DESCRIPTION
The 87C528 single-chip 8-bit microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family. The 87C528 has the same instruction set as the 80C51. Three versions of the derivative exist:
• 83C528—32k bytes ROM
• 83C524—16k bytes ROM
• 80C528—ROMless version of the 83C528
• 87C528—32k bytes EPROM
• 83C524—16k bytes EPROM
This device provides architectural enhancements that make it applicable in a variety of applications in consumer, telecom and general control systems, especially in those systems which need large ROM and RAM capacity on-chip.

FEATURES
• 80C51 instruction set
    – 512 × 8 RAM
    – Memory addressing capability 64k ROM and 64k RAM
    – Three 16-bit counter/timers
    – On-chip watchdog timer with oscillator
    – Full duplex UART
    – I2C serial interface
• Power control modes:
    – Idle mode
    – Power-down mode
    – Warm start from power-down
• CMOS and TTL compatible
• Extended temperature ranges
• EPROM code protection
• OTP package available
• 16 MHz speed at VCC = 5 V