Microchip AT89C51RB2-RLTUM, 8bit 80C52 Microcontroller, AT89C51, 40MHz, 16 kB Flash, 44-Pin VQFP

High-performance, 8-bit microController: 16KB flash. It retains all features of the 80C52 with 256 Bytes of internal RAM, a 9-source 4-level interrupt controller, and three timer/counters. It features a programmable counter array, an XRAM of 1024 bytes, hardware watchdog timer, keyboard interface, SPI interface, versatile serial channel that facilitates multiprocessor communication (EUART), and a speed improvement mechanism (X2 mode). Implementing an external brown-out is recommended to prevent any flash/EEPROM corruption during power-on or power-off.

80C52 Compatible
8051 Pin and Instruction Compatible
Four 8-bit I/O Ports
Three 16-bit Timer/Counters
256 Bytes Scratch Pad RAM
9 Interrupt Sources with 4 Priority Levels
Dual Data Pointer
Variable Length MOVX for Slow RAM/Peripherals