STM32L100RC datasheet(34/104 Pages) STMICROELECTRONICS

34 / 104 page

Pin descriptions

STM32L100RC

34/104

DocID024995 Rev 4

PB3

I/O

JTDO

TIM2_CH2/SPI1_SCK/

SPI3_SCK/I2S3_CK/

LCD_SEG7/JTDO

COMP2_INM

PB4

I/O

NJTRST

TIM3_CH1/SPI1_MISO/

SPI3_MISO/LCD_SEG8/

NJTRST

COMP2_INP

PB5

I/O

PB5

TIM3_CH2/I2C1_SMBA/

SPI1_MOSI/SPI3_MOSI/

I2S3_SD/LCD_SEG9

COMP2_INP

PB6

I/O

PB6

TIM4_CH1/I2C1_SCL/

USART1_TX

COMP2_INP

PB7

I/O

PB7

TIM4_CH2/I2C1_SDA/

USART1_RX

COMP2_INP/PVD_IN

BOOT0

PB8

I/O

PB8

TIM4_CH3/TIM10_CH1/

I2C1_SCL/LCD_SEG16

PB9

I/O

PB9

TIM4_CH4/TIM11_CH1/

I2C1_SDA/LCD_COM3

VSS_3

S-

VSS_3

VDD_3

S-

VDD_3

1. I = input, O = output, S = supply.

2. FT = 5 V tolerant.

3. The PC14 and PC15 I/Os are only configured as OSC32_IN/OSC32_OUT when the LSE oscillator is ON (by setting the

LSEON bit in the RCC_CSR register). The LSE oscillator pins OSC32_IN/OSC32_OUT can be used as general-purpose

PH0/PH1 I/Os, respectively, when the LSE oscillator is off (after reset, the LSE oscillator is off). The LSE has priority over

the GPIO function. For more details, refer to Using the OSC32_IN/OSC32_OUT pins as GPIO PC14/PC15 port pins

section in the STM32L100xx, STM32L151xx, STM32L152xx and STM32L162xx reference manual (RM0038).

4. The PH0 and PH1 I/Os are only configured as OSC_IN/OSC_OUT when the HSE oscillator is ON (by setting the HSEON

bit in the RCC_CR register). The HSE oscillator pins OSC_IN/OSC_OUT can be used as general-purpose PH0/PH1 I/Os,

respectively, when the HSE oscillator is off ( after reset, the HSE oscillator is off ). The HSE has priority over the GPIO

function.

Table 7. STM32L100RC pin definitions (continued)

Pins

Pin name

Main

function

(after reset)

Pin functions

Alternate functions

Additional functions

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