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