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參數(shù)資料
| 型號： | ATF16V8B-10SI |
| 廠商： | Atmel |
| 文件頁數(shù)： | 19/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PLD EE 10NS 20-SOIC |
| 標準包裝： | 37 |
| 系列： | 16V8 |
| 可編程類型： | EE PLD |
| 宏單元數(shù)： | 8 |
| 輸入電壓： | 5V |
| 速度： | 10ns |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC W |
| 包裝： | 管件 |
| 其它名稱： | ATF16V8B10SI |
26
7707F–AVR–11/10
AT90USB82/162
6.1.4
USB Clock – clk
USB
The USB is provided with a dedicated clock domain. This clock is generated with an on-chip PLL
running at 48MHz. The PLL always multiply its input frequency by 6. Thus the PLL clock register
should be programmed by software to generate a 8MHz clock on the PLL input.
6.2
Clock Switch
In the AT90USB82/162 product, the Clock Multiplexer and the System Clock Prescaler can be
modified by software.
6.2.1
Exemple of use
The modification can occur when the device enters in USB Suspend mode. It then switches from
External Clock to Calibrated RC Oscillator in order to reduce consumption. In such a configura-
tion, the External Clock is disabled.
The firmware can use the watchdog timer to be woken-up from power-down in order to check if
there is an event on the application.
If an event occurs on the application or if the USB controller signals a non-idle state on the USB
line (Resume for example), the firmware switches the Clock Multiplexer from the Calibrated RC
Oscillator to the External Clock.
Figure 6-2.
Example of clock switching with wake-up from USB Host
USB
CPU Clock
External
Oscillator
RC oscillator
Ext
RC
Ext
non-Idle
Idle
(Suspend)
non-Idle
3m
s
resume
1
1 Resume from Host
watchdog wake-up
from power-down
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相關代理商/技術參數(shù) |
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| ATF16V8B-10XC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Highperformance EE PLD |
| ATF16V8B-10XI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
| ATF16V8B-15GC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
| ATF16V8B-15GI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
| ATF16V8B-15GM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
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