參數(shù)資料
        

        


        


        
型號(hào)：
M38278ECMXXXGP

        

        
廠商：
Mitsubishi Electric Corporation

        

        
英文描述：
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

        

        
中文描述：
單芯片8位CMOS微機(jī)

        

        
文件頁(yè)數(shù)：
31/70頁(yè)

        

        
文件大?。?/td>
1112K

        

        
代理商：
M38278ECMXXXGP


        

        

        

	
        
    
    

    
        
	
        31
        SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
        MITSUBISHI MICROCOMPUTERS
        3827 Group
        PULSE WIDTH MODULATION (PWM)
        The 3827 group has a PWM function with an 8-bit resolution,
        based on a signal that is the clock input X
        IN
         or that clock input di-
        vided by 2.
        Data Setting
        The PWM output pin also functions as ports P5
        0 
        and P5
        1
        . Set the
        PWM period by the PWM prescaler, and set the period during
        which the output pulse is an “H” by the PWM register.
        If PWM count source is f(X
        IN
        ) and the value in the PWM prescaler
        is n and the value in the PWM register is m (where n = 0 to 255
        and m = 0 to 255) :
        PWM period = 255 
         (n+1)/f(X
        IN
        )
        = 51 
         (n+1) 
        μ
        s (when X
        IN
         = 5 MHz)
        Output pulse “H” period = PWM period 
         m/255
        = 0.2 
         (n+1) 
         m 
        μ
        s
            (when X
        IN
         = 5 MHz)
        PWM Operation
        When at least either bit 1 (PWM
        0
         output enable bit) or bit 2 (PWM
        1
        output enable bit) of the PWM control register is set to “1”, opera-
        tion starts by initializing the PWM output circuit, and pulses are
        output starting at an “H”. When one PWM output is enabled and
        that the other PWM output is enabled, PWM output which is en-
        abled to output later starts pulse output from halfway.
        When the PWM register or PWM prescaler is updated during
        PWM output, the pulses will change in the cycle after the one in
        which the change was made.
        Fig. 29  Timing of PWM cycle
        Fig. 30  Block diagram of PWM function
        51 
         m 
         (n+1)
        255
        μ
        s
        T = [51  
         (n+1)] 
        μ
        s
        PWM output
        m: Contents of PWM register
        n : Contents of PWM prescaler
        T : PWM cycle (when f(X
        IN
        ) = 5 MHz)
        Data bus
        Count source 
        selection bit
        “0”
        “1”
        PWM 
        prescaler pre-latch
        PWM 
        register pre-latch
        PWM 
        prescaler latch
        PWM 
        register latch
        Transfer control circuit
        PWM circuit
        1/2
        X
        IN
        PWM
        0
         enable bit
        Port P5
        6 
        PWM prescaler
        PWM
        1
         enable bit
        
    
        
    
    
        


        


        

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