參數(shù)資料
型號(hào): CX24118A-12Z
廠商: NXP SEMICONDUCTORS
元件分類(lèi): 消費(fèi)家電
英文描述: Advanced Modulation Digital Satellite Tuner
中文描述: SPECIALTY CONSUMER CIRCUIT, PQCC36
封裝: 6 X 6 MM, 0.85 MM HEIGHT, PLASTIC, SOT1092-1, HVQFN-36
文件頁(yè)數(shù): 11/45頁(yè)
文件大小: 494K
代理商: CX24118A-12Z
19
XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
10.
System Clock and Clock options
10.1
Features
Fast start-up time
Safe run-time clock switching
Internal oscillators:
32MHz run-time calibrated and tunable oscillator
2MHz run-time calibrated oscillator
32.768kHz calibrated oscillator
32kHz ultra low power (ULP) oscillator with 1kHz output
External clock options
0.4MHz - 16MHz crystal oscillator
32.768kHz crystal oscillator
External clock
PLL with 20MHz - 128MHz output frequency
Internal and external clock options and 1x to 31x multiplication
Lock detector
Clock prescalers with 1x to 2048x division
Fast peripheral clocks running at two and four times the CPU clock
Automatic run-time calibration of internal oscillators
External oscillator and PLL lock failure detection with optional non-maskable interrupt
10.2
Overview
Atmel AVR XMEGA devices have a flexible clock system supporting a large number of clock sources. It incorporates
both accurate internal oscillators and external crystal oscillator and resonator support. A high-frequency phase locked
loop (PLL) and clock prescalers can be used to generate a wide range of clock frequencies. A calibration feature (DFLL)
is available, and can be used for automatic run-time calibration of the internal oscillators to remove frequency drift over
voltage and temperature. An oscillator failure monitor can be enabled to issue a non-maskable interrupt and switch to the
internal oscillator if the external oscillator or PLL fails.
When a reset occurs, all clock sources except the 32kHz ultra low power oscillator are disabled. After reset, the device
will always start up running from the 2MHz internal oscillator. During normal operation, the system clock source and
prescalers can be changed from software at any time.
Figure 10-1 on page 20 presents the principal clock system in the XMEGA A1U family devices. Not all of the clocks need
to be active at a given time. The clocks for the CPU and peripherals can be stopped using sleep modes and power
reduction registers as described in “Power Management and Sleep Modes” on page 22.
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