8051 Family AT80C51 Series Microcontrollers 8-bit Microcontrollers:

AT80C51RD2 microcontrollers are high performance versions of the 80C51 8-bit microcontrollers. The microcontrollers retain all features of the Atmel 80C52 with 256 bytes of internal RAM, a 7 source 4-level interrupt controller and three timer/counters.

• Clocked Up to 40 MHz
• RAM: Up to 1024B, ROM: Up to 32KB
• Dual Data Pointer
• Interface: UART
• Keyboard Interrupt Interface on Port P1
• Hardware Watchdog Timer
• 4x 8-bit I/O Ports
• 8 Interrupt Sources with 4 Priority Levels
• 3x 16-bit Timer/Counters
• Applications: LED lighting, hand hold application.