STM32U375CE datasheet(26/222 Pages) STMICROELECTRONICS

26 / 222 page

3.10

Peripheral interconnect matrix

Several peripherals have direct connections between them, that allow autonomous communication between them

and support the saving of CPU resources (thus power supply consumption). In addition, these hardware

connections allow fast and predictable latency.

Depending on the peripherals, these interconnections can operate in Run, Sleep, Stop 0, Stop 1, and Stop 2

modes.

3.11

Reset and clock controller (RCC)

The RCC (reset and clock control) manages different reset types, and generates all clocks for the bus and

peripherals.

The clock controller distributes the clocks coming from the different oscillators to the core and to the peripherals. It

also manages the clock gating for low-power modes and ensures the clock robustness. It features:

•

Clock prescaler: in order to get the best trade-off between speed and current consumption, the clock

frequency to the CPU and peripherals can be adjusted by a programmable prescaler.

•

Clock management: in order to reduce the power consumption, the clock controller can stop the clock to

the core, individual peripherals, or memory.

•

System clock source: three different clock sources can be used to drive the system clock (SYSCLK).

–

HSE: high-speed external crystal or clock, from 4 to 50 MHz.

–

HSI16: high-speed internal 16 MHz RC oscillator clock, trimmable by software.

–

MSIS: multi-speed internal RC oscillator clock, from 3 to 96 MHz (six possible frequencies, from two

internal RC oscillators), trimmable by software. When a 32.768 kHz, a 32 MHz or a 16 MHz external

oscillator is present in the application, the MSI frequency can be automatically trimmed by hardware

to reach better accuracy.

•

HSI48 (RC48 with clock recovery system) internal 48 MHz clock source that can be used to drive the USB,

the SDMMC, or the RNG peripherals. This clock can be output on the MCO.

•

Auxiliary clock source: two ultra-low-power clock sources that can be used to drive the real-time clock:

–

LSE (32.768 kHz low-speed external crystal). The LSE can also be configured in bypass mode for an

external clock.

–

LSI (32 kHz low-speed internal RC), also used to drive the independent watchdog. The LSI clock

accuracy is ± 5% accuracy. The LSI clock can be divided by 128 to output a 250 Hz as source clock.

•

Peripheral clock sources: several peripherals can have their own independent clock whatever the system

clock as a result of the MSIK, HSI48, HSI16 and/or low-speed oscillators.

•

Startup clock: after reset, the microcontroller restarts by default with an internal 12 MHz clock MSI. The

prescaler ratio and clock source can be changed by the application program as soon as the code execution

starts.

•

CSS (clock security system): this feature can be enabled by software. If an HSE clock failure occurs, the

master clock automatically switches to HSI16 and a software interrupt is generated if enabled. LSE failure

can also be detected and generates an interrupt.

•

Clock-out capability:

–

MCO (microcontroller clock output): it outputs one of the internal clocks for external use by the

application.

–

LSCO (low-speed clock output): it outputs LSI or LSE in all low-power modes (except VBAT mode).

Several prescalers allow AHB and APB frequencies configuration. The maximum frequency of the AHB and the

APB clock domains is 96 MHz.

STM32U375xx

Functional overview

DS14861 - Rev 2

page 26/222

STM32U375CE Datasheet(PDF) 26 Page - STMicroelectronics

STM32U375CE Datasheet(HTML) 26 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL