AT80C51RD2-3CSIM [Microchip]

The AT80C51RD2 is a high-performance 8-bit microcontroller compatible with the 80C52 standard. It features 256 bytes of internal RAM, a 7-source 4-level interrupt controller, three timer/counters, a Programmable Counter Array (PCA), 1024 bytes of expanded RAM (XRAM), a hardware watchdog timer, a keyboard interface, an enhanced UART (EUART), and an X2 mode for speed improvement. It includes power control modes (Idle, Power-down) and an 8-bit clock prescaler for power reduction. The device operates from 2.7V to 5.5V and supports commercial and industrial temperature ranges.