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STM32L151VB-A 数据表(PDF) 16 Page - STMicroelectronics |
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STM32L151VB-A 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 130 page  Functional overview STM32L151x6/8/B-A STM32L152x6/8/B-A 16/130 DocID024330 Rev 5 2. CPU frequency changes from initial to final must respect "FCPU initial < 4*FCPU final" to limit VCORE drop due to current consumption peak when frequency increases. It must also respect 5 µs delay between two changes. For example to switch from 4.2 MHz to 32 MHz, you can switch from 4.2 MHz to 16 MHz, wait 5 µs, then switch from 16 MHz to 32 MHz. 3. Should be USB-compliant from I/O voltage standpoint, the minimum VDD is 3.0 V. Table 4. CPU frequency range depending on dynamic voltage scaling CPU frequency range Dynamic voltage scaling range 16 MHz to 32 MHz (1ws) 32 kHz to 16 MHz (0ws) Range 1 8 MHz to 16 MHz (1ws) 32 kHz to 8 MHz (0ws) Range 2 2.1 MHz to 4.2 MHz (1ws) 32 kHz to 2.1 MHz (0ws) Range 3 |
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