DESCRIPTION
●The Philips 80C31/80C51/87C51 is a high-performance microcontroller fabricated with Philips high-density CMOS technology. The CMOS 8XC51 is functionally compatible with the NMOS 8031/8051 microcontrollers. The 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 8XC51 contains a 4k × 8 ROM (80C51) EPROM (87C51), a 128 × 8 RAM, 32 I/O lines, two 16-bit counter/timers, a five-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 on-chip oscillator and clock circuits.
●In addition, the device has two software selectable modes of power reduction—idle mode and power-down mode. The idle mode freezes the CPU while allowing the RAM, timers, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative.
●FEATURES
●• 8031/8051 compatible
● – 4k × 8 ROM (80C51)
● – 4k × 8 EPROM (87C51)
● – ROMless (80C31)
● – 128 × 8 RAM
● – Two 16-bit counter/timers
● – 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
●• Five speed ranges at VCC = 5V
● – 12MHz
● – 16MHz
● – 24MHz
● – 33MHz
●• Five package styles
●• Extended temperature ranges
●• OTP package available
