It is particularly noteworthy that for 31 pin (EA), when it is connected with high power level, the MCU starts to execute from 0000H of internal ROM after resetting; when it is connected with low power level, it starts to execute directly from 0000H of external ROM after resetting. Because we store the program in the MCU, EA should be connected to high level to ensure that the MCU reads the program from the inside to execute<br>
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