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请帮我确认下TM4C1290NCPDTI3R的PA2/PA3是否支持UART ISP下载吗，如果支持启动ISP下载需要怎么操作（是否需要上拉下拉某个IO口）？
Hi wu,
看一下这篇文档，里面有详细的操作流程：
spma074a_Implementation of Programmer for Serial Bootloaders on TM4C12x Microcontroller (Rev. A)
