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    參數(shù)資料
    型號(hào): TS87C58X2-LCE
    廠商: Atmel
    文件頁(yè)數(shù): 7/62頁(yè)
    文件大?。?/td> 0K
    描述: IC MCU 8BIT 32K OTP 30MHZ 44VQFP
    標(biāo)準(zhǔn)包裝: 160
    系列: 87C
    核心處理器: 8051
    芯體尺寸: 8-位
    速度: 30/20MHz
    連通性: UART/USART
    外圍設(shè)備: POR,WDT
    輸入/輸出數(shù): 32
    程序存儲(chǔ)器容量: 32KB(32K x 8)
    程序存儲(chǔ)器類型: OTP
    RAM 容量: 256 x 8
    電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
    振蕩器型: 內(nèi)部
    工作溫度: 0°C ~ 70°C
    封裝/外殼: 44-QFP
    包裝: 托盤(pán)
    15
    4431E–8051–04/06
    AT/TS8xC54/8X2
    Figure 8-1.
    Auto-Reload Mode Up/Down Counter (DCEN = 1)
    8.1.1
    Programmable Clock-Output
    In the clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock generator
    (See Figure 8-2) . The input clock increments TL2 at frequency F
    OSC/2. The timer repeatedly
    counts to overflow from a loaded value. At overflow, the contents of RCAP2H and RCAP2L reg-
    isters are loaded into TH2 and TL2. In this mode, timer 2 overflows do not generate interrupts.
    The formula gives the clock-out frequency as a function of the system oscillator frequency and
    the value in the RCAP2H and RCAP2L registers :
    For a 16 MHz system clock, timer 2 has a programmable frequency range of 61 Hz
    (F
    OSC/2
    16) to 4 MHz (F
    OSC/4). The generated clock signal is brought out to T2 pin (P1.0).
    Timer 2 is programmed for the clock-out mode as follows:
    Set T2OE bit in T2MOD register.
    Clear C/T2 bit in T2CON register.
    Determine the 16-bit reload value from the formula and enter it in RCAP2H/RCAP2L
    registers.
    (DOWN COUNTING RELOAD VALUE)
    C/T2
    TF2
    TR2
    T2
    EXF2
    TH2
    (8-bit)
    TL2
    (8-bit)
    RCAP2H
    (8-bit)
    RCAP2L
    (8-bit)
    FFh
    (8-bit)
    FFh
    (8-bit)
    T OG-
    (UP COUNTING RELOAD VALUE)
    TIMER 2
    INTERRUPT
    XTAL1
    :12
    F
    OSC
    FXTAL
    0
    1
    T2CONreg
    T2EX:
    if DCEN=1, 1=UP
    if DCEN=1, 0=DOWN
    (:6 in X2 mode)
    Clock OutFrequency
    Fosc
    4
    65536
    RCAP2H
    RCAP2L
    ()
    ×
    -----------------------------------------------------------------------------------------
    =
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