参数资料
型号: TSC80C31-20CHR
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44
封装: LCC-44
文件页数: 55/143页
文件大小: 4602K
代理商: TSC80C31-20CHR
19
XMEGA A3BU [DATASHEET]
8362F–AVR–02/2013
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.
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
DI
V
3
2
32kHz
Int. ULP
32.768kHz
Int. OSC
32.768kHz
TOSC
2MHz
Int. Osc
32MHz
Int. Osc
0.4 – 16MHz
XTAL
DI
V4
XOSCSEL
PLL
USBSRC
TO
S
C
1
TO
S
C
2
XT
AL1
XT
AL2
clkSYS
clkRTC
clkPER2
clkPER
clkCPU
clkPER4
clkUSB
DI
V
3
2
DI
V102
4
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