STM32L151C6(2013) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32L151C6
(Rev.:2013)

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

STM32L151x6/8/B, STM32L152x6/8/B

Functional overview

Figure 2. Clock tree

OSC_OUT

OSC_IN

OSC32_IN

OSC32_OUT

MCO

MSI RC

16 MHz

HSI RC

1-24 MHz

HSE OSC

MSI

ADCCLK

to ADC

Peripheral clock

enable

HSI

PLLSRC PLLMUL

x3,x4,x6,x8

x12,x16,x24

x32,x48

48 MHz

PLLVCO/2 USBCLK

to USB interface

SW

PLLDIV

/2,/3,/4

HSI

PLLCLK

HSE

CSS

SYSCLK 32 MHz max

AHB

Prescaler

/1, 2..512

32 MHz max

Clock

Enable

/8

APB1

Prescaler

/1, 2, 4, 8, 16

HCLK

to AHB bus, core,

memory and DMA

to Cortex System timer

FCLK Cortex

free running clock

32 MHz max

PCLK1

to APB1

Peripheral Clock peripherals

Enable

If (APB1 prescaler =1) x1

else x2

to TIM2,3,4,6 and 7

TIMxCLK

Peripheral Clock

Enable

APB2

Prescaler

/1, 2, 4, 8, 16

32 MHz max

PCLK2

peripherals to APB2

Peripheral Clock

Enable

/2,4,

8,16

If (APB2 prescaler =1) x1

to TIM9, 10, and 11

else x2

TIMxCLK

to

Timer 9, 10, 11 ETR

Peripheral Clock

Enable

LSE OSC LSE

32.768 kHz

to RTC

RTCCLK

RTCSEL[1:0]

to LCD

LSI RC

37 kHz

LSI

to Independent Watchdog (IWDG)

IWDGCLK

/1,2,4,

8,16

MCOSEL

SYSCLK

HSI

MSI

HSE

PLLCLK

LSI

LSE

Legend :

HSE = High-speed external clock signal

HSI = High-speed internal clock signal

LSI = Low-speed internal clock signal

LSE = Low-speed external clock signal

MSI = Multispeed internal clock signal

ai17212c

2. For the USB function to be available, both HSE and PLL must be enabled, with the CPU running at either

24 MHz or 32 MHz.

Doc ID 17659 Rev 8

21/121

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