80C52 Compatible
Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply
ISP (In-System Programming) Using Standard VCC Power Supply
2048 Bytes Boot ROM Contains Low Level Flash Programming Routines and a Default Serial Loader
High-speed Architecture
64K Bytes On-chip Flash Program/Data Memory
On-chip 1792 bytes Expanded RAM (XRAM)
On-chip 2048 Bytes EEPROM Block for Data Storage (AT89C51ED2 Only)
100K Write 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 1
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
Power Control Modes: Idle Mode, Power-down Mode
Single Range Power Supply: 2.7V to 5.5V
Industrial Temperature Range (-40 to +85°C)