STM32F101X4 datasheet(24/73 Pages) STMICROELECTRONICS

Part #	STM32F101X4

Description	Low-density access line, ARM-based 32-bit MCU with 16 or 32 KB Flash, 5 timers, ADC and 4 communication interfaces

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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24 / 73 page

Pinouts and pin description

STM32F101x4, STM32F101x6

24/74

Doc ID 15058 Rev 3

40

56

31

PB4

I/O

FT

NJTRST

TIM3_CH1 / PB4

SPI_MISO

41

57

32

PB5

I/O

PB5

I2C_SMBA

TIM3_CH2 /

SPI_MOSI

42

58

33

PB6

I/O

FT

PB6

I2C_SCL(7)

USART1_TX

43

59

34

PB7

I/O

FT

PB7

I2C_SDA(7)

USART1_RX

44

60

35

BOOT0

I

BOOT0

45

61

-

PB8

I/O

FT

PB8

I2C_SCL

46

62

-

PB9

I/O

FT

PB9

I2C_SDA

47

63

36

VSS_3

SVSS_3

48

64

1

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 SPI, USART1 & USART2 and TIM2 & TIM 3, respectively. Refer to Table 2 on page 10.

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 STM32F10xxx reference manual, available from the

STMicroelectronics website: www.st.com.

7.

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.

8.

The pins number 2 and 3 in the VFQFPN36 package, and 5 and 6 in the LQFP48 and LQFP64 packages 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.

Table 4.

Low-density STM32F101xx pin definitions (continued)

Pins

Pin name

Main

function(3)

(after reset)

Alternate functions(3)(4)

Default

Remap

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STM32F101X4 Datasheet(PDF) 24 Page - STMicroelectronics

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