with performance equivalent to that of 8-bit microcomputers. The PD75336 is a microcomputer with an expanded capacity of the ROM and RAM of conventional PD75328 and an improved 8-bit data processing capacity. It can carry out A/D converter low-voltage operations. For evaluation purposes for system development or small-quantity production, the PD75P336 is available which is a product with the on-chip mask ROM of PD75336 replaced with a one-time PROM. Functions are described in detail in the following User's Manual, which should be read when carrying out design work.