Hi, Need some info on how mpc 555 is used as a power train control module and in engine management system. Freescale doesn't have any information pertaining to it directly. Any links or information would be appreciated.
Jan
The MPC555 has two Time Processor Units (TPUs). These provide high-speed microcoded timing functions, several of which are designed specifically for engine timing, while requiring minimal service from the core microprocessor. The TPUs can also run user-defined functions from the TPU RAM.
You might want to read up on the PMA and PMM functions from my web site here:
These are specifically designed for timing gear functions (detecting the missing tooth, for example).
--Gene
Thanks for the info Gene. Jan
The MPC555 is used in Engine Control Modules (ECMs) and Powertrain Control Modules (PCMs). The ECM controls only engine related functions, while the PCM controls engine and transmission related functions. Normally, the on-chip RAM is sufficient for automotive use and there will be no external RAM. There will normally be at least 1 MB of external flash used to hold program code, constants, and look-up table data. Some dynamic data is contained in the flash which will be updated just before the ECM/PCM powers off--usually 6-8 seconds after the ignition is turned off.
There are two TPUs in the MPC555, each capable of running built-in functions or from TPU RAM which can contain custom functions. The TPUs can process engine timing information and control spark and fuel delivery. The queued serial module provides SPI capability. Most peripheral chips required in ECMs/PCMs receive commands (if commandable) and transmit status via SPI. It's cheap. The TouCAN module provides CAN communications for the ECM/PCM to the vehicle LAN.
~Dave~
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