DESCRIPTION
The devices are Single-Chip 8-Bit Microcontrollers manufactured in an advanced CMOS process and are derivatives of the 80C51 microcontroller family. The instruction set is 100% compatible with the 80C51 instruction set.

FEATURES
• 80C51 Central Processing Unit
   – 8 kbytes OTP (87C51RA2)
   – 16 kbytes OTP (87C51RB2)
   – 32 kbytes OTP (87C51RC2)
   – 64 kbytes OTP (87C51RD2)
   – 512 byte RAM (87C51RA2/RB2/RC2)
   – 1 kbyte RAM (87C51RD2)
   – Boolean processor
   – Fully static operation
   – Low voltage (2.7 V to 5.5 V at 16 MHz) operation
• 12-clock operation with selectable 6-clock operation (via software
   or via parallel programmer)
• Memory addressing capability
   – Up to 64 kbytes ROM and 64 kbytes RAM
• Power control modes:
   – Clock can be stopped and resumed
   – Idle mode
   – Power-down mode
• CMOS and TTL compatible
• Two speed ranges at VCC = 5 V
   – 0 to 30 MHz with 6-clock operation
   – 0 to 33 MHz with 12-clock operation
• Parallel programming with 87C51 compatible hardware interface
   to programmer
• RAM expandable externally to 64 kbytes
• Programmable Counter Array (PCA)
   – PWM
   – Capture/compare
• PLCC, LQFP, or DIP package
• Extended temperature ranges
• Dual Data Pointers
• Security bits (3 bits)
• Encryption array - 64 bytes
• Seven interrupt sources
• 4 interrupt priority levels
• Four 8-bit I/O ports
• Full-duplex enhanced UART
   – Framing error detection
   – Automatic address recognition
• Three 16-bit timers/counters T0, T1 (standard 80C51) and
   additional T2 (capture and compare)
• Programmable clock-out pin
• Asynchronous port reset
• Low EMI (inhibit ALE, slew rate controlled outputs,
   and 6-clock mode)
• Wake-up from Power Down by an external interrupt