DESCRIPTION
The Philips 8XC451 is an I/O expanded single-chip microcontroller fabricated with Philips high-density CMOS technology. Philips epitaxial substrate minimizes latch-up sensitivity.
   
FEATURES
• 80C51 based architecture
• Seven 8-bit I/O ports
• Port 6 features:
    – Eight data pins
    – Four control pins
    – Direct MPU bus interface
    – Parallel printer interface
• On the microcontroller:
    – 4k × 8 ROM (83C451)
        4k × 8 EPROM (87C451)
        ROMless version (80C451)
    – 128 × 8 RAM
    – Two 16-bit counter/timers
    – Two external interrupts
• External memory addressing capability
    – 64k ROM and 64k RAM
• Low power consumption:
    – Normal operation: less than 24mA at 5V, 12MHz
    – Idle mode
    – Power-down mode