外文资料翻译--基于c51兼容微处理器单片机的pwm控制器设计-单片机(编辑修改稿)

外文资料翻译--基于c51兼容微处理器单片机的pwm控制器设计-单片机(编辑修改稿)内容摘要：

operate instructions to control I/O pins for generating PWM output signals, so that CPU can not do anything other. Therefore, the method also has been discarded gradually. (3) Generated by ASIC. The ASIC makes a decrease of CPU burden and steady work generally has several functions such as overcurrent protection, deadtime adjustment and so on. Then the method has been widely used in many kinds of occasion now. (4) Generated by PWM function module of MCU. Through embedding PWM function module in MCU and initializing the function, PWM pins of MCU can also automatically generate PWM out signals without CPU controlling only when need to change dutycycle. It is the method that will be implemented in this paper. In this paper, we propose a PWM module embedded in a 8051 microcontroller. The PWM module can support PWM pulse signals by initializing the control register and dutycycle register with three methods just mentioned above to adjust the duty cycle and several operation modes to add flexibility for user. The following section explains the architecture of the PWM module and the architectures of basic functional blocks. Section3 describes two operation modes. Experimental and simulation results verifying proper system operation are also shown in that section. Depending on mode of operation, the PWM module creates one or more pulsewidth modulated signals, whose duty ratios can be independently adjusted. Implementation of PWM module in MCU Overview of the PWM module A block diagram of PWM module is shown in . It is clearly from the diagram that the whole module is posed of two sections: PWM signal generator and deadtime generator with channel select logic. The PWM function can be started by the user through implementing some instructions for initializing the PWM module. In particular, the following power and motion control applications are supported: • DC Motor • Uninterruptablel Power Supply (UPS) The PWM module also has the following features: • Two PWM signal outputs with plementary or independent operation • Hardware deadtime generators for plementary mode • Duty cycle updates are configurable to be immediated or synchronized to the PWM Architecture of PWM Module Details of the architecture PMW generator The architecture of the 2output PWM generator shown in is based on a 16bit resolution counter which creates a pulsewidth modulated signal. The system is synthesized by a system clock signal whose frequency can be。