Overview
The H8/300L Series is a series of single-chip microcomputers (MCU: microcomputer unit), built around the high-speed H8/300L CPU and equipped with peripheral system functions on-chip.

Within the H8/300L Series, the H8/3657 Series of microcomputers are equipped with a UART (Universal Asynchronous Receiver/Transmitter). Other on-chip peripheral functions include five timers, a 14-bit pulse width modulator (PWM), two serial communication interface channels, and an A/D converter. Together, these functions make the H8/3657 Series ideally suited for embedded applications in advanced control systems. The ZTATTM* versions of the H8/3657 come with userprogrammable PROM. Table 1 summarizes the features of the H8/3657 Series..