The AT89C4051 is a close relative of the AT89C2051, also made by Microchip Technology. It's a low-voltage, high-performance 8-bit microcontroller with some key improvements:
- Increased Flash Memory: The AT89C4051 boasts 4KB of Flash memory, double the capacity of the AT89C2051. This allows you to store more complex programs.
- Other Feature Enhancements: It also includes additional features like a built-in analog comparator, more I/O lines, and two 16-bit timers/counters compared to the AT89C2051's single timer.
Here's a table summarizing the key differences:
| Feature | AT89C2051 | AT89C4051 |
|---|---|---|
| Flash Memory | 2 KB | 4 KB |
| RAM | 128 bytes | 128 bytes |
| I/O Lines | 20 | 15 |
| Timers/Counters | 1 (8-bit) | 2 (16-bit) |
| Analog Comparator | No | Yes |
While the AT89C4051 offers more capabilities, it retains compatibility with the industry-standard MCS-51 instruction set, making it easy to learn and use if you're familiar with the AT89C2051.
Here are some resources for the AT89C4051:
- Microchip Technology product page: https://ww1.microchip.com/downloads/en/devicedoc/doc1001.pdf
- Datasheet: You can find the datasheet from various sources by searching online using the keywords "AT89C4051 datasheet".
Both the AT89C2051 and AT89C4051 are well-suited for learning embedded systems development. The choice between them depends on your project's needs. If you need more program storage space or additional features, the AT89C4051 might be a better choice. If you're on a tight budget or just starting out, the AT89C2051 can be a good starting point.