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Datasheet 搜索 > ST Microelectronics(意法半导体) > STM32L452VEI6 数据手册 > STM32L452VEI6 产品设计参考手册 5/1426 页
STM32L452VEI6
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STM32L452VEI6数据手册
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Contents RM0394
5/1426 DocID027295 Rev 2
5.4.2 Power control register 2 (PWR_CR2) . . . . . . . . . . . . . . . . . . . . . . . . . 149
5.4.3 Power control register 3 (PWR_CR3) . . . . . . . . . . . . . . . . . . . . . . . . . 150
5.4.4 Power control register 4 (PWR_CR4) . . . . . . . . . . . . . . . . . . . . . . . . . 151
5.4.5 Power status register 1 (PWR_SR1) . . . . . . . . . . . . . . . . . . . . . . . . . . 152
5.4.6 Power status register 2 (PWR_SR2) . . . . . . . . . . . . . . . . . . . . . . . . . . 153
5.4.7 Power status clear register (PWR_SCR) . . . . . . . . . . . . . . . . . . . . . . . 154
5.4.8 Power Port A pull-up control register (PWR_PUCRA) . . . . . . . . . . . . . 155
5.4.9 Power Port A pull-down control register (PWR_PDCRA) . . . . . . . . . . 156
5.4.10 Power Port B pull-up control register (PWR_PUCRB) . . . . . . . . . . . . . 156
5.4.11 Power Port B pull-down control register (PWR_PDCRB) . . . . . . . . . . 157
5.4.12 Power Port C pull-up control register (PWR_PUCRC) . . . . . . . . . . . . 157
5.4.13 Power Port C pull-down control register (PWR_PDCRC) . . . . . . . . . . 158
5.4.14 Power Port D pull-up control register (PWR_PUCRD) . . . . . . . . . . . . 158
5.4.15 Power Port D pull-down control register (PWR_PDCRD) . . . . . . . . . . 159
5.4.16 Power Port E pull-up control register (PWR_PUCRE) . . . . . . . . . . . . . 159
5.4.17 Power Port E pull-down control register (PWR_PDCRE) . . . . . . . . . . 160
5.4.18 Power Port H pull-up control register (PWR_PUCRH) . . . . . . . . . . . . 160
5.4.19 Power Port H pull-down control register (PWR_PDCRH) . . . . . . . . . . 161
5.4.20 PWR register map and reset value table . . . . . . . . . . . . . . . . . . . . . . . 162
6 Reset and clock control (RCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.1 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.1.1 Power reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.1.2 System reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.1.3 Backup domain reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
6.2 Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
6.2.1 HSE clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
6.2.2 HSI16 clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
6.2.3 MSI clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
6.2.4 HSI48 clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
6.2.5 PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
6.2.6 LSE clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
6.2.7 LSI clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
6.2.8 System clock (SYSCLK) selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
6.2.9 Clock source frequency versus voltage scaling . . . . . . . . . . . . . . . . . . 175
6.2.10 Clock security system (CSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
6.2.11 Clock security system on LSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

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