參數(shù)資料
    

    


    


    
型號(hào)：
P80CL580

    

    
廠商：
NXP Semiconductors N.V.

    

    
英文描述：
Low voltage 8-bit microcontrollers with UART, I2C-bus and ADC

    

    
中文描述：
低電壓8 - UART的，位微控制器的I2C總線和ADC

    

    
文件頁(yè)數(shù)：
36/80頁(yè)

    

    
文件大?。?/td>
366K

    

    
代理商：
P80CL580


    

    

    

	
    
    
    

    
    
	
    1997 Mar 14
    36
    Philips Semiconductors
    Product specification
    Low voltage 8-bit microcontrollers with
    UART, I
    2
    C-bus and ADC
    P80CL580; P83CL580
    16.3.2
    U
    SING
     T
    IMER
     2
     TO GENERATE BAUD RATES
    Timer 2 is selected as a Baud Rate Generator by setting
    the RTCLK bit in T2CON. The Baud Rate Generator mode
    is similar to the Auto-reload mode, in that a roll-over in TH2
    causes Timer 2 registers to be reloaded with the 16-bit
    value held in the registers RCAP2H and RCAP2L, which
    are preset by software. Baud rates in Modes 1 and 3 are
    determined by Timer 2's overflow rate as specified below.
    16
    The Timer 2 can be configured for either ‘timer’ or ‘counter’
    operation. In the most typical applications, it is configured
    for ‘timer’ operation (C/T2 = 0). ‘Timer’ operation is slightly
    different for Timer 2 when it is being used as a Baud Rate
    Generator. Normally, as a timer it would increment every
    machine cycle at a frequency of
    1
    12
    ×
     f
    osc
    . However, as a
    Baud Rate Generator it increments every state time at a
    frequency of
    1
    2
    ×
     f
    osc
    . In this case the baud rate in
    Modes 1 and 3 is determined as:
    Baud Rate
    Timer 2 Overflow Rate
    =
    Baud Rate
    f
    RCAP2H; RCAP2L
    32
    65536
    (
    )
    –
    {
    }
    ×
    ----------------------------------------------------------------------------------------------------
    =
    Where (RCAP2H; RCAP2L) is the content of registers
    RCAP2H and RCAP2L taken as a 16-bit unsigned integer.
    The Baud Rate Generator mode for Timer 2 is shown in
    Fig.18. This figure is only valid if RTCLK = 1. At roll-over
    TH2 does not set the TF2 bit in T2CON and therefore, will
    not generate an interrupt. Consequently, the Timer 2
    interrupt does not need to be disabled when in the Baud
    Rate Generator mode. If EXEN2 is set, a HIGH-to-LOW
    transition on T2EX will set the EXF2 bit, also in T2CON,
    but will not cause a reload from (RCAP2H; RCAP2L) to
    (TH2, TL2). Therefore, in this mode T2EX may be used as
    an additional external interrupt.
    When Timer 2 is operating as a timer (TR2 = 1), in the
    Baud Rate Generator mode, registers TH2 and TL2 should
    not be accessed (read or write). Under these conditions
    the timer is being incremented every state time and
    therefore the results of a read or write may not be
    accurate. The registers RCAP2H and RCAP2L however,
    may be read but not written to. A write might overlap a
    reload and cause write and/or reload errors. If a write
    operation is required, Timer 2 or RCAP2H/RCAP2L
    should first be turned off by clearing the TR2 bit.
    handbook, full pagewidth
    MGD622
    TL2
    (8 BITS)
    TR2 
    control
    TH2
    (8 BITS)
    RCAP2L
    RCAP2H
    EXF2
    EXEN2 
    control
    C/T2 = 0
    C/T2 = 1
    T2 PIN
    2
    OSC
    transition
    detector
    T2EX PIN
    TIMER 2 interrupt
    (additional external interrupt)
    (note: divided by 2
    not by 12)
    16
    RTCLK
    RELOAD
    CLK
    UART receive/
    transmit clock
    SMOD
    1
    0
    1
    0
    2
    TIMER 1
    overflow
    Fig.18  Timer 2 in Baud Rate Generator mode.
    
    
    
    
    
    


    


    

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    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
P80CL580HFB
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 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller

    

    
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P80CL580HFD-T
 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller

    

    
P80CL580HFH
 制造商:NXP Semiconductors 功能描述:

    

    
    
    
    
	
    	
    
    
     
     
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