GENERAL DESCRIPTION
The single-chip 8-bit microcontroller is manufactured in MXICs advanced CMOS process. This device uses the same powerful instruction set, has the same architecture, and is pin-to-pin compatible with the existing 80C51.
   
FEATURE
• High performance CMOS ROM CPU
• Operation Voltage 5V
• Up to 40MHz operation (3.5MHz to 40MHz)
• Three 16-bit timer/counters
• 256 Bytes of on-chip data RAM
• 4/8/16/32/64 Kbytes on-chip Program memory
• 32 Programmable I/O lines
• On-chip Watch-Dog-Timer (WDT)
• 6 interrupt Sources
• ROM Code protection
• Two priority levels
• Power saving Idle and power down modes
• 64 K external program memory space
• 64 K external data memory space
• Available in PLCC, PQFP, and PDIP package
• Four 8-bit I/O ports
• Full-duplex enhanced UART compatible with the
    standard 80C51 and the 80C52
• Extended Temperature Range (-40°C to +85°C)