High Speed Output Mode In this mode the CEX output (on port 1) associated wit" />
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  • 參數(shù)資料
    型號: T89C51AC2-SLSIM
    廠商: Atmel
    文件頁數(shù): 99/121頁
    文件大?。?/td> 0K
    描述: IC 8051 MCU FLASH 32K 44PLCC
    標(biāo)準(zhǔn)包裝: 27
    系列: 89C
    核心處理器: 8051
    芯體尺寸: 8-位
    速度: 40MHz
    連通性: UART/USART
    外圍設(shè)備: POR,PWM,WDT
    輸入/輸出數(shù): 34
    程序存儲器容量: 32KB(32K x 8)
    程序存儲器類型: 閃存
    EEPROM 大小: 2K x 8
    RAM 容量: 1.25K x 8
    電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-LCC(J 形引線)
    包裝: 管件
    79
    A/T89C51AC2
    4127H–8051–02/08
    High Speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle
    each time a match occurs between the PCA counter and the module’s capture registers.
    To activate this mode the TOG, MAT, and ECOM bits in the module’s CCAPMn SFR
    must be set.
    Figure 43. PCA High Speed Output Mode
    Pulse Width Modulator
    Mode
    All the PCA modules can be used as PWM outputs. The output frequency depends on
    the source for the PCA timer. All the modules will have the same output frequency
    because they all share the PCA timer. The duty cycle of each module is independently
    variable using the module’s capture register CCAPLn. When the value of the PCA CL
    SFR is less than the value in the module’s CCAPLn SFR the output will be low, when it
    is equal to or greater than it, the output will be high. When CL overflows from FF to 00,
    CCAPLn is reloaded with the value in CCAPHn. the allows the PWM to be updated with-
    out glitches. The PWM and ECOM bits in the module’s CCAPMn register must be set to
    enable the PWM mode.
    CH
    CL
    CCAPnH
    CCAPnL
    ECOMn
    CCAPMn, n = 0 to 4
    0xDA to 0xDE
    CAPNn MATn TOGn PWMn ECCFn
    CAPPn
    16-bit comparator
    Match
    CF
    CR
    CCON
    0xD8
    CCF4 CCF3 CCF2 CCF1 CCF0
    PCA IT
    Enable
    CEXn
    PCA counter/timer
    “1”
    “0”
    Write to
    CCAPnL
    Reset
    Write to
    CCAPnH
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