Features
● SAB 8051 Architecture
    – On-chip oscillator and clock circuits
    – Binary or decimal arithmetic
    – Signed-overflow detection and parity computation
    – Integrated Boolean processor for control applications
    – Full depth stack for subroutine return linkage and data storage
    – Two priority level, nested interrupt structure
    – 16-MHz oscillator frequency, 0.75 µs instruction cycle
    – 8 data pointer registers
● Serial Interface
    – Full duplex UART-interface
● On-Chip RAM
    – Direct byte and bit addressability
    – Four register banks
    – 256 bytes of data memory, including 128 user-defined software flags
    – 1024 bytes of data memory accessible with MOVX-instructions
● External Program Memory Interface
    – 512 Kbytes of program memory may be addressed by a 8-bit data bus and a 16 + 3-bit address bus
    – Extension stack depth 32 byte
● 34 Bidirectional I/O-Lines
    – Two 8-bit ports, one comprising up to eight programmable D/A-outputs
    – One 8-bit multifunction port
    – One 8-bit port with open drain output
    – One 2-bit port with optional memory extension function
● Pulse Width Modulation Unit
    – Up to eight programmable PWM-output channels for low cost digital-to-analog conversion
● Timers
    – Two 16-bit general purpose timers/event counters
    – Watchdog timer
● Analog-to-Digital Converter
    – Four multiplexed input channels to 8-bit resolution