 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATMEGA1281 Datasheet(PDF) 39 Page - ATMEL Corporation |
|
||||||||||||||||||||||||||||||
ATMEGA1281 Datasheet(HTML) 39 Page - ATMEL Corporation |
|
|
39 / 407 page  39 ATmega640/1280/1281/2560/2561 2549A–AVR–03/05 System Clock and Clock Options Clock Systems and their Distribution Figure 21 presents the principal clock systems in the AVR and their distribution. All of the clocks need not be active at a given time. In order to reduce power consumption, the clocks to modules not being used can be halted by using different sleep modes, as described in “Power Management and Sleep Modes” on page 51. The clock systems are detailed below. Figure 21. Clock Distribution CPU Clock – clk CPU The CPU clock is routed to parts of the system concerned with operation of the AVR core. Examples of such modules are the General Purpose Register File, the Status Reg- ister and the data memory holding the Stack Pointer. Halting the CPU clock inhibits the core from performing general operations and calculations. I/O Clock – clk I/O The I/O clock is used by the majority of the I/O modules, like Timer/Counters, SPI, and USART. The I/O clock is also used by the External Interrupt module, but note that some external interrupts are detected by asynchronous logic, allowing such interrupts to be detected even if the I/O clock is halted. Also note that start condition detection in the USI module is carried out asynchronously when clk I/O is halted, TWI address recognition in all sleep modes. Flash Clock – clk FLASH The Flash clock controls operation of the Flash interface. The Flash clock is usually active simultaneously with the CPU clock. General I/O Modules Asynchronous Timer/Counter CPU Core RAM clk I/O clk ASY AVR Clock Control Unit clk CPU Flash and EEPROM clk FLASH Source clock Watchdog Timer Watchdog Oscillator Reset Logic Clock Multiplexer Watchdog clock Calibrated RC Oscillator Timer/Counter Oscillator Crystal Oscillator Low-frequency Crystal Oscillator External Clock ADC clk ADC System Clock Prescaler |
Similar Part No. - ATMEGA1281 |
|
Similar Description - ATMEGA1281 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
