• 參數(shù)資料
    型號: ATMEGA644A-AUR
    廠商: Atmel
    文件頁數(shù): 136/160頁
    文件大?。?/td> 0K
    描述: IC MCU AVR 64K FLASH 44TQFP
    產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
    megaAVR Introduction
    標(biāo)準(zhǔn)包裝: 2,000
    系列: AVR® ATmega
    核心處理器: AVR
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,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: 64KB(32K x 16)
    程序存儲器類型: 閃存
    EEPROM 大?。?/td> 2K x 8
    RAM 容量: 4K x 8
    電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-TQFP
    包裝: 帶卷 (TR)
    其它名稱: ATMEGA644A-AUR-ND
    ATMEGA644A-AURTR
    77
    8272E–AVR–04/2013
    ATmega164A/PA/324A/PA/644A/PA/1284/P
    14.2.6
    Unconnected Pins
    If some pins are unused, it is recommended to ensure that these pins have a defined level. Even
    though most of the digital inputs are disabled in the deep sleep modes as described above, float-
    ing inputs should be avoided to reduce current consumption in all other modes where the digital
    inputs are enabled (Reset, Active mode, and Idle mode).
    The simplest method to ensure a defined level of an unused pin, is to enable the internal pull-up.
    In this case, the pull-up will be disabled during reset. If low power consumption during reset is
    important, it is recommended to use an external pull-up or pull-down. Connecting unused pins
    directly to V
    CC or GND is not recommended, since this may cause excessive currents if the pin is
    accidentally configured as an output.
    14.3
    Alternate Port Functions
    Most port pins have alternate functions in addition to being general digital I/Os. Figure 14-5
    shows how the port pin control signals from the simplified Figure 14-2 on page 73 can be over-
    ridden by alternate functions. The overriding signals may not be present in all port pins, but the
    figure serves as a generic description applicable to all port pins in the AVR microcontroller
    family.
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    ATMEGA644A-MU 功能描述:8位微控制器 -MCU 20 MHz Ind Temp 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
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