The HT66F0185 manufactured by Holtek is an eight-bit microcontroller with a SSOP-28 package. It is 150 mil wide RoHS (Restriction of Hazardous Substances Directive) compliant and is constructed from low-voltage CMOS technology. The on-chip ROM contains a 4K byteProgram Memory and 64 bytes RAM. This microcontroller contains an 8-bit RISC CPU core with seven 8-bit working registers. Additionally, the device features aeight-stage pipeline, a feedback shift register and random pulse generator, andseveral hardware peripherals including two 8-bit pared Timer/Counters,an A/D Converter, two I/O Ports, a serial interface and a watchdog timer. All of these features make the HT66F0185 an excellent choice for a wide range of applications.