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ATMEGA8-16PU Fiches technique(PDF) 25 Page - ATMEL Corporation

No de pièce ATMEGA8-16PU
Description  8-bit with 8K Bytes In-System Programmable Flash
Download  308 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8-16PU Fiches technique(HTML) 25 Page - ATMEL Corporation

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25
2486T–AVR–05/08
ATmega8(L)
System Clock
and Clock
Options
Clock Systems
and their
Distribution
Figure 10 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 Manage-
ment and Sleep Modes” on page 33. The clock systems are detailed Figure 10.
Figure 10. 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 Register 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 inter-
rupts are detected by asynchronous logic, allowing such interrupts to be detected even if the I/O
clock is halted. Also note that address recognition in the TWI module is carried out asynchro-
nously when clk
I/O is halted, enabling TWI address reception in all sleep modes.
Flash Clock – clk
FLASH
The Flash clock controls operation of the Flash interface. The Flash clock is usually active simul-
taneously with the CPU clock.
General I/O
Modules
Asynchronous
Timer/Counter
ADC
CPU Core
RAM
clk
I/O
clk
ASY
AVR Clock
Control Unit
clk
CPU
Flash and
EEPROM
clk
FLASH
clk
ADC
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 RC
Oscillator
External Clock


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