GENERAL DESCRIPTION
The P80CL31; P80CL51 (hereafter generally referred to as the P80CLx1) is manufactured in an advanced CMOS technology.
   
FEATURES
• Full static 80C51 Central Processing Unit
• 8-bit CPU, ROM, RAM, I/O in a 40-lead DIP, 40-lead VSO or 44-lead QFP package
• 128 bytes on-chip RAM Data Memory
• 4 kbytes on-chip ROM Program Memory for P80CL51
• External memory expandable up to 128 kbytes: RAM up to 64 kbytes and ROM up to 64 kbytes
• Four 8-bit ports; 32 I/O lines
• Two 16-bit Timer/Event counters
• On-chip oscillator suitable for RC, LC, quartz crystal or ceramic resonator
• Thirteen source, thirteen vector, nested interrupt structure with two priority levels
• Full duplex serial port (UART)
• Enhanced architecture with:
    – non-page oriented instructions
    – direct addressing
    – four 8-byte RAM register banks
    – stack depth limited only by available internal RAM (maximum 128 bytes)
    – multiply, divide, subtract and compare instructions
• Reduced power consumption through Power-down and Idle modes
• Wake-up via external interrupts at Port 1
• Frequency range: 0 to 16 MHz (P80C51: 3.5 MHz min.)
• Supply voltage: 1.8 to 6.0 V (P80C51: 5.0 V ±10%)
• Very low current consumption
• Operating ambient temperature range: −40 to +85 °C.
   
APPLICATIONS
    The P80CLx1 is especially suited for real-time applications
    such as instrumentation, industrial control, intelligent
    computer peripherals and consumer products.
    The P80CLx1 also functions as an arithmetic processor
    having facilities for both binary and BCD arithmetic plus
    bit-handling capabilities.