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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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APM32F003F6P7-R датащи(PDF) 14 Page - Geehy Semiconductor Co., Ltd. |
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APM32F003F6P7-R датащи(HTML) 14 Page - Geehy Semiconductor Co., Ltd. |
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14 / 56 page  www.geehy.com 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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