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A EMC test om XC16X

There is a problem in our application by using XC167-32F40. In the application,we use MC7805 as Peripheral Units PowerSupply,and LM1117 as CPU's PowerSupply.We take a EMC test for PowerSupply(7637-2b),and while the test is finish,the CPU is not working until give the /RESET a reset signal. By the way ,in our software,we use WDT module,but still no effect on this state. I hope for your help dealing with the problem .Thank you.