外文翻译----- Freescale单片机在汽车控制中的应用

附录A

原文：

FreescaleSingle-chip Microcomputer 's

in automobile control application

Freescale has the rich micro processing unit (MCU), but widely uses in the automobile electrically controlled engine, the automobile body, the crew member safety, the vehicle door and the chair, the glass, ventilation and air conditioning, skylightand light control, automobile local area network's gateway, communication facility, global positioning system and in other automobile control unit. Its product mainly includes 8/16 bit micro controller (including HC08/HCS08, HC12/HCS12 and so on), 32 bit micro controllers (including PowerPC, ColdFire, ARM and so on)

1. 8 bit Single-chip Microcomputer MC68HC11F1 and application

1.1 Characteristicsof MC68HC11F1

8 bit micro controllerMC68HC11F1 is high performance flash memory technology low cost chip based on the CPU of 8 bit HC08 the CPU . Its dozens of kind of different specification's product may cause the user to make a choice conveniently, the superior price performance ratio may cause the cost of the automobile electronic products to be more inexpensive.

Chief feature of MC68HC11F1 : Two kind of power saving mode, stop and waiting; working normal in 3.0-5.0V voltage ; 0, 256b, 512b or 768b in on-chip RAM, Data of RAM will be retained in standby; 0, 12kb or 20kb inon-chip RAM or EPROM; Serical Communication InterfaceSCI,8 channel, 8 bit A/D transducer ; 16 bit timer systems; 8 bit pulse accumulators, real-time interrupt electric circuit and so on.

1.2 MC68HC11F1is employed inin automobile electronic control system

Since Marelli simple point electronic fuel injectionn engine management system is promoted based on MC68HC11F1,our country Shenyang gold cup sea lion passenger car , the gold cup China passenger vehicle, AnhuiChery passenger vehicle, the Tianjin Xiali passenger vehicle and so on has used this kind of engine management system . Below to take gold cup simple point Marelli logic circuit for an example, I introducesMC68HC11F1 employed inin automobile electronic control system.

1.2.1 Compositions of system

As shown in Figure 1, gold cup simple point Marelli logic circuit is mainly composed of the below part:

1.Electric circuit's control core MC68HC11F1 (CPU), is Freescale 8 bit MCU of automobile special-purpose ;

2.Tristate bus driver 74HC244 with enable, is the switch of status information input for air conditioning, oil pump, EVAP solenoid valve, idling motor and so on ;

3.8 groups rises along D trigger74HC273 with reset , isdriving signaltake-off valves for idling motor, host relay, trouble lamp, air conditioning relay power and so on;