Advanced automotive microcontrollers
Probably the best example of a 'next generation' modern automotive
microcontroller is the MPC555, which was designed for powertrain
control and Intelligent Transportation Systems (ITS) applications. A
block diagram of the MPC555 is shown in Figure 10.
Figure 10 - MPC555
The MPC555 is based on the PowerPC
architecture and is composed of over 6.7 million transistors, over 300
times the complexity of a microcontroller used in a comparable
application a decade ago. The 32-Bit CPU includes multiple execution
units and a floating point unit as well as supporting a Harvard
architecture with separate load / store and instruction busses for
simultaneous instruction fetching and data handling.
The chip is well equipped with peripherals to interface with the rest of the system. There are 32 analogue inputs as well as 48 Timer Processor Unit (TPU) timer controlled input/output channels. Two CAN (Controller Area Network) serial communications interfaces are also included to provide multiplexed communications with other vehicular systems. The program memory is 448 Kbytes of Flash EEPROM with 26 Kbytes of RAM. Certain i/o structures have been added to the chip to accommodate 5v signals around the chip. Although the MPC555 has been developed for a 0.35 um manufacturing process, it is expected that the technology of other system components will develop more slowly and will still operate with a 5v power supply and signaling level.
The chip is well equipped with peripherals to interface with the rest of the system. There are 32 analogue inputs as well as 48 Timer Processor Unit (TPU) timer controlled input/output channels. Two CAN (Controller Area Network) serial communications interfaces are also included to provide multiplexed communications with other vehicular systems. The program memory is 448 Kbytes of Flash EEPROM with 26 Kbytes of RAM. Certain i/o structures have been added to the chip to accommodate 5v signals around the chip. Although the MPC555 has been developed for a 0.35 um manufacturing process, it is expected that the technology of other system components will develop more slowly and will still operate with a 5v power supply and signaling level.
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