【经验】中微半导体车规级MCU BAT32A237的RTC如何实现几秒的间隔中断功能

时间： 2022-10-12 来源：世强

技术问答

中微半导体推出的车规级MCU BAT32A237系列符合AEC-Q100汽车产品标准，工作温度为-40℃~125℃，支持32Pin～64Pin的多种QFN、LQFP封装。BAT32A237采用ARM的Cortex-M0+内核，最高可工作于48MHz主频，采用高速的嵌入式闪存（SRAM最大16KB，Flash最大128KB）。集成I²C、SPI、UART、LIN、CAN总线等多种标准接口，集成12bit ADC、温度传感器、8bit DAC、比较器，可编程增益放大器。BAT32A237还具有出色的低功耗性能，运行功耗为120μA/MHz@48MHz，在深度睡眠模式下功耗仅0.7μA。BAT32A237优秀的可靠性、丰富的集成外围功能以及出色的低功耗性能，广泛适用于车载产品的开发。

BAT32A237集成RTC实时时钟功能，当MCU外部没有使用32.768kHz晶振时，RTC可以采用内部的低速15kHz振荡器，但是不能进行年月日计数，只能使用固定周期中断功能。如图1所示。

图1 RTC使用注意事项

使用RTC的固定周期中断功能，可以通过图2的寄存器进行配置选择对应的间隔时间。从图中可以看出，只能配置为1秒、1分、1小时等固定的周期，如果想实现几秒、几分等时间周期中断，是否可以实现？

图2 固定周期中断间隔时间配置

要实现这种功能，可以采用DMA方式实现，在程序中加入下述代码：

DMAVEC->VEC[DMA_VECTOR_IT] = 5;

DMAVEC->CTRL[5].DMACR = (0 << CTRL_DMACR_SZ_Pos) | (0 << CTRL_DMACR_CHNE_Pos) | \

(0 << CTRL_DMACR_DAMOD_Pos) | (0 << CTRL_DMACR_SAMOD_Pos) | \

(1 << CTRL_DMACR_MODE_Pos) | (1 << CTRL_DMACR_RPTINT_Pos) | (0 << CTRL_DMACR_RPTSEL_Pos);

DMAVEC->CTRL[5].DMBLS = 1;

DMAVEC->CTRL[5].DMACT = 30; //因15位间隔定时器中断时间为1s，DMA传输次数为需要的唤醒时间（单位s）

DMAVEC->CTRL[5].DMRLD = 30;

DMAVEC->CTRL[5].DMSAR = (uint32_t)&unuse_buf[0];

DMAVEC->CTRL[5].DMDAR = (uint32_t)&unuse_buf[1];

/* init DMA registers */

CGC->PER1 |= CGC_PER1_DMAEN_Msk;

DMA->DMABAR = DMAVEC_BASE;

DMA_Enable(DMA_VECTOR_IT);

IT_Init(RTC_FSUB, 0x7fff);

IT_Start();

DMA需要在RAM中存储一段控制数据，所以需要在Target界面修改一下RAM的起始地址和大小，空一段区域出来。上面示例代码中“5"是控制数据在RAM中的位置，控制数据占16字节，故空的区域给0x100就可以了。

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曦华CVM012x车载触控MCU正式通过SGS功能安全产品认证

曦华科技CVM012x 系列车载触控MCU产品严格践行ISO26262:2018 标准要求，经国际公认测试、检验和认证机构SGS 独立审核，正式获颁功能安全ASIL-B 产品认证证书，助力曦华科技在国内、国际市场开拓。颁证仪式于SGS及中汽研联合举办的汽车电子芯片认证及功能安全技术开发研讨会同步开展，数十家上下游伙伴、媒体、友商共同见证这一重要时刻。

原厂动态发布时间 : 2024-10-31

昂瑞微电子车规级蓝牙SoC芯片OM6650AM通过权威第三方测试机构AEC-Q100车规级认证

2023年9月，昂瑞微电子车规级蓝牙SoC芯片OM6650AM通过权威第三方测试机构AEC-Q100车规级认证，并已向各大车载应用厂商进行推广。显示了公司在布局车规级芯片产品线方面的实力和决心。

原厂动态发布时间 : 2023-09-23

【媒体视角】降本增效大势所趋，电控MCU内卷加剧，中微半导体如何破局？

中微半导，作为国内电机控制MCU领域的新势力，凭借着在高压控制、智能化应用以及绿色能源技术方面的不断创新，正在为行业内的这些痛点提供新的解决方案。在苏州电动工具控制与充电技术研讨会上，中微半导的电机控制事业部总经理肖英进行了深入讲话，了解了公司如何通过技术创新和成本优化，来破解行业中的这些难题。

原厂动态发布时间 : 2024-10-23

【经验】中微MCU CMS8S6990外部中断的使用方法

在使用中微MCU控制灯光的项目中，需要用到CMS8S6990的外部中断输入，使用P13作为按键的外部中断输入端口，在按照如下方式编写的程序后发现按键无法运行。问题分析：用户使用的外部中断方式检测按键输入，但是使用的却是读IO端口判断按键是否有输入。

设计经验发布时间 : 2023-01-29

Cmsemicon Newly Launches 32-bit Industrial-Grade MCU BAT32G439 Series Operating at a Frequency of 128MHz

Cmsemicon recently expanded its BAT32G series with the addition of the 32-bit industrial-grade MCU family member, BAT32G439. It supports an industrial temperature range of -40℃ to 105℃, offering high reliability, rich peripheral resources, and powerful digital signal processing capabilities.

产品发布时间 : 2024-08-23