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  • AT89C51RD2-IM

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  • Package/Case :
  • PLCC44
  • Product Categories :
  • 8051 MCU Products
  • RoHs Status:
  • Lead free/RoHS Compliant
  • In-stock:
  • 658


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AT89C51RD2-IM Product Details

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 Microchip 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).



• 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 RAM
– 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
– 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)
• 64K Bytes On-chip Flash Program/Data Memory
– Byte and Page (128 Bytes) Erase and Write
– 100k Write Cycles
• On-chip 1792 bytes Expanded RAM (XRAM)
– Software Selectable Size (0, 256, 512, 768, 1024, 1792 Bytes)
– 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 CPUand Each Peripheral
• Keyboard Interrupt Interface on Port 1
• SPI Interface (Master/Slave Mode)
• 8-bit Clock Prescaler
• 16-bit Programmable Counter Array
– High Speed Output
– Compare/Capture
– Pulse Width Modulator
– 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

Technical Parameters

  • Program Memory Type
  • Flash
  • Program Memory Size (KB)
  • 64
  • CPU Speed (MIPS/DMIPS)
  • 10
  • SRAM (B)
  • 2
  • Digital Communication Peripherals
  • 1-UART, 1-SPI,
  • Temperature Range (°C)
  • 0 to 0
  • Operating Voltage Range (V)
  • 2.7 to 5.5
  • Pin Count
  • 44

AT89C51RD2-IM Documents

  • AT89C51RD2 Technical Documentation of Application Note
  • AT89C51RD2 Technical Documentation of Application Note

AT89C51RD2-IM Related Products

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Estimated Delivery Time: Jul 05 - Jul 10 days (choose Expedited at checkout).

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    Minimum order quantity starts from 1pcs.

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  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that AT89C51RD2-IM is the original manufacturer or agent of MICROCHIP?
We have a professional business development department to strictly test and verify the qualifications of MICROCHIP original manufacturers and agents. All MICROCHIP suppliers must pass the qualification review before they can publish their AT89C51RD2-IM devices; we pay more attention to the channels and quality of AT89C51RD2-IM products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of AT89C51RD2-IM chips? Including MICROCHIP original factory information, 8051 MCU Products application, AT89C51RD2-IM pictures?
You can use Jotrin's intelligent search engine, or filter by 8051 MCU Products category, or find it through Microchip Technology, Inc Information page.
Q: Are the MICROCHIP's AT89C51RD2-IM price and stock displayed on the platform accurate?
The MICROCHIP's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for AT89C51RD2-IM, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of AT89C51RD2-IM?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the AT89C51RD2IM we delivered, we will accept the replacement or return of the AT89C51RD2-IM only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of AT89C51RD2-IM.
(3)The AT89C51RD2-IM is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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Microchip Technology, Inc

Microchip Technology Inc. is a leading manufacturer of microcontroller and analog products, providing low-risk product development, lower total system cost, and faster time to market for thousands of diverse customer applications worldwide. Microchip offers outstanding technical support along with d...
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