举个例子 51为例
#define PIN_0 0x01
#define PIN_1 0x02
#define PIN_2 0x04
#define PIN_3 0x08
#define PIN_4 0x10
#define PIN_5 0x20
#define PIN_6 0x40
#define PIN_7 0x80
P1 |= (uint8_t)(PIN_1|PIN_0); //置1
P1 &= (uint8_t)(~ (PIN_1|PIN_0)); //置0