Hi Ki-Soo Lee, Thanks for suggestion. we connect 1k resistor as you suggest and after test our module but our restart problem is not solve. Below mention test case after additional 1k resistor between RC (R5, C6) circuit and RST pin. R5=47k C6=2.2nF restart every MCU 5 sec./ no problem debugging and programing R5=47k C6=100nF restart every MCU 10 sec/no problem debugging and programing R5=47k C6=470nF restart continuously /no problem debugging and programing Kindly provide suggestion how to solve this restart problem. Any help would be appreciated. Thanks in advance. Rearguard's Hiren R. Thumar
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