参数资料
型号: TSC87C51-L16IEB
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP44
封装: 1.40 MM HEIGHT, VQFP-44
文件页数: 93/176页
文件大小: 2962K
代理商: TSC87C51-L16IEB
23
2535J–AVR–08/10
ATtiny13
6. System Clock and Clock Options
6.1
Clock Systems and their Distribution
Figure 6-1 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 30. The clock systems are detailed below.
Figure 6-1.
Clock Distribution
6.1.1
CPU Clock – clkCPU
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 – clkI/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.
6.1.3
Flash Clock – clkFLASH
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
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
External Clock
ADC
clk
ADC
相关PDF资料
PDF描述
TSC87C51-20CBR 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44
TSC87C51-25CIB 8-BIT, OTPROM, 25 MHz, MICROCONTROLLER, CQCC44
TSC87C51-33CBB 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC44
TSC87C52-33CDB 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP44
T89C51RD2-3CVCM 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
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