STM32L100X6 datasheet(36/103 Pages) STMICROELECTRONICS

36 / 103 page

Pin descriptions

STM32L100x6/8/B-A

36/103

DocID025966 Rev 6

PB3

I/O

JTDO

TIM2_CH2/PB3/SPI1_SCK/

LCD_SEG7/JTDO

COMP2_INM

PB4

I/O

NJTRST

TIM3_CH1/PB4/SPI1_MISO/

LCD_SEG8/NJTRST

COMP2_INP

PB5

I/O

PB5

I2C1_SMBA/TIM3_CH2/

SPI1_MOSI/LCD_SEG9

COMP2_INP

PB6

I/O

PB6

I2C1_SCL/TIM4_CH1/

USART1_TX

PB7

I/O

PB7

I2C1_SDA/TIM4_CH2

/USART1_RX

PVD_IN

BOOT0

PB8

I/O

PB8

TIM4_CH3/I2C1_SCL/

LCD_SEG16/

TIM10_CH1

PB9

I/O

PB9

TIM4_CH4/I2C1_SDA/

LCD_COM3/

TIM11_CH1

VSS_3

S-

VSS_3

VDD_3

S-

VDD_3

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

2. Function availability depends on the chosen device. For devices having reduced peripheral counts, it is always the lower

number of peripheral that is included. For example, if a device has only one SPI and two USARTs, they will be called SPI1

and USART1 & USART2, respectively. Refer to Table 2 on page 10.

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

PC14/PC15 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 STM32L1xxxx 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 9. STM32L100x6/8/B-A pin definitions (continued)

Pins

Pin name

Main

function(2)

(after reset)

Pin functions

Alternate functions

Additional

functions

STM32L100X6 Datasheet(PDF) 36 Page - STMicroelectronics

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