| 3种基于HCS12定时器的PWM波形发生器的设计 |
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| 引用本文： | 冯道宁,刘昭度,叶阳.3种基于HCS12定时器的PWM波形发生器的设计[J].武汉理工大学学报,2012,34(2):140-143. |
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| 作者姓名： | 冯道宁 刘昭度 叶阳 |
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| 作者单位： | 1. 北京理工大学机械与车辆工程学院,北京100081;广西机电职业技术学院电气工程系,南宁530007
2. 北京理工大学机械与车辆工程学院,北京,100081 |
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| 基金项目： | 国家“十一五”预研项目(40401040302) |
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| 摘 要： | 在车辆ASR系统开发中,提出了基于HCS12单片机增强型定时器复用I/O输出PWM信号的开发方案,解决了由于硬件限制导致PWM输出通道的不足的问题。介绍了单片机增强定时器通过输出比较寄存器、输出比较中断、TCNT输出翻转实现PWM波形输出的3种方法,详述了各方法中重要寄存器的设置和逻辑对应关系,并给出了相应的波形输出图和程序流程图,通过理论分析和实验结果探讨了不同设计方案的优缺点。
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| 关 键 词： | PWM 输出比较寄存器 占空比 TCNT |
Three Designs of PWM Generator Based on HCS12 Timer |
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| FENG Dao-ning
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LIU Zhao-du
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YE Yang.Three Designs of PWM Generator Based on HCS12 Timer[J].Journal of Wuhan University of Technology,2012,34(2):140-143. |
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| Authors: | FENG Dao-ning LIU Zhao-du YE Yang |
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| Affiliation: | 1(1.School of Mechanical and Vehicular Engineering,Beijing Institute of Technology,Beijing 100081,China; 2.Department of Electrical Engineering,Guangxi Vocational College of Mechanical & Electrical Technology, Nanning 530007,China) |
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| Abstract: | The development of multiplex I/O output PWM waveform based on enhanced capture timer module of HSC12 single-chip is proposed in vehicle ASR system,to solves PWM output channels shortage due to hardware limitation led to the problem.Three approaches taken in the investigation is called output-compare register,interrupt caused by output-compare and TCNT output flip.Details of the methods set the single-chip registers and logical corresponding relation is introduced,the waveform output map and the procedure-flow chart is given.The character of different designs is proposed and the limitation is researched according to theory analysis the experimental results. |
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| Keywords: | PWM output-compare register duty TCNT |
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