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Several new additions to the MC6805 family of microcomputers include features particularly suited for automotive electronics. These devices feature application specific logic for automotive ignition systems and instrumentation designs. The MC6805S2, MC680S3, and MC68705S3 microcomputers are useful for engine ignition controls, where asynchronous events, such as engine speed and spark dwell time must be computed with high accuracy. The MC6805K2 microcomputer features EEPROM for critical data retention when the power source is disconnected. The instrumentation odometer is one such application where the EEPROM feature is mandatory. The MC68HC05C4 (ROM version) and M68HC805C4 (EEPROM version) are the latest general purpose MCU's that also offer many important features for automotive applications. The HCMOS silicon technology allows minimal power dissipation which means the devices can operate in an ambient temperature range of -55 to +125 degrees C. These two devices also feature SCI and SPI serial interface ports. The devices run at a fast 2.1-MHz internal bus speed.