Manually extend the external interrupt INT0, INT1, when INT0 interrupt generated when so LED8 bright, blinking out 4 times when INT1 generated interruption, so that LED display from right to left alternately, a two-liang, the cycle 4 times. Press KK1-, observed experimental phenomena, and then press KK2-, observed experimental phenomena. Hardware connection: P1 I take light-emitting diodes D0 ~ D7, INT0 ~ KK1, INT1 ~ KK2

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