p3=0x07是什么意思

在计算机领域中，p3=0x07代表将变量p3赋值为16进制数0x07，即十进制数的7。在计算机中，0x表示后面的数字是16进制数，因此0x07表示的是十进制数的7。在程序中，赋值操作是将某个数或者表达式计算的结果存储在指定的变量当中，这样在后续的程序中就可以使用这个变量的数值进行计算或者进行其他操作。

例如，在C语言中，可以通过以下代码将p3赋值为0x07：

p3 = 0x07;

这表示变量p3的值为7。在程序中，可以使用p3这个变量来进行数值运算或者作为逻辑判断的条件等。因此，p3=0x07表示将变量p3的值设定为16进制数0x07所代表的数值。

相关问题

#include "reg51.h" #include "intrins.h" #define FOSC 11059200UL #define BRT (65536 - FOSC / 115200 / 4) sfr AUXR = 0x8e; sfr T2H = 0xd6; sfr T2L = 0xd7; sfr S2CON = 0x9a; sfr S2BUF = 0x9b; sfr IE2 = 0xaf; sfr P0M1 = 0x93; sfr P0M0 = 0x94; sfr P1M1 = 0x91; sfr P1M0 = 0x92; sfr P2M1 = 0x95; sfr P2M0 = 0x96; sfr P3M1 = 0xb1; sfr P3M0 = 0xb2; sfr P4M1 = 0xb3; sfr P4M0 = 0xb4; sfr P5M1 = 0xc9; sfr P5M0 = 0xca; bit busy; char wptr; char rptr; char buffer[16]; void Uart2Isr() interrupt 8 { if (S2CON & 0x02) { S2CON &= ~0x02; busy = 0; } if (S2CON & 0x01) { S2CON &= ~0x01; buffer[wptr++] = S2BUF; wptr &= 0x0f; } } void Uart2Init() { S2CON = 0x10; T2L = BRT; T2H = BRT >> 8; AUXR = 0x14; wptr = 0x00; rptr = 0x00; busy = 0; } void Uart2Send(char dat) { while (busy); busy = 1; S2BUF = dat; } void Uart2SendStr(char *p) { while (*p) { Uart2Send(*p++); } } void main() { P0M0 = 0x00; P0M1 = 0x00; P1M0 = 0x00; P1M1 = 0x00; P2M0 = 0x00; P2M1 = 0x00; P3M0 = 0x00; P3M1 = 0x00; P4M0 = 0x00; P4M1 = 0x00; P5M0 = 0x00; P5M1 = 0x00; Uart2Init(); IE2 = 0x01; EA = 1; Uart2SendStr("Uart Test !\r\n"); while (1) { if (rptr != wptr) { Uart2Send(buffer[rptr++]); rptr &= 0x0f; } } } 修改此程序使发送者发送字母o接收者连接的板子中端口P2.5灯开始亮其余灯灭

修改后的程序如下：

#include "reg51.h"
#include "intrins.h"

#define FOSC 11059200UL
#define BRT (65536 - FOSC / 115200 / 4)

sfr AUXR = 0x8e;
sfr T2H = 0xd6;
sfr T2L = 0xd7;
sfr S2CON = 0x9a;
sfr S2BUF = 0x9b;
sfr IE2 = 0xaf;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;

bit busy;
char wptr;
char rptr;
char buffer[16];

void Uart2Isr() interrupt 8 {
    if (S2CON & 0x02) {
        S2CON &= ~0x02;
        busy = 0;
    }
    if (S2CON & 0x01) {
        S2CON &= ~0x01;
        buffer[wptr++] = S2BUF;
        wptr &= 0x0f;
    }
}

void Uart2Init() {
    S2CON = 0x10;
    T2L = BRT;
    T2H = BRT >> 8;
    AUXR = 0x14;
    wptr = 0x00;
    rptr = 0x00;
    busy = 0;
}

void Uart2Send(char dat) {
    while (busy);
    busy = 1;
    S2BUF = dat;
}

void Uart2SendStr(char *p) {
    while (*p) {
        Uart2Send(*p++);
    }
}

void main() {
    P0M0 = 0x00;
    P0M1 = 0x00;
    P1M0 = 0x00;
    P1M1 = 0x00;
    P2M0 = 0x00;
    P2M1 = 0x00;
    P3M0 = 0x00;
    P3M1 = 0x00;
    P4M0 = 0x00;
    P4M1 = 0x00;
    P5M0 = 0x00;
    P5M1 = 0x00;

    Uart2Init();
    IE2 = 0x01;
    EA = 1;

    Uart2SendStr("Uart Test !\r\n");

    while (1) {
        if (rptr != wptr) {
            char received = buffer[rptr++];
            rptr &= 0x0f;

            if (received == 'o') {
                P2 = 0x20;
            } else {
                P2 = 0x00;
            }

            Uart2Send(received);
        }
    }
}

其中，修改的部分为：

if (received == 'o') {
    P2 = 0x20;
} else {
    P2 = 0x00;
}

该部分代码会检测接收到的字符是否为字母'o'，如果是，则点亮P2.5灯（二进制为0010 0000），否则将P2口置为0（灭灯）。

调节以下代码，使得占空比在10%~60%之间可调： #include "stc32g.h" #include "intrins.h " void main() { EAXFR=1; CKCON =0x00; WTST= 0x00; P0M0 = 0x00; P0M1 = 0x00; P1M0= 0x00; P1M1= 0x00; P2M0 = 0x00; P2M1 = 0x00; P3M0 = 0x00; P3M1 = 0x00; P4M0 = 0x00; P4M1 = 0x00; P5M0 = 0x00; P5M1= 0x00; PWMA_CCER1=0x00; PWMA_CCMR1 =0x60; //ÉèΪPWMģʽ PWMA_CCMR2 =0x60; //ÉèΪPWMģʽ PWMA_CCER1= 0x11; PWMA_CCR1H = 0x01; // Õ¼¿Õ±È1/3 PWMA_CCR1L= 0x00; PWMA_CCR2H = 0x02; // Õ¼¿Õ±È2/3 PWMA_CCR2L= 0x00; PWMA_ARRH= 0x03; //×ÜÖÜÆÚ PWMA_ARRL= 0x00; PWMA_ENO=0x05; //ʹÄÜPWM1ºÍ2 PWMA_PS=0x0A; //ÅäÖÃÊä³ö¹Ü½ÅΪP6 PWMA_BKR= 0x80; PWMA_CR1=0x01; while (1); }

要调节代码以实现占空比在10%~60%之间可调，需要修改以下部分：

PWMA_CCR1H = 0x01;  // Õ¼¿Õ±È1/3
PWMA_CCR1L = 0x00;
PWMA_CCR2H = 0x02;  //  Õ¼¿Õ±È2/3
PWMA_CCR2L = 0x00;

将上述代码修改为：

PWMA_CCR1H = 0x00;  // 将占空比调节为10%
PWMA_CCR1L = 0x0A;
PWMA_CCR2H = 0x00;  // 将占空比调节为10%
PWMA_CCR2L = 0x0A;

这样可以将占空比调节为10%，你可以根据需要将占空比调整到60%。