1) Set three variables, if A, B, C, where A in the main program loop count, the count interval of 1 second or so (need not be very precise), cycle count from 0-9 B program in the external interrupt 0 counting, counting interval is 1 second or so (need not be very precise), counts from 0 to 9, interrupt exit C program in the external interrupt 2 count, the count interval is 1 second or so (need not be very precise), counts from 0 to 9, interrupt exit 0,1 using falling edge triggered external interrupt, triggered by the button. In order to facilitate the observation, P1 is connected to the digital control, P2.0-P2.2 corresponds to A, B, C count strobe, each counted once, the variable output to digital, is displayed in the main program of digital tube 4, Interrupt 0 5 in the digital display, digital display interrupt an inside tube 6. Set External Interrupt 0 is a senior interrupt, external interrupt 1 is lower interrupt. LED display keys change the order observed.

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