Atmega64 引脚问题。 SCL/SDA 与 TXD/RDX 相同吗？
无论如何，我都不是 Atmega 专业人士。事实上，从未与他们合作过。我正在尝试使用 i2c 接口将外部 eeprom 添加到使用 Atmega64 控制器的设备。从数据表中，我看到引脚 25 和 26 标记为 PD0/PD1，并且是 i2c 的 SCL/SDA。这很好，花花公子。然后我走到黑板上开始追踪。我看到这些开关连接到带有一些简单电路的摇杆开关，我还没有仔细研究过，但我认为它是 i2c 兼容的。但后来我意识到这个设备有两个这样的摇杆，所以我希望将另一个摇杆追溯到相同的两个引脚（因为 i2c 是可以有多个从设备的总线）。相反，他们追溯到两个相邻的引脚 27 和 28，标记为 PD2/PD3 和 RXD1/TXD1。好吧，现在这让我很困惑。
我希望我可以在 SCL/SDA 线上并行添加内存，但是我现在发现我发现的意思是：
- SCL/SDA 可以与 RXD1/RXD2 互换，或者
- 我对 SCL/SDA 的工作原理感到困惑它不是总线还是可以用作简单的输入？
可悲的是，我不太确定我在问什么。有人可以解释一下吗？我是否仍然可以将内存添加到 SCL/SDA，或者可能不能？
谢谢。
史蒂夫
I'm not an Atmega pro by any means whatsoever. In fact, never worked with them. I'm trying to add an external eeprom using i2c interface to a device that uses an Atmega64 controller. From the datasheet, I see that pins 25 and 26 are labeled PD0/PD1 and are the SCL/SDA for i2c. That's fine and dandy. So then I go to the board and start tracing. I see that those go to a rocker switch with some simple circuitry that I haven't had a good look at yet, but I assumed it was something i2c compatible. But then what dawned on me was that this device has two such rockers so I expected to trace the other rocker back to the same two pins (since i2c is a bus that can have multiple slaves). Instead, they traced back to the two adjacent pins 27 and 28 labeled PD2/PD3 and RXD1/TXD1. Well, now that confused me.
I expected that I could add the memory in parallel on the SCL/SDA lines, but does what I now figure that what I discovered either means:
- SCL/SDA is interchangeable with RXD1/RXD2 or
- I'm confused on how SCL/SDA works and its not a bus or it can be used as a simple input?
Sadly, I'm not really sure what I'm asking. Can someone shed some light on this? Should I still be able to add the memory to SCL/SDA or probably not?
Thanks.
Steve
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没关系，我找到了答案。它既是总线又是简单的输入......两者之一。在这种情况下，它被用作输入，所以我不能也将它用作总线。该死。那好吧。
Nevermind, I found the answer. Its BOTH a bus and a simple input... either one or the other. In this case, its being used as an input so I can't also use it as a bus. Darn. Oh well.