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參數(shù)資料
| 型號： | MPG5374X |
| 元件分類： | LED |
| 英文描述： | T-1 3/4 SINGLE COLOR LED, GREEN, 5 mm |
| 封裝： | ROHS COMPLIANT PACKAGE-2 |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 413K |
| 代理商： | MPG5374X |
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19
XMEGA C3 [DATASHEET]
8361D–AVR–07/2013
Figure 10-1. The clock system, clock sources and clock distribution.
10.3 Clock Sources
The clock sources are divided in two main groups: internal oscillators and external clock sources. Most of the clock
sources can be directly enabled and disabled from software, while others are automatically enabled or disabled,
depending on peripheral settings. After reset, the device starts up running from the 2MHz internal oscillator. The other
clock sources, DFLLs and PLL, are turned off by default.
The internal oscillators do not require any external components to run. For details on characteristics and accuracy of the
internal oscillators, refer to the device datasheet.
10.3.1 32kHz Ultra Low Power Internal Oscillator
This oscillator provides an approximate 32kHz clock. The 32kHz ultra low power (ULP) internal oscillator is a very low
power clock source, and it is not designed for high accuracy. The oscillator employs a built-in prescaler that provides a
Real Time
Counter
Peripherals
RAM
AVR CPU
Non-Volatile
Memory
Watchdog
Timer
Brown-out
Detector
System Clock Prescalers
USB
Prescaler
System Clock Multiplexer
(SCLKSEL)
PLLSRC
RTCSRC
DIV
3
2
32kHz
Int. ULP
32.768kHz
Int. OSC
32.768kHz
TOSC
2MHz
Int. Osc
32MHz
Int. Osc
0.4 – 16MHz
XTAL
DIV
3
2
DIV
3
2
DI
V4
XOSCSEL
PLL
USBSRC
TO
S
C
1
TO
S
C
2
XTAL1
XTAL2
clkSYS
clkRTC
clkPER2
clkPER
clkCPU
clkPER4
clkUSB
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