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以低功耗微控制器P89LV51RD2为控制核心,频率合成部分采用压控振荡器和锁相环相结合的结构,既可以实现宽频率调节范围和高输出频率,又可以保证输出频率的稳定性和精确度。提出了一种高效的键盘扫描和键值处理方法,仅用四个按键完成了系统的所有输入功能,且占用系统资源少。LCD实时显示设定频率和实测频率;此外,系统还整合了USB在线下载单元,便于软件升级。最后测试各项指标达到了设计要求。
Low-power microcontroller P89LV51RD2 as the control center, the frequency synthesis part of the combination of voltage-controlled oscillator and phase-locked loop, both to achieve a wide range of frequency adjustment and high output frequency, but also to ensure the stability of the output frequency and Accuracy. An efficient method of keyboard scanning and key-value processing is proposed. All the input functions of the system are completed with only four keys, and the system resources are few. LCD real-time display set frequency and measured frequency; In addition, the system also integrates the USB online download unit, easy software upgrades. The final test of the indicators to meet the design requirements.