AN663 查看數據表（PDF） - Silicon Laboratories

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AN663

PRECISION32 MCU FAMILY CLOCKING OPTIONS

Silicon Laboratories 

AN663

2.1. Low Power Oscillator (LPOSCn)

The low power oscillator is the default oscillator after reset. The default, factory-calibrated frequency of this

oscillator is 20 MHz, but a divide by 8 version is also available as an AHB clock source.

This oscillator starts very quickly and automatically turns on and off as needed. This oscillator consumes less

power than other oscillators, but may not be as accurate over voltage and temperature.

There are no configuration bits for this oscillator. Figure 2 shows the block diagram for the low power oscillator.

LPOSCn Module

Low Power

Oscillator

Divided LPOSCn Clock

LPOSCn Clock

Automatic Start/

Stop Control

Figure 2. Low Power Oscillator Block Diagram

2.2. Low Frequency Oscillator (LFOSCn)

The low frequency oscillator is part of the RTC module and can be selected as an RTC timer clock source in

addition to the AHB clock source. The factory-calibrated output frequency of this oscillator is 16.4 kHz.

This oscillator consumes less power than other oscillators, but will not be as accurate as the external RTC watch

crystal. Figure 3 shows the block diagram for the low frequency and RTC oscillators.

Rev. 0.1

3

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