參數資料
型號: R5F2L36CCNFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數: 16/74頁
文件大?。?/td> 959K
代理商: R5F2L36CCNFP
24
2588F–AVR–06/2013
ATtiny261/461/861
6.
Clock System
Figure 6-1 presents the principal clock systems and their distribution in ATtiny261/461/861. 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
Figure 6-1.
Clock Distribution
6.1
Clock Subsystems
The clock subsystems are detailed in the sections below.
6.1.1
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.
6.1.2
I/O Clock – clk
I/O
The I/O clock is used by the majority of the I/O modules, like Timer/Counter. 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.
General I/O
Modules
CPU Core
RAM
clk
I/O
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
Calibrated RC
Oscillator
ADC
clk
ADC
Crystal
Oscillator
Low-Frequency
Crystal Oscillator
System Clock
Prescaler
PLL
Oscillator
clk
PCK
General I/O
Modules
External Clock
clk
PLL
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