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    參數(shù)資料
    

    


    


    
型號(hào)：
ST62E01CD3

    

    
英文描述：
MICROCONTROLLER|8-BIT|ST6200 CPU|CMOS|DIP|16PIN|CERAMIC

    

    
中文描述：
單片機(jī)| 8位| ST6200的CPU |的CMOS |雙酯| 16PIN |陶瓷

    

    
文件頁(yè)數(shù)：
52/82頁(yè)

    

    
文件大?。?/td>
870K

    

    
代理商：
ST62E01CD3


    

    

    

	
    
    
    

    
    
	
    52/82
    ST62T18C/E18C
    A/D CONVERTER
     (Cont’d)
    Since the ADC is on the same chip as the micro-
    processor, the user should not switch heavily load-
    ed output signals during conversion, if high preci-
    sion is required. Such switching will affect the sup-
    ply voltages used as analog references.
    The accuracy of the conversion depends on the
    quality of the power supplies (V
    DD
     and V
    SS
    ). The
    user must take special care to ensure a well regu-
    lated reference voltage is present on the V
    DD
     and
    V
    SS
     pins (power supply voltage variations must be
    less than 5V/ms). This implies, in particular, that a
    suitable decoupling capacitor is used at the V
    DD
    pin.
    The converter resolution is given by:
    V
    –
    256
    The Input voltage (Ain) which is to be converted
    must be constant for 1μs before conversion and
    remain constant during conversion.
    Conversion resolution can be improved if the pow-
    er supply voltage (V
    DD
    ) to the microcontroller is
    lowered.
    In order to optimise conversion resolution, the user
    can configure the microcontroller in WAIT mode,
    because this mode minimises noise disturbances
    and power supply variations due to output switch-
    ing. Nevertheless, the WAIT instruction should be
    executed as soon as possible after the beginning
    of the conversion, because execution of the WAIT
    instruction may cause a small variation of the V
    DD
    voltage. The negative effect of this variation is min-
    imized at the beginning of the conversion when the
    converter is less sensitive, rather than at the end
    of conversion, when the less significant bits are
    determined.
    The best configuration, from an accuracy stand-
    point, is WAIT mode with the Timer stopped. In-
    deed, only the ADC peripheral and the oscillator
    are then still working. The MCU must be woken up
    from WAIT mode by the ADC interrupt at the end
    of the conversion. It should be noted that waking
    up the microcontroller could also be done using
    the Timer interrupt, but in this case the Timer will
    be working and the resulting noise could affect
    conversion accuracy.
    One extra feature is available in the ADC to get a
    better accuracy. In fact, each ADC conversion has
    to be followed by a WAIT instruction to minimize
    the noise during the conversion. But the first con-
    version step is performed before the execution of
    the WAIT when most of clocks signals are still en-
    abled . The key is to synchronize the ADC start
    with the effective execution of the WAIT. This is
    achieved by setting ADC SYNC option. This way,
    ADC conversion starts in effective WAIT for maxi-
    mum accuracy.
    Note: With this extra option, it is mandatory to ex-
    ecute WAIT instruction just after ADC start instruc-
    tion. Insertion of any extra instruction may cause
    spurious interrupt request at ADC interrupt vector.
    A/D Converter Control Register (ADCR)
    Address: 0D1h
    —
    Read/Write
    Bit 7 = 
    EAI
    : 
    Enable A/D Interrupt.
    If this bit is set to
    “1” the A/D interrupt is enabled, when EAI=0 the
    interrupt is disabled.
    Bit 6 = 
    EOC
    : 
    End of conversion.
    Read Only
    . This
    read only bit indicates when a conversion has
    been completed. This bit is automatically reset to
    “0” when the STA bit is written. If the user is using
    the interrupt option then this bit can be used as an
    interrupt pending bit. Data in the data conversion
    register are valid only when this bit is set to “1”.
    Bit 5 = 
    STA
    : Start of Conversion. Write Only
    . Writ-
    ing a “1” to this bit will start a conversion on the se-
    lected channel and automatically reset to “0” the
    EOC bit. If the bit is set again when a conversion is
    in progress, the present conversion is stopped and
    a new one will take place. This bit is write only, any
    attempt to read it will show a logical zero.
    Bit 4 = 
    PDS
    : Power Down Selection.
     This bit acti-
    vates the A/D converter if set to “1”. Writing a “0” to
    this bit will put the ADC in power down mode (idle
    mode).
    Bit 3= 
    CLSEL
    : 
    Clock Selection
    . When set, the
    ADC is driven by the MCU internal clock divided by
    6, and typical conversion time at 8MHz is 35μs.
    When cleared (Reset state), MCU clock divided by
    12 is used with a typical 70μs conversion time at
    8MHz. 
    Bit 2 = 
    OSCOFF
    . When low, this bit enables main
    oscillator to run. The main oscillator is switched off
    when OSCOFF is high.
    Bit 1-0: Reserved. Must be kept cleared.
    A/D Converter Data Register (ADR)
    Address: 0D0h
    —
    Read only
    Bit 7-0 = 
    D7-D0
    : 8 Bit A/D Conversion Result.
    SS
    -----------------V
    7
    0
    EAI
    EOC
    STA
    PDS
    CLSEL
    OSC 
    OFF
    D1
    D0
    7
    0
    D7
    D6
    D5
    D4
    D3
    D2
    D1
    D0
    52
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
ST62E18CF1
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    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
ST62E01CD3/CCC
 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Microcontroller

    

    
ST62E01CD6
 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller

    

    
ST62E01CD6/CCC
 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Microcontroller

    

    
ST62E01CF1
功能描述:8位微控制器 -MCU UV EPROM 2K No Intrf

 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT

    

    
ST62E01F1/HWD
 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller

    

    
    
    
    
	
    	
    
    
     
     
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