參數(shù)資料
型號： AT90USB647-MUR
廠商： Atmel
文件頁數(shù)： 66/106頁
文件大?。?/td> 0K
描述： MCU AVR 64K FLASH 16MHZ 64QFN
產(chǎn)品培訓模塊： MCU Product Line Introduction
megaAVR Introduction
標準包裝： 1
系列： AVR® 90USB
核心處理器： AVR
芯體尺寸： 8-位
速度： 16MHz
連通性： EBI/EMI，I²C，SPI，UART/USART，USB，USB OTG
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 48
程序存儲器容量： 64KB（64K x 8）
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)： 2.7 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： 64-VFQFN 裸露焊盤
包裝： 剪切帶 (CT)
其它名稱： AT90USB647-MURCT
62
7593L–AVR–09/12
AT90USB64/128
Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and then
Reset the MCUSR as early as possible in the program. If the register is cleared before another
reset occurs, the source of the reset can be found by examining the Reset Flags.
9.7
Internal voltage reference
Atmel AT90USB64/128 features an internal bandgap reference. This reference is used for
Brown-out Detection, and it can be used as an input to the Analog Comparator or the ADC.
9.7.1
Voltage reference enable signals and start-up time
The voltage reference has a start-up time that may influence the way it should be used. The
start-up time is given in Table 9-4. To save power, the reference is not always turned on. The
reference is on during the following situations:
1.
When the BOD is enabled (by programming the BODLEVEL [2..0] Fuse).
2.
When the bandgap reference is connected to the Analog Comparator (by setting the
ACBG bit in ACSR).
3.
When the ADC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user
must always allow the reference to start up before the output from the Analog Comparator or
ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three
conditions above to ensure that the reference is turned off before entering Power-down mode.
Table 9-4.
Internal voltage reference characteristics.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
VBG
Bandgap reference voltage
1.0
1.1
1.2
V
tBG
Bandgap reference start-up time
40
70
s
IBG
Bandgap reference current
consumption
10
A
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