AT89C51RE2_14 Datasheet, PDF (1/187 Pages) ATMEL Corporation – ISP (In-System Programming) Using Standard VCC Power Supply

Features
• 80C52 Compatible
– 8051 Instruction Compatible
– Four 8-bit I/O Ports (44 Pins Version)
– Three 16-bit Timer/Counters
– 256 bytes Scratch Pad RAM
– 11 Interrupt Sources With 4 Priority Levels
• ISP (In-System Programming) Using Standard V_CC Power Supply
• Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply
• Boot ROM Contains Serial Loader for In-System Programming
• High-speed Architecture
– In Standard Mode:
40 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
60 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
– In X2 Mode (6 Clocks/Machine Cycle)
20 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
30 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
• 128K bytes On-chip Flash Program/Data Memory
– 128 bytes Page Write with auto-erase
– 100k Write Cycles
• On-chip 8192 bytes Expanded RAM (XRAM)
– Software Selectable Size (0, 256, 512, 768, 1024, 1792, 2048, 4096, 8192 bytes)
• Dual Data Pointer
• Extended stack pointer to 512 bytes
• Variable Length MOVX for Slow RAM/Peripherals
• Improved X2 Mode with Independant Selection for CPU and Each Peripheral
• Keyboard Interrupt Interface on Port 1
• SPI Interface (Master/Slave Mode)
• 8-bit Clock Prescaler
• Programmable Counter Array with:
– High Speed Output
– Compare/Capture
– Pulse Width Modulator
– Watchdog Timer Capabilities
• Asynchronous Port Reset
• Two 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
• Power Supply: 2.7V to 5.5V
• Temperature Ranges: Industrial (-40 to +85°C)
• Packages: PLCC44, VQFP44
8-bit Flash
Microcontroller
AT89C51RE2