STM32L151XE datasheet(45/134 Pages) STMICROELECTRONICS

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DocID025433 Rev 8

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STM32L151xE STM32L152xE

Pin descriptions

136

58 C5

PB6

I/O FT

PB6

TIM4_CH1/I2C1_SCL/

USART1_TX

COMP2_INP

137

59 B6

PB7

I/O FT

PB7

TIM4_CH2/I2C1_SDA/

USART1_RX

COMP2_INP/

PVD_IN

138

60 A7

BOOT0

139

61 D5

PB8

I/O FT

PB8

TIM4_CH3/TIM10_CH1/

I2C1_SCL/

LCD_SEG16

140

62 C6

PB9

I/O FT

PB9

TIM4_CH4/

TIM11_CH1/I2C1_SDA/

LCD_COM3

141

PE0

I/O FT

PE0

TIM4_ETR/TIM10_CH1/

LCD_SEG36

142

PE1

I/O FT

PE1

TIM11_CH1/LCD_SEG37

143

63 C7

VSS_3

S-

VSS_3

144

100 64

B8,

VDD_3

S-

VDD_3

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

2. Function availability depends on the chosen device.

3. Applicable to STM32L152xE devices only. In STM32L151xE devices, this pin should be connected to VDD.

4. 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 STM32L151xx, STM32L152xx and STM32L162xx reference manual (RM0038).

5. 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 8. STM32L151xE and STM32L152xE pin definitions (continued)

Pins

Pin name

Main

function(2)

(after

reset)

Pin functions

Alternate functions

Additional

functions

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