DESCRIPTION
The Philips 8XC51/31 is a high-performance static 80C51 design fabricated with Philips high-density CMOS technology with operation from 2.7V to 5.5V.

FEATURES
•8051 Central Processing Unit
–4k ×8 ROM (80C51)
–128 ×8 RAM
–Three 16-bit counter/timers
–Boolean processor
–Full static operation
–Low voltage (2.7V to 5.5V@ 16MHz) operation
•Memory addressing capability
–64k ROM and 64k RAM
•Power control modes:
–Clock can be stopped and resumed
–Idle mode
–Power-down mode
•CMOS and TTL compatible
•TWO speed ranges at VCC= 5V
–0 to 16MHz
–0 to 33MHz
•Three package styles
•Extended temperature ranges
•Dual Data Pointers
•Security bits:
–ROM (2 bits)
–OTP/EPROM (3 bits)
•Encryption array—64 bytes
•4 level priority interrupt
•6 interrupt sources
•Four 8-bit I/O ports
•Full–duplex enhanced UART
–Framing error detection
–Automatic address recognition
•Programmable clock out
•Asynchronous port reset
•Low EMI (inhibit ALE)
•Wake-up from Power Down by an external interrupt (8XC51)