 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
DOC7707 датащи(PDF) 26 Page - List of Unclassifed Manufacturers |
|
|
|||||||||||||||||||||||||||||
DOC7707 датащи(HTML) 26 Page - List of Unclassifed Manufacturers |
|
|
26 / 307 page  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 |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
