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STM32F102xB Datasheet(PDF) 22 Page - STMicroelectronics |
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STM32F102xB Datasheet(HTML) 22 Page - STMicroelectronics |
22 / 76 page Pinout and pin description STM32F102x8, STM32F102xB 22/76 Doc ID 15056 Rev 4 41 57 PB5 I/O PB5 I2C1_SMBA TIM3_CH2 / SPI1_MOSI 42 58 PB6 I/O FT PB6 I2C1_SCL(8)/ TIM4_CH1 USART1_TX 43 59 PB7 I/O FT PB7 I2C1_SDA(8)/ TIM4_CH2 USART1_RX 44 60 BOOT0 I BOOT0 45 61 PB8 I/O FT PB8 TIM4_CH3 I2C1_SCL 46 62 PB9 I/O FT PB9 TIM4_CH4 I2C1_SDA 47 63 VSS_3 SVSS_3 48 64 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. 7. 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. 8. 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. Medium-density STM32F102xx pin definitions (continued) Pins Pin name Main function(3) (after reset) Alternate functions(3) (4) Default Remap |
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