APM32F003F4P6-R datasheet(14/56 Pages) GEEHY

Il numero della parte	APM32F003F4P6-R

Spiegazioni elettronici	Arm® Cortex®-M0 based 32-bit MCU

PDF	56 Pages

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Produttore elettronici	GEEHY [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.

APM32F003F4P6-R Scheda tecnica(PDF) 14 Page - Geehy Semiconductor Co., Ltd.