Microchip Technology, Inc. Microcontrollers AT89C51RB2-RLRUL

The AT89C51RB2-RLRUL is an 8-bit microcontroller compatible with the 80C52 architecture, featuring a maximum operating frequency of 40 MHz in standard mode and 20 MHz in X2 mode. It includes 16K bytes of on-chip Flash memory, which can be programmed in parallel or via in-system programming (ISP). The device supports 256 bytes of internal RAM and 1024 bytes of expanded RAM (XRAM), which is software-selectable. This microcontroller is equipped with three 16-bit timer/counters, a 9-source interrupt controller with four priority levels, and a full duplex enhanced UART with a dedicated baud rate generator. It also features a programmable counter array, a keyboard interrupt interface, and an SPI interface for master/slave communication. Power management capabilities include idle and power-down modes to reduce power consumption. The operating voltage ranges from 2.7V to 5.5V, and it is available in multiple package types including PDIL40, PLCC44, and VQFP44. The temperature range for commercial applications is 0 to +70¬8C, while industrial applications can operate from -40¬8C to +85¬8C. This microcontroller is suitable for applications requiring high-speed I/O, pulse width modulation, and counting capabilities, such as motor control and alarm systems.