pic单片机定时器1实现按键按下后松开，灯开始一秒钟闪一次

以下是基于PIC单片机的定时器1实现按键按下后松开，灯开始一秒钟闪一次的示例代码：

#include <xc.h> // XC8 General Include File
#pragma config FOSC = INTRCIO, WDTE = OFF, PWRTE = OFF, MCLRE = OFF, CP = OFF, CPD = OFF, BOREN = OFF, IESO = OFF, FCMEN = OFF

#define _XTAL_FREQ 4000000 // Set internal oscillator frequency

void main(void) {
    TRISBbits.TRISB0 = 1; // Set RB0 as input
    TRISBbits.TRISB1 = 0; // Set RB1 as output
    ANSEL = 0; // Set all analog pins as digital
    ANSELH = 0;
    OPTION_REGbits.nRBPU = 0; // Enable internal pull-up resistor for PORTB
    WPUBbits.WPUB0 = 1; // Enable pull-up for RB0

    T1CONbits.TMR1CS = 0; // Select internal clock for Timer1
    T1CONbits.T1CKPS = 0b11; // Set prescaler to 1:8
    T1CONbits.TMR1ON = 0; // Disable Timer1 initially

    while (1) {
        if (PORTBbits.RB0 == 0) { // If button is pressed
            T1CONbits.TMR1ON = 1; // Enable Timer1
            while (PORTBbits.RB0 == 0); // Wait for button release
            T1CONbits.TMR1ON = 0; // Disable Timer1
            PORTBbits.RB1 = 1; // Turn on LED
            __delay_ms(1000); // Wait for 1 second
            PORTBbits.RB1 = 0; // Turn off LED
        }
    }
}

此代码中，我们将RB0设置为输入，RB1设置为输出，并启用了PORTB的内部上拉电阻。当按下按钮时，我们启用了Timer1，它每秒钟会产生一个中断。我们等待按键释放，然后禁用Timer1并打开LED一秒钟。