Microchip AT89C51ED2-RDTUM, 8bit 80C52 Microcontroller, AT89C51, 40MHz, 64 kB Flash, 64-Pin VQFP

High performance CMOS Flash version of the 80C51 CMOS single-chip 8-bit microController: a 64-KB flash memory block for code and for data, and 2048 bytes of EEPROM for nonvolatile data storage. The flash memory can be programmed in parallel or serial mode using the ISP capability or using software. The programming voltage is internally generated from the standard VCC pin. This device retains all of the features of the Microchip 80C52 and adds a programmable counter array, 1792 bytes of XRAM, a hardware watchdog timer, SPI interface, keyboard, a more versatile serial channel that facilitates multiprocessor communication (EUART), and a speed improvement mechanism (X2 Mode).

80C52 Compatible
8051 Instruction Compatible
Six 8-bit I/O Ports (64 Pins or 68 Pins Versions)
Four 8-bit I/O Ports (44 Pins Version)
Three 16-bit Timer/Counters
256 Bytes Scratch Pad