STM32F102X4 datasheet(21/69 Pages) STMICROELECTRONICS

21 / 69 page

STM32F102x4, STM32F102x6

Pinouts and pin description

Doc ID 15057 Rev 3

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PB6

I/O

PB6

I2C_SCL(8)

USART1_TX

PB7

I/O

PB7

I2C_SDA(8)

USART1_RX

BOOT0

PB8

I/O

PB8

I2C_SCL

PB9

I/O

PB9

I2C_SDA

VSS_3

SVSS_3

VDD_3

SVDD_3

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

FT= 5 V tolerant.

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 3 on page 12.

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).

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).

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.

The pins number 5 and 6 in the LQFP48 package are configured as OSC_IN/OSC_OUT after reset, however the

functionality of PD0 and PD1 can be remapped by software on these pins. For more details, refer to the Alternate function

I/O and debug configuration section in the STM32F10xxx reference manual.

The use of PD0 and PD1 in output mode is limited as they can only be used at 50 MHz in output mode.

This alternate function can be remapped by software to some other port pins (if available on the used package). For more

details, refer to the Alternate function I/O and debug configuration section in the STM32F10xxx reference manual,

available from the STMicroelectronics website: www.st.com.

Table 4.

low-density STM32F102xx pin definitions (continued)

Pins

Pin name

Main

function(3)

(after reset)

Alternate functions(3) (4)

Default

Remap

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