AT89C51 8-Bit Microcontroller PDIP-40
Low-power 8-bit microcontroller AT89C51 in PDIP-40 package; 4 KB Flash, 128 bytes RAM, 32 I/O lines, compatible with MCS-51 instruction set — ideal for embedded control.
85.00 EGP
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The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
It works with the popular 8051 architecture and hence is used by most beginners till date. It has four ports and all together provide 32 Programmable GPIO pins. It does not have in-built ADC module and supports only USART communication. Although it can be interfaced with external ADC IC like the ADC084 or the ADC0808.
The AT89C51 is no longer in production and Atmel does not support new design. Instead, the new AT89S51 is recommended for new applications. But since the AT89C51 has a strong community support, if your motive is to learn embedded then AT89C51 can still be a good choice.
Features
- Compatible with MCS-51 ™ Products
- 4K Bytes of In-System Reprogrammable Flash Memory
- Endurance: 1,000 Write/Erase Cycles
- Fully Static Operation: 0 Hz to 24 MHz
- Three-level Program Memory Lock
- 128 x 8-bit Internal RAM
- 32 Programmable I/O Lines
- Two 16-bit Timer/Counters
- Six Interrupt Sources
- Programmable Serial Channel
- Low-power Idle and Power-down Modes
PINOUT
| Pin Number | Pin Name | Description |
| 1 | P1.0 | 0th pin of PORT P1 |
| 2 | P1.1 | 1st pin of PORT P1 |
| 3 | P1.2 | 2nd pin of PORT P1 |
| 4 | P1.3 | 3rd pin of PORT P1 |
| 5 | P1.4 | 4th pin of PORT P1 |
| 6 | P1.5 | 5th pin of PORT P1 |
| 7 | P1.6 | 6th pin of PORT P1 |
| 8 | P1.7 | 7th pin of PORT P1 |
| 9 | RST | Reset pin of the Microcontroller |
| 10 | (RXD) P3.0 | 0th pin of PORT P3 or Receiver pin of Microcontroller |
| 11 | (TXD) P3.1 | 1st pin of PORT P3 or Transmitter pin of Microcontroller |
| 12 | (INT0) P3.2 | 2nd pin of PORT P3 or External Interrupt 0 of MCU |
| 13 | (INT1) P3.3 | 3rd pin of PORT P3 or External Interrupt 1 of MCU |
| 14 | (T0) P3.4 | 4th pin of PORT P3 or Timer 0 interrupt of MCU |
| 15 | (T1) P3.5 | 5th pin of PORT P3 or Timer 1 interrupt of MCU |
| 16 | (WR) P3.6 | 6th pin of PORT P3 or Write to External data memory pin |
| 17 | (RD) P3.7 | 7th pin of PORT P3 or Read from External data memory pin |
| 18 | XTAL2 | External crystal pin 2 of Microcontroller |
| 19 | XTAL1 | External crystal pin 1 of Microcontroller |
| 20 | GND | Ground pin of MCU |
| 21 | P2.0(A8) | 0th pin of PORT P2 or High-order Address bit 8 of MCU |
| 22 | P2.1(A9) | 1st pin of PORT P2 or High-order Address bit 9 of MCU |
| 23 | P2.2(A10) | 2nd pin of PORT P2 or High-order Address bit 10 of MCU |
| 24 | P2.3(A11) | 3rd pin of PORT P2 or High-order Address bit 11 of MCU |
| 25 | P2.4(A12) | 4th pin of PORT P2 or High-order Address bit 12 of MCU |
| 26 | P2.5(A13) | 5th pin of PORT P2 or High-order Address bit 13 of MCU |
| 27 | P2.6(A14) | 6th pin of PORT P2 or High-order Address bit 14 of MCU |
| 28 | P2.7(A15) | 7th pin of PORT P2 or High-order Address bit 15 of MCU |
| 29 | PSEN | Program store enable pin, Read external program memory |
| 30 | ALE/PROG | Address Latch Enable/ Program Pulse input for flashing |
| 31 | EA/VPP | Access Enable voltage/Program enable voltage |
| 32 | P0.7(AD7) | 7th pin of PORT P0 or Low-order Address bit 7 of MCU |
| 33 | P0.6(AD6) | 6th pin of PORT P0 or Low -order Address bit 6 of MCU |
| 34 | P0.5(AD5) | 6th pin of PORT P0 or Low -order Address bit 5 of MCU |
| 35 | P0.4(AD4) | 6th pin of PORT P0 or Low -order Address bit 4 of MCU |
| 36 | P0.3(AD3) | 3rd pin of PORT P0 or Low -order Address bit 3 of MCU |
| 37 | P0.2(AD2) | 2nd pin of PORT P0 or Low -order Address bit 2 of MCU |
| 38 | P0.1(AD1) | 1st pin of PORT P0 or Low -order Address bit 1 of MCU |
| 39 | P0.0(AD0) | 0th pin of PORT P0 or Low -order Address bit 0 of MCU |
| 40 | Vcc | Supply pin of MCU |
Specifications
| AT89C51 | |
| CPU | 8-bit 8051 family |
| Architecture | 8051 |
| Program Memory Size (Kbytes) | 4K Flash |
| RAM (bytes) | 128 |
| EEPROM/HEF | Nil |
| Pin Count | 40 |
| Max. CPU Speed (MHz) | 24 |
| Peripheral Pin select (PPS) | No |
| Internal Oscillator | No |
| No. Of comparators | 2 |
| No. Of Operational Amplifier | 0 |
| No. Of ADC channels | Nil |
| Max ADC Resolution (bits) | NA |
| ADC with Computation | No |
| Number of DAC Converter | 0 |
| Max DAC resolution | 0 |
| Internal Voltage Reference | NA |
| Zero Cross Detect | No |
| No. Of 8-bit timers | 0 |
| No. Of 16-bit Timers | 2 |
| Signal Measurement Timer | 0 |
| Hardware Limit Timer | 0 |
| No. Of PWM outputs | 0 |
| Max PWM resolution | NA |
| Angular Timer | No |
| Math Accelerator | No |
| No. Of UART module | 1 |
| No. Of SPI Module | 0 |
| No. Of I2C module | 0 |
| No. Of USB Module | 0 |
| Windowed Watchdog Timer (WWDT) | No |
| CRC/Scan | No |
| Numerically Controlled Oscillator | 0 |
| Cap. Touch Channels | NA |
| Segment LCD | 0 |
| Minimum Operating Temperature (*C) | -55 |
| Maximum Operating Temperature (*C) | 125 |
| Minimum Operating Voltage (V) | 4 |
| Maximum Operating Voltage (V) | 5.5 |
| High Voltage Capable | No |
Note: The AT89C51 datasheet of the Microcontroller and more detailed Features can be found at the bottom of this page.
Applications
- Multiple DIY Projects
- Very good choice if you are learning ATmel
- Projects requiring Multiple I/O interfaces and communications
- Replacement for Arduino Module
- Ideal for more advanced level A/D applications in automotive, industrial, appliances and consumer applications.
Package Contents
- 1x AT89C51 8-Bit Microcontroller PDIP-40.
Documents
| Datasheet | AT89C51 |
| CAD Files | Download |
| Weight | 5 g |
|---|---|
| Dimensions | 50 × 20 × 10 mm |
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