Found in unknown_car_mcm as a bare die but was labeled.
Not known what the geometry size of CDR1 process is.
Google indicates the MPC555 is a Freescale part but the die says Motorola. Tagging as both.
From datasheet:
PowerPC core with floating-point unit
26 Kbytes fast RAM and 6 Kbytes TPU microcode RAM
448 Kbytes Flash EEPROM with 5-V programming
5-V I/O system
Serial system: queued serial multi-channel module (QSMCM), dual CAN 2.0B controller
50-channel timer system: dual time processor units (TPU3), modular I/O system (MIOS1)
32 analog inputs: dual queued analog-to-digital converters (QADC64)
Submicron HCMOS (CDR1) technology
272-pin plastic ball grid array (PBGA) packaging
40-
MHz operation, -40 °C to 125 °C with dual supply (3.3 V, 5 V) (-55 °C to 125 °C for the suffix A device)
32-bit architecture (PowerPC ISA architecture compliant)
Core performance measured at 52.7-Kbyte Dhrystones (v2.1) @ 40
MHz
Fully static, low power operation
Integrated double-precision floating-point unit
Precise exception model