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常见问答 / 如何避免因主程序切换SFR page后,进出中断子程序所导致不可预期的结果?



Interrupt、SFRS、PUSH、POP 如何避免因主程序切换SFR page后,进出中断子程序所导致不可预期的结果? 1568956860000 若进中断子程序前有改变缓存器 SFRS 的值,则需在中断子程序中增加保存缓存器 SFRS 的指令;同理,退出中断子程序后需恢复缓存器 SFRS 原本的值。 1. Keil C51: 请注意,在使用 _push_(SFRS) 以及 _pop_(SFRS) 指令前需引入头文件 intrins.h。 2. IAR EW8051: 请注意,0x91为缓存器SFRS的地址。


常见问答 / 如何查看复位(Reset)标志?



Reset 如何查看复位(Reset)标志? 1569917520000 系统复位状态寄存器 (SYS_RSTSTS, System Reset Status Register) 会储存曾经发生过的复位信号来源,用户能够透过以下2种方式查看寄存器内的标志: 1. 于项目内调用API “SYS_GetResetSrc()” 2. 在Debug模式下,使用System Viewer查看”SYS_RSTSTS”寄存器的值 注:为了区分系统复位信号的来源,在下一次复位前,需要将SYS_RSTSTS清除为0。


常见问答 / 当Uart Rx与nRESET共享脚位时,如何设定成Uart Rx功能?



nRESET、UART RX、INPUT-ONLY MODE 当Uart Rx与nRESET共享脚位时,如何设定成Uart Rx功能? 1570010400000 以MS51DA9AE为例,在上电后,P2.0可以设定为input-only或者nRESET两种功能,P2.0默认功能为nRESET。在P2.0设定为input-only状态下,才可以透过程序切换P2.0的功能。以Uart Rx为例,需依循以下步骤: 1. 利用 ICP 工具将 MS51DA9AE的RPD (CONFIG0.2) 设为 0,目的是将 P2.0 设为 input-only 模式。 2. 移除 Reset 相关电路,目的是怕 IO 驱动能力不足而无法将有上拉电阻的脚位往下拉。


常见问答 / 如何计算完成一次ADC转换所需要的时间?



ADC, CONVERSION RATE 如何计算完成一次ADC转换所需要的时间? 1586768727605 ADC完整的转换时间为取样时间与转换时间的和,计算公式如下所示: TADC = TSMP + Tconv 其中Tconv = 1.625us且取样时间的计算公式如下所示: ,且 FADCAQT= Fsys 由上式可得知,在Fsys = 16MHz的条件下: 由于ADC转换可设定为连续取样模式或中断模式,下面分别详述转换时间的计算方式: 1. 连续取样模式 通过计算可以得出ADC 转换率为500 ksps。 2. 中断模式 需加上ADC软启动与等待ADC flag举起的时间,以下图为例约为9个指令周期时间 故 通过计算可以得出ADC 转换率为390 ksps。


常见问答 / 内部参考电压选用可以大于操作电压吗?



Internal Reference Voltage 内部参考电压选用可以大于操作电压吗? 1582684920000 内部参考电压选用需依据操作电压,其值一定要小于或等于操作电压。举例来说,当操作电压为 2V 时,必需经由 VRFSEL[2:0] 将内部参考电压选择为 1.538V。


I15102FYI



I15102FYI 数字 ChipCorder® 具有数字压缩、全面的内存管理和集成的模拟/数字音频信号路径。消息管理功能旨在简化消息记录和地址自由,并使仅回放应用程序的代码开发更容易。 I15102FYI 利用闪存为双芯片解决方案提供非易失性音频记录/回放。I15102FYI 提供了 I2S 数字音频接口、更快的数字录制、更高的采样频率以及相当于12位分辨率的信噪比信号路径。 目标应用: • 家用电器-音频回馈 • 车用人机界面 • 安防报警系统 - 火灾,烟雾,一氧化碳探测器 • 医疗监护仪 - 音频回馈,语音提示 • 游戏机-声音提示 主要特点: • 储存空间/音讯长度 - 2分钟 以 8KHz/4bit ADPCM 计算,内置 4Mbit 快闪记忆体 • 音频管理 - Voice Prompts - 存储预先录制的音频 - Voice Macros - 执行预编程的宏程序 • 采样频率 - 7个采样频率 4 / 5.3 / 6.4 / 8 / 12.8 / 16 / 32 KHz • 音频输出 - PWM:D类扬声器驱动器,用于直接驱动 8Ω 扬声器或蜂鸣器 - 400mW@3V - 1W@5V • 输入输出接口 - 1組 SPI 接口 - 6路 GPIO 与 SPI 接口复用 • 工作特性 - 电压范围: 2.7V ~ 3.6V - 温度范围: -40°C ~ 85°C • 封装 - LQFP-48 (7x7mm) I15102FYI


研讨会 / Embedded World 2021 forum: Nuvoton Automotive MCU



SalesSupport@nuvoton.com Embedded World 2021 forum: Nuvoton Automotive MCU Nuvoton SalesSupport@nuvoton.com SalesSupport@nuvoton.com Two brand new products are released: Nuvoton's first automotive microcontroller, NuMicro NUC131SD2AEU with AEC-Q100 grade 2 qualified NuMicro M0A23 series with up to 125℃ operating temperature Join us and talk to our product manager for related inquiries! Register Now: https://zoom.us/webinar/register/WN__2ahJpZdQz-_jXAj_eCt2w SalesSupport@nuvoton.com


研讨会 / Is a smart meter equal to a secure meter?



SalesSupport@nuvoton.com Is a smart meter equal to a secure meter? Nuvoton SalesSupport@nuvoton.com SalesSupport@nuvoton.com Debriefing of M2354 enhanced MCU security features for Smart Meter applications. You will learn the infrastructure solution, AMI 2.0 smart meter, benefitting from the IoT security microcontroller. The brand new NuMicro M2354 IoT Security microcontroller series inherits the security features of the M2351 that have been Arm PSA Certified™ Level 1, Level 2, and PSA Functional API Certified, M2354 Series endows the microcontrollers used by network-connected devices with the physical level (chip-level) security protection function. It ensures the software and hardware integration system products developed can meet information and communication security requirements for the international mainstream standards. It can also simplify the implementation of regulations-compliant products that require security certification.


研讨会 / 【The best MCU beginner course】a real Nuvoton rookie will lead your way to the Nuvoton development platform



SalesSupport@nuvoton.com 【The best MCU beginner course】a real Nuvoton rookie will lead your way to the Nuvoton development platform Nuvoton SalesSupport@nuvoton.com SalesSupport@nuvoton.com Always want to knock on the door and get in the MCU world? Here is a perfect entrance for you! To let anyone interested in MCU familiar with Nuvoton’s development environment, we provide you a beginner course. Thus, you can have not only a whole picture of Nuvoton’s Development platform, including EVB, debugger/programmer, IDE, BSP, and software, but can also implement a very first project in this workshop. Nuvoton has a user-friendly environment even for beginners, so don’t hesitate to join us. Let Novoton’s rookie lead your way! Before we get started, please follow the steps before the workshop. 1. Terminal Emulator Download PuTTY:An open-source SSH and telnet client for the Windows platform. Download – "putty.exe" 2. IDE Installation - KEIL MDK Nuvoton edition M0 / M23


研讨会 / Nuvoton will be joining RT-Thread IoT OS Global Tech Conference



SalesSupport@nuvoton.com Nuvoton will be joining RT-Thread IoT OS Global Tech Conference Nuvoton SalesSupport@nuvoton.com SalesSupport@nuvoton.com GMT+1 The virtual conference will feature 29 trending topics, starting from June 1 to June 3. Nuvoton will be sharing the topic of "unleashing the RT-Thread IoT OS power by NuMicro M2354 series" on 6/2. Free Register: http://bit.ly/3GNujSQ SalesSupport@nuvoton.com