Features • Popular M68HC05 Central Processor Unit (CPU) • Memory-Mapped Input/Output (I/O) Registers • 2112 Bytes of User ROM including 16 User Vector Locations • 128 Bytes of Static RAM (SRAM) • 20 Bidirectional I/O Pins and One Input-Only Pin • Synchronous Serial I/O Port (SIOP) • Fully Static Operation (No Minimum Clock Speed) • On-Chip Oscillator with Crystal/Ceramic Resonator Connections 16-Bit Capture/Compare Timer • Self-Check Mode • Four-Channel 8-bit A/D Converter • Power-Saving STOP, WAIT, and Data Retention Modes • Single 3.3-Volt to 5.0-Volt Power Requirement • 8 x 8 Unsigned Multiply Instruction 28-Pin Dual-in-Line Package (DIP) • 28-Pin Small Outline Integrated Circuit (SOIC)