The AT89C51RB2-RLTUM is a high-performance 8-bit Microcontroller with 16kB flash. The flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin. It retains all features of the 80C52 with 256byte of internal RAM, a 9-source 4-level interrupt controller and three timers/counters. It features a programmable counter array, an XRAM of 1024byte, 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. The fully static design reduces system power consumption of the microcontroller by allowing it to bring the clock frequency down to any value, even DC, without loss of data.
80C52 Compatible
8051 Instruction compatible
Three 16-bit timers/counters
256byte Scratch pad RAM
9 Interrupt sources with 4 priority levels
Dual data pointer
Variable length MOVX for slow RAM/Peripherals
ISP (In-system programming) using standard VCC power supply
Boot ROM contains low level flash programming routines and a default serial loader
Keyboard interrupt interface on Port P1
SPI interface (Master/Slave mode)
8-bit Clock prescaler
Improved X2 mode with independent selection for CPU and each peripheral
5-channel Programmable counter array
Asynchronous port reset
Full-duplex enhanced UART with dedicated internal baud rate generator
Low EMI (Inhi-bit ALE)
Hardware watchdog timer (One-time enabled with reset-out)
(EN)
