STMicroelectronics STM32L151CB Manual page 40

Pin descriptions
Pins
91 57 C4 C5 41
92 58 D3 B5 42
93 59 C3 B4 43
94 60 B4 A4 44
95 61 B3 A3 45
96 62 A3 B3 46
97 - - C3 -
98 - - A2 -
99 63 D4 D3 47
100 64 E4 C4 48
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
3. Applicable to STM32L152xx devices only. In STM32L151xx devices, this pin should be connected to V
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 V
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Table 8. STM32L15xx6/8/B pin definitions (continued)
Pin name
PB5 I/O FT
PB6 I/O FT
PB7 I/O FT
BOOT0 I B
PB8 I/O FT
PB9 I/O FT
PE0 I/O FT
PE1 I/O FT
V S -
SS_3
V S -
DD_3
Table 2 on page
DocID17659 Rev 10
STM32L151x6/8/B, STM32L152x6/8/B
Main
(2)
function
(after reset)
I2C1_SMBA/TIM3_CH2/SPI1_MOSI/
PB5
PB6 I2C1_SCL/TIM4_CH1/USART1_TX
PB7 I2C1_SDA/TIM4_CH2/USART1_RX/PVD_IN
BOOT0
TIM4_CH3/I2C1_SCL/LCD_SEG16/
PB8
TIM4_CH4/I2C1_SDA/LCD_COM3/
PB9
PE0 TIM4_ETR/LCD_SEG36/TIM10_CH1
PE1
V
SS_3
V
DD_3
10.
REF+
Alternate functions
COMP2_INP/LCD_SEG9
-
TIM10_CH1
TIM11_CH1
LCD_SEG37/TIM11_CH1
-
-
.
DD
functionality is provided instead.