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.

The 8XC51/31 contains a 4k × 8 ROM, a 128 × 8 RAM, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and on-chip oscillator and clock circuits.

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)