These MCUs are fabricated using a high-performance silicon gate CMOS process, embedding the R8C/Tiny Series CPU core, and are packaged in a 20-pin molded-plastic LSSOP. It implements sophisticated instructions for a high level of instruction efficiency. With 1 Mbyte of address space, they are capable of executing instructions at high speed. Furthermore, the R8C/29 Group has on-chip data flash (1 KB x 2 blocks). The difference between the R8C/28 Group and R8C/29 Group is only the presence or absence of data flash. Their peripheral functions are the same.