FUNCTIONAL DESCRIPTION
ST10R272L architecture combines the advantages of both RISC and CISC processors with an advanced peripheral subsystem. The following block diagram overviews the different on-chip components and the internal bus structure.

■ High Performance 16-bit CPU
    ● CPU Frequency: 0 to 50 MHz
    ● 40ns instruction cycle time at 50-MHz CPU clock
    ● Multiply-Accumulate unit (MAC)
    ● 4-stage pipeline
    ● Register-based design with multiple variable register banks
    ● Enhanced boolean bit manipulation facilities
    ● Additional instructions to support HLL and operating systems
    ● Single-cycle context switching support
    ● 1024 bytes on-Chip special function register area
■ Memory Organisation
    ● 1KByte on-chip RAM
    ● Up to 16 MBytes linear address space for code and data (1 MByte with SSP used)
■ External Memory Interface
    ● Programmable external bus characteristics for different address ranges
    ● 8-bit or 16-bit external data bus
    ● Multiplexed or demultiplexed external address/data buses
    ● Five programmable chip-select signals
    ● Hold and hold-acknowledge bus arbitration support
■ One Channel PWM Unit
    ● Fail Safe Protection
    ● Programmable watchdog timer
    ● Oscillator Watchdog
■ Interrupt
    ● 8-channel interrupt-driven single-cycle data
    transfer facilities via peripheral event
    controller (PEC)
    ● 16-priority-level interrupt system with 17 sources, sample-rate down to 40 ns
■ Timers
    ● Two multi-functional general purpose timer units with 5 timers
    ● Clock Generation via on-chip PLL, or via direct or prescaled clock input
■ Serial Channels
    ● Synchronous/asynchronous
    ● High-speed-synchronous serial port SSP
■ Up to 77 general purpose I/O lines
■ No bootstrap loader
■ Electrical Characteristics
    ● 5V Tolerant I/Os
    ● 5V Fail-Safe Inputs (Port 5)
    ● Power: 3.3 Volt +/-0.3V
    ● Idle and power down modes
■ Support
    ● C-compilers, macro-assembler packages, emulators, evaluation boards, HLLdebuggers, simulators, logic analyser disassemblers, programming boards
■ Package
    ● 100-Pin Thin Quad Flat Pack (TQFP)