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BLUENRG-345VC Fiches technique(PDF) 15 Page - STMicroelectronics

No de pièce BLUENRG-345VC
Description  Programmable Bluetooth® Low Energy wireless SoC
PDF  72 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

BLUENRG-345VC Fiches technique(HTML) 15 Page - STMicroelectronics

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•
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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