利用带隙电压获取新塘单片机N76E003芯片电压VDD

1、【1】打开集成开发环境Keil并建立好相应C51工程。【2】在创建工程时Device选择Nuvoton 8051 Devices-->E76E003。前提要安装好Keil插件，否则找不到芯片型号，插件必须安装在Keil的根目录下。【3】我是将Keil C51和Keil ARM安装在同一个根目录下，所以他们两个的图标相似，最主要是代码的放大缩小很方便。【4】设置Output生成.hex文件的位置和Listing文件的位置，必须将Create HEX Files前打勾。

2、【1】编写串口驱动驱动程序，设置波特率为9600pbs，8位数据位，1位停止位，无奇偶校验。串口驱动驱动程序可以直接用官方给的Demo。void InitialUART1_Timer3(u32 u32Baudrate)//Initial UART1 Timer3【2】编写简单的延时函数，也可以使用官方提供的延时函数，官方给的延时函数使用定时器，提前是你不使用这个定时器，否则这个延时函数不准或出错。void Timer0_Delay1ms(u32 u32CNT)//Timer0 Delay 1ms【3】编写获取带隙电压（Band-gap）函数，这个函数在数据数据手册上有， ADC那一章有讲解。获取带隙电压需要用到IAP功能读取固化到Flash中的内容。void vGet_BandGap_VoltageValue(void)//xGet Band Gap Voltage Value【4】编写获取当前芯片的电压值。double xGet_PowerSource_Voltage(void)//xGet Power Source Voltage【5】编写printf函数的重定向char putchar (char c)//UART1 printf

3、【1】串口驱动驱动程序void InitialUART1_Timer3(u32 u32Baudrate)//Initial UART1 Timer3{ P02_Quasi_Mode; //Setting UART pin as Quasi mode for transmit P16_Quasi_Mode; //Setting UART pin as Quasi mode for transmit SCON_1 = 0x50; //UART1 Mode1,REN_1=1,TI_1=1 T3CON = 0x08; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1), UART1 in MODE 1 clr_BRCK; #ifdef FOSC_160000 RH3 = HIBYTE(65536 - (1000000/u32Baudrate)-1); //16 MHz RL3 = LOBYTE(65536 - (1000000/u32Baudrate)-1); #endif #ifdef FOSC_166000 RH3 = HIBYTE(65536 - (1037500/u32Baudrate)); //16.6 MHz RL3 = LOBYTE(65536 - (1037500/u32Baudrate)); #endif set_TR3; //Trigger Timer3 TI_1 = 1; //For printf function must setting TI = 1}【2】延时函数void Timer0_Delay1ms(u32 u32CNT)//Timer0 Delay 1ms{ clr_T0M; //T0M=0, Timer0 Clock = Fsys/12 TMOD |= 0x01; //Timer0 is 16-bit mode set_TR0; //Start Timer0 while (u32CNT != 0) { TL0 = LOBYTE(TIMER_DIV12_VALUE_1ms); //Find define in "Function_define.h" "TIMER VALUE" TH0 = HIBYTE(TIMER_DIV12_VALUE_1ms); while (TF0 != 1); //Check Timer0 Time-Out Flag clr_TF0; u32CNT --; } clr_TR0; //Stop Timer0}【3】获取带隙电压（Band-gap）函数BandGapStruct BanGapStruct;void vGet_BandGap_VoltageValue(void)//xGet Band Gap Voltage Value{ double bandGapVoltage = 0; u16 bandGapValue = 0; u8 bandGapHigh=0, bandGapLow=0, BandgapMark=0; IAP_ENABLE; IAPCN = READ_UID; IAPAL = 0X0D; IAPAH = 0X00; IAP_START_PROGRAMEE; bandGapLow = IAPFD; BandgapMark = bandGapLow&0XF0; switch(BandgapMark) { case 0X00 : { bandGapLow = bandGapLow&0X0F; IAPAL = 0X0C; IAPAH = 0X00; IAP_START_PROGRAMEE; bandGapHigh = IAPFD; bandGapValue = (((u16)bandGapHigh)<<4) + bandGapLow; bandGapVoltage = (bandGapValue*3)/4; } break; case 0X80 : { bandGapLow = bandGapLow&0X0F; IAPAL = 0X0C; IAPAH = 0X00; IAP_START_PROGRAMEE; bandGapHigh = IAPFD; bandGapValue = (((u16)bandGapHigh)<<4) + bandGapLow; bandGapVoltage = ((bandGapValue*3)/4) - 33; } break; case 0X90 : { IAPAL = 0X0E; IAPAH = 0X00; IAP_START_PROGRAMEE; bandGapHigh = IAPFD; IAPAL = 0X0F; IAPAH = 0X00; IAP_START_PROGRAMEE; bandGapLow = IAPFD; bandGapLow = bandGapLow&0X0F; bandGapValue = (((u16)bandGapHigh)<<4) + bandGapLow; bandGapVoltage = (bandGapValue*3)/4; } break; default : break; } IAP_DISABLE; BanGapStruct.Voltage = bandGapVoltage;}【4】获取当前芯片的电压值double xGet_PowerSource_Voltage(void)//xGet Power Source Voltage{ double powerVolatge = 0; double powerADC = 0; u16 powerADCH=0, powerADCL=0; u8 adcDataH[5]={0}, adcDataL[5]={0}; u8 i = 0; Enable_ADC_BandGap; CKDIV = 0X02; for(i=0; i<5; i++) { ADC_CLR_FALG; ADC_START_CONVERT; while(!ADCF); adcDataH[i] = ADCRH; adcDataL[i] = ADCRL; } CKDIV = 0X00; for(i=2; i<5; i++) { powerADCH += adcDataH[i]; powerADCL += adcDataL[i]; } adcDataH[0] = ((u8)(powerADCH/3)); adcDataL[0] = ((u8)(powerADCL/3)); powerADC = (((u16)adcDataH[0])<<4) + adcDataL[0]; powerVolatge = (0X1000/powerADC)*BanGapStruct.Voltage; return powerVolatge;}【5】printf函数的重定向char putchar (char c)//UART1 printf{ while (!TI_1);//wait until transmitter ready TI_1 = 0; SBUF_1 = c;//output character return (c);}

4、编写主函数。先要获取获取带隙电压，才能获取当前芯片电压void main(void){ Set_All_GPIO_Quasi_Mode; InitialUART1_Timer3(9600); vGet_BandGap_VoltageValue(); while(1) { printf("Current Voltage : %f mV", xGet_PowerSource_Voltage()); Timer0_Delay1ms(3000); } }

5、【1】编译并检查错误，直到程序正确为此。【2】N76E003的时钟默认为16MHZ，宏定义系统时钟，否则串口配置无效，串口配置中有一个条件编译，所以需要宏定义，我这里直接定义在编译器中。

6、【1】将程序下载到芯片中，也就是下载.hex到芯片中。【2】通过串口调试助手参看当前电压值，调节当前电压值再次查看串口调试助手打印的信息，已验证程序的正确性，也可以用万用表直接测量此时芯片的电压，看是否相正确。