Summary of Features
• High Performance 16-bit CPU with 4-Stage Pipeline
    – 80 ns Instruction Cycle Time at 25 MHz CPU Clock
    – 400 ns Multiplication (16 × 16 bit), 800 ns Division (32 / 16 bit)
    – Enhanced Boolean Bit Manipulation Facilities
    – Additional Instructions to Support HLL and Operating Systems
    – Register-Based Design with Multiple Variable Register Banks
    – Single-Cycle Context Switching Support
    – 16 Mbytes Total Linear Address Space for Code and Data
    – 1024 Bytes On-Chip Special Function Register Area
• 16-Priority-Level Interrupt System with 30 Sources, Sample-Rate down to 40 ns
• 8-Channel Interrupt-Driven Single-Cycle Data Transfer Facilities via Peripheral Event Controller (PEC)
• Clock Generation via on-chip PLL (factors 1:1.5/2/2.5/3/4/5), via prescaler or via direct clock input
• On-Chip Memory Modules: 2 Kbytes On-Chip Internal RAM (IRAM)
• On-Chip Peripheral Modules
    – Two Multi-Functional General Purpose Timer Units with 5 Timers
    – Two Serial Channels (Sync./Asynchronous and High-Speed-Synchronous)
    – On-Chip Real Time Clock
• External Address Space for Code and Data
    – Programmable External Bus Characteristics for Different Address Ranges
    – Multiplexed or Demultiplexed External Address/Data Buses with 8-bit or 16-bit Data Bus Width
    – Four Programmable Chip-Select Signals
    – 4 Mbytes maximum address window size, results in a total external address space of 16 Mbytes, when all chip-select signal (address windows) are active
• Idle and Power Down Modes with Flexible Power Management
• Programmable Watchdog Timer and Oscillator Watchdog
• Up to 63 General Purpose I/O Lines, partly with Selectable Input Thresholds and Hysteresis
• Power Supply: the C161S can operate from a 5 V or a 3 V power supply (see Table 1)
• Supported by a Large Range of Development Tools like C-Compilers, Macro-Assembler Packages, Emulators, Evaluation Boards, HLL-Debuggers, Simulators, Logic Analyzer Disassemblers, Programming Boards
• On-Chip Bootstrap Loader
• 80-Pin MQFP Package