这个是网上中文手册的内容：
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通过 JTAG 对 AVR器件进行编程仅需要使用 JTAG 端口的四个引脚—TCK, TMS, TDI 和
TDO(除了电源引脚)。编程不需要额外的12V电压。使能JTAG测试访问端口需要首先编程
JTAGEN 熔丝位，同时保证 MCUCR 寄存器的 JTD 被清零。
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这是原英文手册的内容：
Using the JTAG Programming of AVR parts via JTAG is performed via the 4-pin JTAG port, TCK, TMS, TDI and
Programming TDO. These are the only pins that need to be controlled/observed to perform JTAG program-
ming (in addition to power pins). It is not required to apply 12V externally. The JTAGEN Fuse
Capabilities
must be programmed and the JTD bit in the MCUSR Register must be cleared to enable the
JTAG Test Access Port.
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must be programmed and the JTD bit in the MCUSR Register must be cleared to enable the
JTAG Test Access Port.
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