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BLUENRG-LP 数据表(PDF) 15 Page - STMicroelectronics |
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BLUENRG-LP 数据表(HTML) 15 Page - STMicroelectronics |
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15 / 72 page  • Always 16 MHz requested by a few peripherals like serial interfaces (to maintain fixed the baud rate while system clock is switching from one frequency to another) or like the Flash controller and radio (to have a fixed reference clock to manage delays) Figure 6. Clock tree CLK_32MHz CLK_16MHz /2 /4 /2 CLK_SPI2/I2S2 SYSCLK PRE /1, /2, .. , /32 SYSCLK PRE /1, /2, .. , /64 SYSCLKDIV SYSCLKDIV CLK_SYS to CPU, AHB0, APB0, APB1, SRAM, PKA, CLK_SPI1 LCO LCOSEL LSE OSC 32kHz /1, /2, .. , /16 CLKANA_ADC CLK_SMPS CLK_SYS HSE HSI CLK_16MHz/512 MCOSEL MCO CLK_16MHz/512 CLKSLOWSEL CK_RTC, CK_WDG, CK_BLEWKUP OSC32k_OUT OSC32k_IN LSI RCO 32kHz CLK_BLE32, CLKDIG_ADC CLKANA_ADC, CLK_USART, CLK_I2C, CLK_BLE16, CLK_FLASH, CLK_PWR, CLK_RNG CLK_LPUART CLKSYS_BLE CLK_TIM1 CLK_SMPS HSE OSC 32MHz HSI RCO+PLL 64MHz OSC_OUT OSC_IN HSESEL 0 1 /4 /2 CLK_16MHz HSESEL 0 1 SMPSDIV 0 1 BLECLKDIV 0 1 HSESEL 0 1 HSESEL 0 1 SP2CKSEL 0 1 LSI_LPMU RCO 32kHz CLK_SPI3/I2S3 SP3CKSEL 0 1 It is possible to output some internal clocks on external pads: • the low speed clocks can be output on the LCO I/O • the high speed clocks can be output on the MCO I/O This is possible by programming the associated I/O in the correct alternate function. Most of the peripherals only use the system clock except: • I2C, USART, LPUART: they always use a16 MHz clock to have a fixed reference clock for baud rate management. The goal is to allow the CPU to boost or slow down the system clock (depending on on-going activities) without impacting a potential on-going serial interface transfer on external I/Os BlueNRG-LP Clock management DS13282 - Rev 2 page 15/72 |
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