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手冊(cè)里的范例程序：
//測(cè)試工作頻率為 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P0M0 = 0x94;
sfr P0M1 = 0x93;
sfr P1M0 = 0x92;
sfr P1M1 = 0x91;
sfr P2M0 = 0x96;
sfr P2M1 = 0x95;
sfr P3M0 = 0xb2;
sfr P3M1 = 0xb1;
sfr P4M0 = 0xb4;
sfr P4M1 = 0xb3;
sfr P5M0 = 0xca;
sfr P5M1 = 0xc9;
sfr P6M0 = 0xcc;
sfr P6M1 = 0xcb;
sfr P7M0 = 0xe2;
sfr P7M1 = 0xe1;
void main()
{
P0M0 = 0x00; //設(shè)置 P0.0~P0.7 為雙向口模式
P0M1 = 0x00;
P1M0 = 0xff; //設(shè)置 P1.0~P1.7 為推挽輸出模式
P1M1 = 0x00;
P2M0 = 0x00; //設(shè)置 P2.0~P2.7 為高阻輸入模式
P2M1 = 0xff;
P3M0 = 0xff; //設(shè)置 P3.0~P3.7 為開漏模式
P3M1 = 0xff;
while (1);
} |
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