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    參數(shù)資料
    型號: AT90S8515-8AC
    廠商: Atmel
    文件頁數(shù): 30/112頁
    文件大?。?/td> 0K
    描述: IC MCU 8K FLSH 8MHZ 44TQFP
    標(biāo)準(zhǔn)包裝: 160
    系列: AVR® 90S
    核心處理器: AVR
    芯體尺寸: 8-位
    速度: 8MHz
    連通性: SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 32
    程序存儲器容量: 8KB(4K x 16)
    程序存儲器類型: 閃存
    EEPROM 大?。?/td> 512 x 8
    RAM 容量: 512 x 8
    電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
    振蕩器型: 內(nèi)部
    工作溫度: 0°C ~ 70°C
    封裝/外殼: 44-TQFP
    包裝: 托盤
    24
    AT90S8515
    0841G–09/01
    The user can select the start-up time according to typical oscillator start-up. The number
    of WDT oscillator cycles used for each time-out is shown in Table 4. The frequency of
    the Watchdog Oscillator is voltage-dependent as shown in “Typical Characteristics” on
    Power-on Reset
    A Power-on Reset (POR) circuit ensures that the device is reset from power-on. As
    shown in Figure 23, an internal timer clocked from the Watchdog Timer oscillator pre-
    vents the MCU from starting until after a certain period after V
    CC has reached the Power-
    on Threshold Voltage (VPOT), regardless of the VCC rise time (see Figure 24). The
    FSTRT Fuse bit in the Flash can be programmed to give a shorter start-up time if a
    ceramic resonator or any other fast-start oscillator is used to clock the MCU.
    If the built-in start-up delay is sufficient, RESET can be connected to VCC directly or via
    an external pull-up resistor. By holding the pin low for a period after VCC has been
    applied, the Power-on Reset period can be extended. Refer to Figure 25 for a timing
    example of this.
    Figure 24. MCU Start-up, RESET Tied to VCC.
    Figure 25. MCU Start-up, RESET Controlled Externally
    Table 4. Number of Watchdog Oscillator Cycles
    FSTRT
    Time-out at V
    CC = 5V
    Number of WDT Cycles
    Programmed
    0.28 ms
    256
    Unprogrammed
    16.0 ms
    16K
    VCC
    RESET
    TIME-OUT
    INTERNAL
    RESET
    t
    TOUT
    V
    POT
    V
    RST
    VCC
    RESET
    TIME-OUT
    INTERNAL
    RESET
    t
    TOUT
    V
    POT
    V
    RST
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