The NM25C041 is a 4096-bit MODE 1 SPI (Serial Peripheral Interface) CMOS EEPROM which is designed for high-reliability non-volatile data storage applications. The SPI interface features a byte-wide format (all data is transferred in 8-bit words) to interface with the Motorola 68HC11 microprocessor, or equivalent, at a 2.1MHz clock transfer rate. (This interface is considered the fastest serial communication method.) This 4-wire SPI interface allows the end user full EEPROM functionality while keeping pin count and space requirements low for maximum PC board space utilization.