單片機P1.6 P1.7設(shè)置高阻的問題

ID:299872 · 發(fā)表于 2019-3-19 06:49

sfr P1M1 = 0x91; //PxM1.n,PxM0.n    =00--->Standard, 01--->push-pull
sfr P1M0 = 0x92; //                =10--->pure input,  11--->open drain
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xB1;
sfr P3M0 = 0xB2;
sfr P4M1 = 0xB3;
sfr P4M0 = 0xB4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;

  P0M1 = 0; P0M0 = 0; //設(shè)置為準雙向口
P1M1 = 0; P1M0 = 0; //設(shè)置為準雙向口
P2M1 = 0; P2M0 = 0; //設(shè)置為準雙向口
P3M1 = 0; P3M0 = 0; //設(shè)置為準雙向口
P4M1 = 0; P4M0 = 0; //設(shè)置為準雙向口
P5M1 = 0; P5M0 = 0; //設(shè)置為準雙向口
P6M1 = 0; P6M0 = 0; //設(shè)置為準雙向口
P7M1 = 0; P7M0 = 0; //設(shè)置為準雙向口

上面部份是我的看范例.
如果要設(shè)置P1.7 P1.6高阻態(tài)
是不是應(yīng)該是這樣的呀?
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;

  P6M1 = 1; P6M0 = 0;
P7M1 = 1; P7M0 = 0;

ID:213173 · 發(fā)表于 2019-3-19 13:11

如果用51頭文件因不含以下特殊寄存器，需要聲明,用STC頭文件不需要聲明。
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
設(shè)置P1.6/P1.7高阻方法
P1M1 = 0xc0; //1100 0000
P1M0 = 0x00; //0000 0000

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