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    ʵʱʱÖÓRTC
    ʱ¼ä£º2018-08-16×÷Õߣº»ªÇåÔ¶¼û

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    1 RTC½éÉÜ

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    ͼ12-1 RTCÍâ½Óµç·

    2 RTC¿ØÖÆÆ÷

    ʵʱʱÖÓ£¨RTC£©µ¥Ôª¿ÉÒÔͨ¹ý±¸ÓÃµç³Ø¹©µç£¬Òò´Ë£¬¼´Ê¹ÏµÍ³µçÔ´¹Ø±Õ£¬ËüÒ²¿ÉÒÔ¼ÌÐø¹¤×÷¡£RTC ¿ÉÒÔͨ¹ýSTRB/LDRB Ö¸Á8 λBCD ÂëÊý¾ÝËÍÖÁCPU¡£ÕâЩBCD Êý¾Ý°üÀ¨Ãë¡¢·Ö¡¢Ê±¡¢ÈÕÆÚ¡¢ÐÇÆÚ¡¢ÔºÍÄê¡£RTC µ¥ÔªÍ¨¹ýÒ»¸öÍⲿµÄ32.768kHz¾§ÕñÌṩʱÖÓ¡£RTC¾ßÓж¨Ê±±¨¾¯µÄ¹¦ÄÜ£¬Èçͼ2Ëùʾ¡£RTC ¿ØÖÆÆ÷¹¦ÄÜ˵Ã÷£º


    ͼ12-2 RTC¿ØÖÆÆ÷

    ¡ñ Ê±ÖÓÊý¾Ý²ÉÓÃBCD ±àÂë¡£
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    3 RTC¿ØÖÆÆ÷¼Ä´æÆ÷Ïê½â

    Èç±í3ËùʾΪÏà¹Ø¼Ä´æÆ÷ÃèÊö¡£

    ±í3 RTC¿ØÖƼĴæÆ÷

    RTCCON λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:9] ±£Áô 0
    TICEN [8] àÖ઼ÆÊ±Æ÷
    0 = ½ûÖ¹
    1 = ʹÄÜ
    0
    TICCKSEL [7:4] àÖ઼ÆÊ±Æ÷×ÓʱÖÓÔ´Ñ¡Ôñ
    4'b0000 = 32768 Hz       4'b0001 = 16384 Hz
    4'b0010 = 8192 Hz        4'b0011 = 4096 Hz
    4'b0100 = 2048 Hz        4'b0101 =1024 Hz
    4'b0110 =512 Hz          4'b0111 =256 Hz
    4'b1000 =128 Hz          4'b1001 =64 Hz
    4'b1010 =32 Hz           4'b1011 =16 Hz
    4'b1100 =8 Hz            4'b1101 =4 Hz
    4'b1110 =2 Hz            4'b1111 =1 Hz
    4'b0000
    CLKRST [3] RTCʱÖÓ¼ÆÊý¸´Î»
    0 = ²»¸´Î»
    1 = ¸´Î»
    0
    CNTSEL [2] BCD¼ÆÊýÑ¡Ôñ
    0 = ·ÖÅä BCD ¼ÆÊý
    1 = ±£Áô
    0
    CLKSEL [1] BCD ʱÖÓÑ¡Ôñ
    0 = XTAL 1/2 divided clock
    1 = ±£Áô£¨XTAL ¹©Æµ£©
    0
    RTCEN [0] RTC¿ØÖÆÊ¹ÄÜ
    0 = ½ûÖ¹
    1 = ʹÄÜ
    0

    Èç±í4ËùʾΪBCDÃë¼Ä´æÆ÷ÃèÊö¡£

    ±í4 BCDSEC¼Ä´æÆ÷

    BCDSEC λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:7] ±£Áô --
    SECDATA [6:4] BCD Öµ 0~5 --
    [3:0] 0~9 --

    Èç±í5ËùʾΪBCD·ÖÖӼĴæÆ÷ÃèÊö¡£

    ±í5 BCDMIN¼Ä´æÆ÷

    BCDMIN λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:7] ±£Áô --
    MINDATA [6:4] BCD Öµ 0~5 --
    [3:0] 0~9 --

    Èç±í6ËùʾΪBCDСʱ¼Ä´æÆ÷ÃèÊö¡£

    ±í6 BCDHOUR¼Ä´æÆ÷

    BCDHOUR λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:7] ±£Áô --
    HOURDATA [5:4] BCD Öµ 0~5 --
    [3:0] 0~9 --

    Èç±í7ËùʾΪBCDÈÕÆÚ¼Ä´æÆ÷ÃèÊö¡£

    ±í7 BCDDATE¼Ä´æÆ÷

    BCDDATE λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:7] ±£Áô --
    DATEDATA [5:4] BCD Öµ 0~3 --
    [3:0] 0~9 --

    Èç±í8ËùʾΪBCDÐÇÆÚ¼Ä´æÆ÷ÃèÊö¡£

    ±í8 BCDDAY¼Ä´æÆ÷

    BCDDAY λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:3] ±£Áô --
    DAYDATA [2:0] 1~7 --

    Èç±í9ËùʾΪBCDÔ¼ĴæÆ÷ÃèÊö¡£

    ±í9 BCDMON¼Ä´æÆ÷

    BCDMON λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:5] ±£Áô --
    MONDATA [4] BCD Öµ 0~1 --
      [3:0] 0~9 --

    Èç±í10ËùʾΪBCDÄê¼Ä´æÆ÷ÃèÊö¡£

    ±í10 BCDYEAR¼Ä´æÆ÷

    BCDYEAR λ ÃèÊö ¸´Î»Öµ
    ±£Áô [31:8] ±£Áô --
    YEARDATA [7:4] BCD Öµ 0~9 --
    [3:0] 0~9 --

    4 RTCÓ¦ÓÃʾÀý

    1£®Ïà¹Ø¼Ä´æÆ÷¶¨Òå

    typedef struct {

                            unsigned int BCDSEC;
                            unsigned int BCDMIN;
                            unsigned int BCDHOUR;
                            unsigned int BCDDATE;
                            unsigned int BCDDAY;
                            unsigned int BCDMON;
                            unsigned int BCDYEAR;
            }rtcbcd;
            #define RTCBCD (* (volatile rtcbcd *)0xEA300070)

    2£®Ö÷³ÌÐò

    ÏÂÃæµÄ´úÂëʵÏÖÁËÒ»¸ö½«RTCµÄÄêÔÂÈÕ¡¢Ê±·ÖÃë¶Á³öµÄ¹¦ÄÜ£¬¿ÉÒÔ½«×¢Ê͵ôµÄ´úÂë´ò¿ªÀ´¸´Î»Öµ¡£

    void rtc_init(void)
            {
                    RTCCON = 0X01; //ʹÄÜRTC¿ØÖÆÐ©¹¦ÄÜ
                    RTCBCD.BCDSEC = 0x0; // 2012 03 15, 12:59:00.ÒÔBCDÂë¸ñʽдÈë
                    RTCBCD.BCDMIN = 0x59; 
                    RTCBCD.BCDHOUR =0x12;
       &nbsnbsp;            RTCBCD.BCDDATE = 0x15;
                    RTCBCD.BCDMON = 0x03;
                    RTCBCD.BCDYEAR = 0x12;
                    RTCCON = 0; //¹Ø±ÕRTC¿ØÖÆÐ©¹¦ÄÜ
            }
            int main()
            {
                    unsigned int i = 0;
                    uart0_init();
                    rtc_init(); //³õʼ»¯Ê±¼ä
                    while(1) //Ñ­»·´òӡʱ¼ä
                    {
                            printf("hour %x : min %x : sec %x\r",RTCBCD.BCDHOUR,RTCBCD.BCDMIN,RTCBCD.BCDSEC);
                            for(i=0;i<10000000;i++);
                    }
                    return 0;
            }

    2£®ÊµÑé¹ý³Ì¼°ÏÖÏó£º

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    hour 12 : min 59 : sec 17
            hour 12 : min 59 : sec 18
            hour 12 : min 59 : sec 19
            hour 12 : min 59 : sec 20


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