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AT89C51RD2_08 Datasheet, PDF (1/137 Pages) ATMEL Corporation – 8-bit Flash Microcontroller | |||
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Features
⢠80C52 Compatible
â 8051 Instruction Compatible
â Six 8-bit I/O Ports (64 Pins or 68 Pins Versions)
â Four 8-bit I/O Ports (44 Pins Version)
â Three 16-bit Timer/Counters
â 256 Bytes Scratch Pad RAM
â 9 Interrupt Sources with 4 Priority Levels
⢠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
â 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)
â 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)
⢠64K Bytes On-chip Flash Program/Data Memory
â Byte and Page (128 Bytes) Erase and Write
â 100k Write Cycles
⢠On-chip 1792 bytes Expanded RAM (XRAM)
â Software Selectable Size (0, 256, 512, 768, 1024, 1792 Bytes)
â 768 Bytes Selected at Reset for T89C51RD2 Compatibility
⢠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
â High Speed Output
â Compare/Capture
â Pulse Width Modulator
â Watchdog Timer Capabilities
⢠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)
⢠Packages: PLCC44, VQFP44, PLCC68, VQFP64
8-bit Flash
Microcontroller
AT89C51RD2
AT89C51ED2
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