问题描述
我正在使用 arduino isp 对 ATtiny2313 avr 微控制器进行编程.这是问题，当我使用默认保险丝值对 avr 芯片进行编程时，一切正常.但是，我更改了保险丝字节，因为我想使用外部 16 MHz 晶体.当我将 lfuse 值从 0x64 更改为 0xff 时(根据保险丝位的计算)，微控制器停止响应.
i am using arduino isp to program a ATtiny2313 avr microcontroller.Here is the probelm,when i was programming the avr chip using the default fuse values, everything worked just fine.But then, i changed the fuse bytes as i wanted to use an external 16 MHz crystal.When i changed the lfuse value from 0x64 to 0xff (as per the calculation of the fuse bits), the microcontroller stopped responding.
现在每次我尝试使用 arduino uno isp 对微控制器进行编程时，我都会收到一条错误消息:avrdude:哎呀！设备签名无效.avrdude:ATtiny2313 的预期签名是 1E 91 0A
Now everytime i try to program the microcontroller using arduino uno isp, i get an error message :avrdude: Yikes! Invalid device signature.avrdude: Expected signature for ATtiny2313 is 1E 91 0A
然后验证后显示的熔断器字节，很奇怪都设置为 0x00 :avrdude: 安全模式: 保险丝正常 (H:00, E:00, L:00)
and then the fuse bytes shown after verification, very strangely are all set to 0x00 :avrdude: safemode: Fuses OK (H:00, E:00, L:00)
我不明白到底发生了什么，我花了几个小时试图找出问题所在.
i dont understand what the hell is happening and i have spent hours trying to figure out the probelm.
编程时是否应该将16Mhz晶振连接到微控制器?
should the 16Mhz crystal be connected to the microcontroller while programming ?
请帮助！
推荐答案
是的.当您更改配置位以使用外部振荡器时，不再使用内部振荡器 - 包括在编程期间.芯片只是停留在复位状态，直到它被提供一个外部时钟信号.当 ISP 试图读出一个值时，它只是看到数据线卡在复位状态 - 这是所有 0x00 值的来源.
Yes. When you change the configuration bits to use the external oscillator, the internal oscillator is no longer utilised - including during programming. The chip is just stuck in reset until it is provided with an external clock signal. When the ISP attempts to read out a value it is just seeing the data line stuck in the reset state - which is where all the 0x00 values are coming from.
将晶体或信号发生器连接到 CLOCKIN 引脚，您应该能够再次与芯片通话.
Hook up the crystal or a signal generator to the CLOCKIN pin and you should be able to talk to the chip again.
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