DESCRIPTION
The Philips 8XC550 is a high-performance microcontroller fabricated with Philips high-density CMOS technology. This Philips CMOS technology combines the high speed and density characteristics of HMOS with the low power attributes of CMOS. Philips epitaxial substrate minimizes latch-up sensitivity. The CMOS 8XC550 has the same instruction set as the 80C51.
The 8XC550 contains a 4k × 8 EPROM (87C550)/ROM (83C550)/ROMless (80C550 has no program memory on-chip), a 128 × 8 RAM, 8 channels of 8-bit A/D, four 8-bit ports (port 1 is input only), a watchdog timer, two 16-bit counter/timers, a seven-source, two-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and an on-chip oscillator and clock circuits.

FEATURES
• 80C51 based architecture
   – 4k × 8 EPROM (87C550)/ROM (83C550)
   – 128 × 8 RAM
   – Eight channels of 8-bit A/D
   – Two 16-bit counter/timers
   – Watchdog timer
   – Full duplex serial channel
   – Boolean processor
• Memory addressing capability
   – 64k ROM and 64k RAM
• Power control modes:
   – Idle mode
   – Power-down mode
• CMOS and TTL compatible
• One speed range at VCC = 5V ±10%
   – 3.5 to 16MHz
• Extended temperature ranges
• OTP package available