STM32L151X8 datasheet(42/133 Pages) STMICROELECTRONICS

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Pin descriptions

STM32L151x6/8/B STM32L152x6/8/B

42/133

DocID17659 Rev 12

90 56 A4

PB4

I/O

NJTRST

TIM3_CH1/PB4/

SPI1_MISO/LCD_SEG8/

NJTRST

COMP2_INP

91 57 C4

PB5

I/O

PB5

I2C1_SMBA/TIM3_CH2/

SPI1_MOSI/LCD_SEG9

COMP2_INP

92 58 D3

PB6

I/O

PB6

I2C1_SCL/TIM4_CH1/

USART1_TX

93 59 C3

PB7

I/O

PB7

I2C1_SDA/TIM4_CH2/

USART1_RX

PVD_IN

94 60 B4

BOOT0

95 61 B3

PB8

I/O

PB8

TIM4_CH3/I2C1_SCL/

LCD_SEG16/TIM10_CH1

96 62 A3

PB9

I/O

PB9

TIM4_CH4/I2C1_SDA/

LCD_COM3/TIM11_CH1

PE0

I/O

PE0

TIM4_ETR/LCD_SEG36/

TIM10_CH1

PE1

I/O

PE1

LCD_SEG37/TIM11_CH1

99 63 D4

VSS_3

S-

VSS_3

100 64 E4

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 11.

3. Applicable to STM32L152xx devices only. In STM32L151xx 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

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).

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.

6. Unlike in the LQFP64 package, there is no PC3 in the TFBGA64 package. The VREF+ functionality is provided instead.

Table 8. STM32L151x6/8/B and STM32L152x6/8/B pin definitions (continued)

Pins

Pin name

Main

function(2)

(after reset)

Pins functions

Alternate functions

Additional

functions

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