STM32F102X8 datasheet(22/80 Pages) STMICROELECTRONICS

22 / 80 page

Pinout and pin description

STM32F102x8, STM32F102xB

22/80

DocID15056 Rev 5

PA15

I/O

JTDI

TIM2_CH1_ETR

/ PA15

/SPI1_NSS

PC10

I/O

PC10

USART3_TX

PC11

I/O

PC11

USART3_RX

PC12

I/O

PC12

USART3_CK

PD2

I/O

PD2

TIM3_ETR

PB3

I/O

JTDO

TIM2_CH2/ PB3/

TRACESWO/

SPI1_SCK

PB4

I/O

JNTRST

TIM3_CH1 / PB4

SPI1_MISO

PB5

I/O

PB5

I2C1_SMBA

TIM3_CH2 /

SPI1_MOSI

PB6

I/O

PB6

I2C1_SCL(8)/ TIM4_CH1

USART1_TX

PB7

I/O

PB7

I2C1_SDA(8)/ TIM4_CH2

USART1_RX

BOOT0

PB8

I/O

PB8

TIM4_CH3

I2C1_SCL

PB9

I/O

PB9

TIM4_CH4

I2C1_SDA

VSS_3

SVSS_3

VDD_3

SVDD_3

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

2. FT= 5 V tolerant.

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

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

called SPI1, USART1 & USART2 and TIM2 & TIM 3, respectively. Refer to Table 2 on page 9Table 3 on page 12.

4. If several peripherals share the same I/O pin, to avoid conflict between these alternate functions only one peripheral should

be enabled at a time through the peripheral clock enable bit (in the corresponding RCC peripheral clock enable register).

5. PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current (3

mA), the use of GPIOs PC13 to PC15 in output mode is limited: the speed should not exceed 2 MHz with a maximum load

of 30 pF and these IOs must not be used as a current source (e.g. to drive an LED).

6. Main function after the first backup domain power-up. Later on, it depends on the contents of the Backup registers even

after reset (because these registers are not reset by the main reset). For details on how to manage these IOs, refer to the

Battery backup domain and BKP register description sections in the STM32F102xx reference manual, available from the

STMicroelectronics website: www.st.com.

Table 4. Medium-density STM32F102xx pin definitions (continued)

Pins

Pin name

Main

function(3)

(after reset)

Alternate functions(3) (4)

Default

Remap

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