SPECIFIC MCU DESIGN OF ON BOARD UNIT IN ELECTRONIC TOLL COLLECTION SYSTEM ABSTRACT A specific MCU design of On board Unit (OBU) in Electronic Toll Collection (ETC) system is proposed in this paper. According to the ETC applications, this MCU is designed to have the minimum application system. Results show that this MCU design scheme is feasible and fulfills the requirements of the central control chip used for OBU in ETC system. The MCU has about 113,000 gates, and its area is 642.74 !-lm x 494.20 !-lm under SMIC 65nm technology. The average power consumption is 98!-lW. Compared with the general MCU, the MCU has a larger advantage in ETC application. INTRODUCTION With the widespread application of ETC system, the development of OBU device becomes a hotspot of intelligent transport systems [1]. Currently on the market, OBU device is realized by using the method of board level circuit [2]. The device has bulky appearance, high cost, and is not conducive to the promo