High performance CMOS flash version of the 80C51 CMOS single-chip 8-bit microcontroller with a 64-KB flash memory block for code and for data. The flash memory can be programmed in parallel or serial mode using ISP or software. The programming voltage is internally generated from the standard VCC pin.
This device retains all of the features of the Atmel 80C52 and adds a programmable counter array, 1792 bytes of XRAM, hardware watchdog timer, SPI interface, keyboard, versatile serial channel that facilitates multiprocessor communication (EUART), and a speed improvement mechanism (X2 Mode).
Feature
80C52 Compatible - 8051 instruction compatible
Integrated power monitor (POR/PFD) to supervise internal power supply
ISP (In-System Programming) using standard VCC power supply
2048-byte Boot ROM contains low level flash programming routines and a default serial loader
High-speed architecture
64kB On-chip flash program/data memory
On-chip 1792-byte expanded RAM (XRAM)
On-chip 2048-byte EEPROM block for data storage (AT89C51ED2 Only)
100K Writing cycles
Dual data pointer
Variable length MOVX for slow RAM/peripherals
Improved X2 mode with independent selection for CPU and each peripheral
Keyboard interrupt interface on port P1
SPI interface (master/slave mode)
8-bit Clock prescaler
16-bit Programmable counter array
Asynchronous port reset
Full-duplex enhanced UART with dedicated internal baud rate generator
Low EMI (inhibit ALE)
Hardware watchdog timer (one-time enabled with reset-out), power-off flag
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
