DESCRIPTION
The 87C51FA and 87C51FB Single-Chip 8-Bit Microcontrollers are manufactured in an advanced CMOS process and are derivatives of the 80C51 microcontroller family. The 87C51FA/FB has the same instruction set as the 80C51.

FEATURES
• 80C51 central processing unit
• 87C51FA: 8k × 8 EPROM
  87C51FB: 16k × 8 EPROM
   – expandable externally to 64k bytes
   – Quick Pulse programming algorithm
   – Two level program security system
• 256 × 8 RAM, expandable externally to 64k bytes
• Three 16-bit timer/counters
   – T2 is an up/down counter
• Programmable Counter Array (PCA)
   – High speed output
   – Capture/compare
   – Pulse Width Modulator
   – Watchdog Timer
• Four 8-bit I/O ports
• Full-duplex enhanced UART
   – Framing error detection
   – Automatic address recognition
• Power control modes
   – Idle mode
   – Power-down mode
• Once (On Circuit Emulation) Mode
• Five package styles
• OTP package available