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CC2640: CC2640R2F IO port first power supply issue

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Part Number:CC2640

Dear All

My application is smart electronic lock,CC2640R2 communication with NB module cross UART,

I find CC2640R2(not power on) can send some BT information when NB module send some information cross UART after power on

then,I test TI CC2640 EVM,I find CC2640R2 can nomal work if I only power on IO port,

So I want to know why CC2640 can nomal work when only power on IO port?


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