The MC68HC812A4 microcontroller unit (MCU) isa 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus.
Modules include : • 16-bit central processor unit (CPU12) • Lite integration module (LIM) • Two asynchronous serial communications interfaces (SCI0 and SCI1) • Serial peripheral interface (SPI) • Timer and pulse accumulator module • 8-bit analog-to-digital converter (ATD) • 1-Kbyte random-access memory (RAM) • 4-Kbyte electrically erasable, programmable read-only memory (EEPROM) • Memory expansion logic with chip selects, key wakeup ports, and a phase-locked loop (PLL)