AT89C51RD2-UM
AT89C51RD2-UM ATMELAT89C51RD2-UM
AT89C51RD2-UM ATMEL
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Manufacturer Part # : AT89C51RD2-UM
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Package/Case: PLCC-44
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Brand: Microchip Technology
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Product Categories : Microcontrollers
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AT89C51RD2-UM DataSheet
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Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
AT89C51RD2/ED2 is high performance CMOS Flash version of the 80C51 CMOS single chip 8-bit microcontroller. It contains a 64-Kbyte Flash memory block for code and for data.The 64-Kbytes Flash memory can be programmed eitherin parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin.The AT89C51RD2/ED2 retains all of the features of the Atmel 80C52 with 256 bytes of internal RAM, a 9-source 4-level interrupt controller and three timer/counters. The AT89C51ED2 provides 2048 bytes of EEPROM for nonvolatile data storage.Features• 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
![](/files/uploads/product/b/7da5bdcb3489490db13f31449af72ae0.webp)
Key Features
- 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
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Manufacturer | Intel / Altera | Product Category ! | IC Chips |
Specification Comparison
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is AT89C51RD2-UM?
The AT89C51RD2-UM is an 8-bit microcontroller with 64KB flash memory, designed by Microchip Technology. It is part of the 8051 family of microcontrollers and is ideal for various embedded applications such as automotive, industrial control, and consumer electronics.
How Does AT89C51RD2-UM Work?
The AT89C51RD2-UM operates as a microcontroller with 8-bit processing capability and 64KB of flash memory for program storage. It integrates peripherals such as timers, serial communication interfaces, and analog-to-digital converters, enabling it to perform a wide range of tasks in embedded systems.
How Many Pins does AT89C51RD2-UM have and What are the Functions of the Pinout Configuration?
The AT89C51RD2-UM is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package. The pinout configuration includes:
- VCC, GND: Power supply and ground pins, respectively.
- Port 0 - Port 3: General-purpose I/O port pins.
- RXD, TXD: Serial communication interface pins.
- T0, T1: Timer/counter pins.
- AIN0 - AIN7: Analog input pins for analog-to-digital conversion.
- EA, ALE/PROG, PSEN: Special function pins for addressing and programming.
- XTAL1, XTAL2: Crystal oscillator input and output pins.
What are the Pros and Cons of AT89C51RD2-UM?
Pros:
- High Flash Memory: Offers a generous 64KB flash memory for program storage.
- Peripherals Integration: Integrates various peripherals for versatile embedded system design.
- Wide Application Range: Suitable for diverse applications in automotive, industrial, and consumer electronics.
- Industry Standard: Part of the well-established 8051 microcontroller family with extensive support and resources.
Cons:
- 8-Bit Architecture: Limited computational capability compared to 16 or 32-bit microcontrollers for certain applications.
- Package Size: The 44-pin PLCC package may be larger compared to more modern, compact packages.
Are There Any Equivalents/Alternatives to AT89C51RD2-UM for Recommendation?
- The ATmega32 from Microchip Technology is an alternative 8-bit microcontroller with similar features and capabilities.
- Equivalents to the AT89C51RD2-UM include the PIC18F4550 from Microchip Technology and the MSP430G2553 from Texas Instruments.
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