1、/在32.768KHz頻率下功耗很低兩節電吃模式下：870uA，單節電池模式：1.238ma/本例注意發生時鐘報警事件后，振蕩器故障報警事件也發生#include <C8051F930.h> / SFR declarations#define uint unsigned int#define uchar unsigned char #define ulong unsigned long int#define nop() _nop_();_nop_();_nop_();_nop_();union tcfint32 ulong mydword;structuchar by4;uchar

2、 by3;uchar by2;uchar by1;bytes;mylongint;/用聯合體定義32位操作#define SYSCLK 20000000 / 定義系統頻率 #define RTCCLK 32768 / 定義smaRTClock 頻率 #define WAKE_INTERVAL 2000 /喚醒時間間隔 #define SUSPEND 0x40 /定義 掛起方式PMU0CF值#define SLEEP 0x80 / 定義休眠方式PMU0CF值#define POWER_MODE SUSPEND #define LED_ON 0#define LED_OFF 1#define CA

3、PTURE0 0x00 / 定義smaRTClock內部寄存器CAPTURE0 地址#define CAPTURE1 0x01 / 定義smaRTClock內部寄存器 CAPTURE1 地址#define CAPTURE2 0x02 /定義smaRTClock內部寄存器 CAPTURE2 地址#define CAPTURE3 0x03 /定義smaRTClock內部寄存器CAPTURE3 地址#define RTC0CN 0x04 / 定義smaRTClock內部寄存器 RTC0CN 地址 #define RTC0XCN 0x05 / 定義smaRTClock內部寄存器 RTC0XCN 地址

4、#define RTC0XCF 0x06 / 定義smaRTClock內部寄存器 RTC0XCF 地址#define RTC0PIN 0x07 / 定義smaRTClock內部寄存器RTC0PIN 地址 #define ALARM0 0x08 / 定義smaRTClock內部寄存器 ALARM0 地址 #define ALARM1 0x09 / 定義smaRTClock內部寄存器ALARM1 地址 #define ALARM2 0x0A / 定義smaRTClock內部寄存器ALARM2 地址 #define ALARM3 0x0B / 定義smaRTClock內部寄存器 ALARM3 地址

5、sbit RED_LED=P15; sbit YELLOW_LED=P16; sbit s1=P02; sbit s2=P03; /-/ 函數聲明/- void PCA_Init(); void PORT_Init (void);void smaRTClock_Init (void);void OSCILLATOR_Init (void);uchar RTC_Read (uchar);void RTC_Write (uchar, uchar);void Timer2_Init (int counts);void TIMER2_ISR(void);/-/ main() 函數/-void main

6、 (void)uchar wakeup_source; PCA_Init(); PORT_Init(); PORT_Init (); OSCILLATOR_Init (); smaRTClock_Init (); / Initialize RTC Timer2_Init (SYSCLK / 12 / 10); / Init Timer2 to generate interrupts / at a 10 Hz rate. EA = 1; / Enable global interrupts /- / Main Application Loop /- while (1) if(PMU0CF &am

7、p; 0x0C) /發生 smaRTClock報警或者時鐘丟失事件 if(PMU0CF & 0x08) /檢查時鐘是否有效 EA = 0; YELLOW_LED = LED_ON; RED_LED = LED_ON; / while(1); /發生時鐘報警事件后，也發生了振蕩器報警 / Configure the Port I/O for Sleep Mode RED_LED = LED_OFF; / Turn off the LED or other / high-current devices / Place the device in Sleep Mode PMU0CF = 0x

8、20; / Clear all wake-up flags YELLOW_LED = LED_ON; PMU0CF = (POWER_MODE | 0x0C); YELLOW_LED = LED_OFF; wakeup_source = PMU0CF & 0x1F; PMU0CF = 0x20; if(wakeup_source & 0x10) EA = 0; YELLOW_LED = LED_ON; RED_LED = LED_ON; while(1); if(wakeup_source & 0x08) EA = 0; YELLOW_LED = LED_ON; RED

9、_LED = LED_ON; while(1); if(wakeup_source & 0x04) /-/端口初始化/-void PORT_Init (void) P0MDIN |= 0x0C; / P0.2, P0.3 are digital P1MDIN |= 0x60; / P1.5, P1.6 are digital P0MDOUT &= 0x0C; / P0.2, P0.3 are open-drain P1MDOUT |= 0x60; / P1.5, P1.6 are push-pull P0 |= 0x0C; / Set P0.2, P0.3 latches to

10、 '1' XBR2 = 0x40; / Enable crossbar and enable / weak pull-ups/-/ smaRTClock 初始化/- void smaRTClock_Init (void) uchar i; uchar CLKSEL_SAVE = CLKSEL; /保存系統時鐘 RTC0KEY = 0xA5; / 時鐘解鎖 RTC0KEY = 0xF1; RTC_Write (RTC0XCN, 0xC0); /使能自動增益控制，選擇時鐘為晶體模式 RTC_Write (RTC0XCF, 0x88); / 使能電容負載步進到設定值 RTC_Writ

11、e (RTC0CN, 0x80); / 使能 smaRTClock 振蕩器 CLKSEL = 0x74; / 將時鐘切換到片內低功耗時鐘并128分頻此時系統頻率約156KHz for (i=0xFF;i!=0;i-); /等待2ms while (RTC_Read (RTC0XCN) & 0x10)= 0x00); /查詢時鐘有效位 while (RTC_Read (RTC0XCF) & 0x40)= 0x00); /查詢負載電容就序位 RTC_Write (RTC0CN, 0xC0); / 使能 smaRTClock 丟失檢測 for (i=0xFF;i!=0;i-); /等

12、待2ms PMU0CF = 0x20; /清除電源管理喚醒源標志 CLKSEL = CLKSEL_SAVE; / 恢復系統時鐘 mylongint.mydword=(RTCCLK * WAKE_INTERVAL) / 1000L); /設置時鐘報警值 RTC_Write (ALARM0, mylongint.bytes.by1); / Least significant byte RTC_Write (ALARM1, mylongint.bytes.by2); RTC_Write (ALARM2, mylongint.bytes.by3); RTC_Write (ALARM3, mylongi

13、nt.bytes.by4); / Most significant byte RTC_Write (RTC0CN, 0xDC); /使能 smaRTClock定時報警自動復位 /-/ 時鐘初始化/-/-void OSCILLATOR_Init (void) RSTSRC = 0x06; CLKSEL = 0x04; / 選擇片內20Mhz低功耗振蕩器，分頻系數選1 /-/PCA初始化函數/- void PCA_Init() PCA0MD &= 0x40; PCA0MD = 0x00; /- /smaRTClock 讀函數/-uchar RTC_Read (uchar reg) reg

14、&= 0x0F; RTC0ADR = reg; / 設置RTC內部存儲器地址 RTC0ADR |= 0x80; / 置1 BUSY 位 讀數據 while (RTC0ADR & 0x80) = 0x80); /查詢 BUSY 位 return RTC0DAT; / 返回讀取值/- /smaRTClock 寫函數/-void RTC_Write (uchar reg, uchar value) reg &= 0x0F; RTC0ADR = reg; / 設置RTC內部存儲器地址 RTC0DAT = value; / 寫數據 while (RTC0ADR & 0x80) = 0x80); /查詢 BUSY 位 /-/ Timer2_Init/- /void Timer2_Init (int counts) TMR2CN = 0x00; / Stop Timer2; Clear TF2; / use SYSCLK/12 as timebase CKCON &= 0x60; / Timer2 clocked based on T2XCLK; TMR2RL = -coun