參數(shù)資料
    

    


    


    
型號(hào)：
M38278E2MXXXFS

    

    
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)：
34/70頁(yè)

    

    
文件大小：
1112K

    

    
代理商：
M38278E2MXXXFS


    

    

    

	
    
    
    

    
    
	
    34
    SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    3827 Group
    MITSUBISHI MICROCOMPUTERS
    D-A CONVERTER
    The 3827 group has an on-chip D-A converter with 8-bit resolution
    and 2 channels (DAi (i=1, 2)). The D-A converter is performed by
    setting the value in the D-A conversion register. The result of D-A
    converter is output from DAi pin. When using the D-A converter,
    the corresponding port direction register bit (P5
    6
    /DA
    1
    , P5
    7
    /DA
    2
    )
    should be set to “0” (input status).
    The output analog voltage V is determined by the value n (base
    10) in the D-A conversion register as follows:
    V=V
    REF
     n/256 (n=0 to 255)
    Where V
    REF
     is the reference voltage.
    At reset, the D-A conversion registers are cleared to “00
    16
    ”, the
    DAi output enable bits are cleared to “0”, and DAi pin goes to
    high impedance state. The DA output is not buffered, so connect
    an external buffer when driving a low-impedance load.
    Fig. 35  Structure of D-A control register
    Fig. 36  Block diagram of D-A converter
    Fig. 37  A-D converter, D-A converter block diagram
    DA
    1
     output enable bit/DA
    1
     V
    REF
    ON/OFF switch
    DA
    2
     output enable bit/DA
    2
     V
    REF
    ON/OFF switch
    Not used (return “0” when read)
    0 : Output disabled/OFF
    1 : Output enabled/ON
    b7
    b0
    D-A control register
    (DACON : address 0036
     16
    )
    D-A1 conversion register (0034
     16
    )
    D-A2 conversion register (0035
     16
    )
    P5
    6
    /DA
    1
    P5
    7
    /DA
    2
    Data bus
    D-A i conversion register (8)
    R-2R resistor ladder
    DA i output enable bit
    V
    REF
    Resistor ladder
    A-D conversion register
    (10 bits)
    D-A1 conversion register (8 bits)
    D-A2 conversion register (8 bits)
    R-2R resistor ladder
    R-2R resistor ladder
    D-A2 output
    D-A1 output
    (P5
    6
    )
    (P5
    7
    )
    D-A2 output enable switch
    D-A2 V
    REF
     ON/OFF switch
    D-A1 output enable switch
    D-A1 V
    REF
     ON/OFF switch
    V
    REF
     input 
    ON/OFF switch
    Internal: D-A output
    External: V
    REF
    Reference voltage input select switch
    
    
    
    
    
    


    


    

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