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Giải thích chi tiết về linh kiện  Arm® Cortex®-M0 based 32-bit MCU
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APM32F003F6P6-R bảng dữ liệu(HTML) 14 Page - Geehy Semiconductor Co., Ltd.

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Page 13
Clock
The four clock sources HXT, HXT user-ext, HIRC and LIRC can be the master
clock, as shown in the following table:
Table 4 It can be used as the clock source of the master clock
Clock source
description
HXT
1-24MHz high speed external crystal oscillator
HXT user-ext
Maximum 24MHz high-speed external clock signal
HIRC
48MHz high speed internal RC oscillator
LIRC
128KHz low speed internal RC oscillator
Each clock source can be turned on or off independently to optimize power
consumption. In order to make the system start quickly, the clock controller
automatically uses HIRC's divide by 8 (HIRC/8) as the master clock after reset.
The reason is that the stabilization time of HIRC is short, and the HIRC/8 can
ensure the safe start of the system under poor VDD conditions. Once other clock
sources are stable, the user program can switch the master clock to another
clock source.



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