STM32F103 Microcontroller
From ScienceZero
Key features of the STM32F103RET6 microcontroller
Contents
Documents and files
Power saving levels
- Sleep mode (Cortex-M3 core stopped, peripherals kept running)
- Stop mode (all clocks are stopped)
- Standby mode (1.8V domain powered-off)
Clocks
HSI (8 MHz internal RC oscillator) HSE (8 MHz external crystal oscillator) LSI (40 kHz internal RC - watchdog, RTCCLK) LSE (32768 Hz external crystal (RTCCLK)) PLLCLK - Output from PLL, 8-64 MHz in 4 MHz steps, 72-128 MHz in 8 MHz steps SYSCLK - PLLCLK, HSI or HSE AHBCLK - SYSCLK / AHB prescaler (this clock has no name in the datasheet, except AHB peripheral clock) PCLK1 - AHBCLK / APB1 prescaler - APB1 bus (max 36 MHz) PCLK2 - AHBCLK / APB2 prescaler - APB2 bus (max 72 MHz) USBCLK - PLLCLK / USB prescaler I2SCLK - SYSCLK SDIOCLK - AHBCLK FSMCCLK - AHBCLK FCLK - AHBCLK ADCCLK - AHBCLK / (APB2 prescaler * ADC prescaler) The MCO pin (PA8) can output one of SYSCLK, HSI, HSE, PLLCLK / 2 When the HSI is the PLL clock input, maximum system clock frequency is 64 MHz. The SDIO AHB interface is clocked with a fixed frequency equal to AHBCLK / 2. If the APB prescaler is 1, timers run at PCLK else at 2 * PCLK
Flash memory
- 0-24 MHz - zero wait state
- 24-48 MHz - one wait state
- 48-72 MHz - two wait states
The prefetch buffer must be switched on/off only when SYSCLOCK is lower than 24 MHz.
Pins with special functions
PA9 ----------> ICL3232 PA10 <--|100R|-- ICL3232 PB2 - Boot1 22 kOhm to +3.3 V or Gnd PC14 - 32 kHz crystal PC15 - 32 kHz crystal PD0 - 8 MHz crystal PD1 - 8 MHz crystal The JTAG pins are in input PU/PD after reset: PA15: JTDI in PU PA14: JTCK in PD PA13: JTMS in PU PB4: NJTRST in PU
Peripherials
64 kB SRAM, 512 kB FLASH 3 x 12 bit A/D converters 2 x 12 bit D/A converters 5 x USART 2 x Advanced-control timers (TIM1 and TIM8) can each be seen as a three-phase PWM multiplexed on 6 channels. 4 x General purpose timer TIM2, TIM3, TIM4 and TIM5 - 16-bit auto-reload up/down counter, a 16-bit prescaler and feature 4 independent channels each for input capture/output compare, PWM or onepulse mode output. This gives up to 16 input captures / output compares / PWMs 2 x Basic timer TIM6 and TIM7 - These timers are mainly used for DAC trigger generation. They can also be used as a generic 16-bit time base. 3 x SPI 2 x I2S (multiplexed on SPI pins) 2 × I2C 1 x SD card interface 1/4/8 bit 1 x USB full speed 1 x CAN network interface 1 x CRC (cyclic redundancy check) calculation unit 1 x 24 bit systick timer 1 x RTC (real-time clock) and backup registers 2 x DMA controller, 5 + 7 channels 1 x Temperature sensor
A/D converters
- ADC1_IN17 is connected to VREFINT 1.2 V (1.16 V - 1.24 V)
- ADC1_IN16 is connected to the Temperature sensor
- ADC2_IN16 and ADC2_IN17 are connected to VSS
- ADC3_IN9, ADC3_IN14, ADC3_IN15, ADC3_IN16 and ADC3_IN17 are connected to VSS
The recommended sampling time for the internal channels is 17.1 μs. The TSVREFE bit must be set to enable both internal channels.
Flash uploader
Command line parameters for STMFlashLoader.exe:
-c --pn 3 --br 115200 --db 8 --sb 1 --to 1000 -i "STM32_High-density_512K" -e --all -d --fn "#H" --v
--pn 3 indicates com port: COM3
Important things to remember
- Registers need a clock to latch the data, so enable all the the upstream clocks before trying to configure a peripheral
- Pins with special functions
Pinout
Pin Function1 Function2 Function3 Function4 ------------------------------------------------------- PA0 - WKUP USART2_CTS ADC0 TIM2_CH1_ETR PA1 - USART2_RTS ADC1 TIM2_CH2 PA2 - USART2_TX ADC2 TIM2_CH3 PA3 - USART2_RX ADC3 TIM2_CH4 PA4 - SPI1_NSS USART2_CK ADC4 PA5 - SPI1_SCK ADC5 PA6 - SPI1_MISO ADC6 TIM3_CH1 PA7 - SPI1_MOSI ADC7 TIM3_CH2 PA8 - USART1_CK TIM1_CH1 MCO PA9 - USART1_TX TIM1_CH2 PA10 - USART1_RX TIM1_CH3 PA11 - USART1_CTS CANRX TIM1_CH4 USBDM PA12 - USART1_RTS CANTX TIM1_ETR USBDP PA13 - JTMS SWDIO PA14 - JTCK SWCLK PA15 - JTDI TIM2_CH1 SPI1_NSS PB0 - ADC8 TIM3_CH3 PB1 - ADC9 TIM3_CH4 PB2 - BOOT1 PB3 - JTDO TIM2_CH2 SPI1_SCK PB4 - JNTRST TIM3_CH1 SPI1_MISO PB5 - I2C1_SMBAI TIM3_CH2 SPI1_MOSI PB6 - I2C1_SCL TIM4_CH1 USART1_TX PB7 - I2C1_SDA TIM4_CH2 USART1_RX PB8 - TIM4_CH3 I2C1_SCL CANRX PB9 - TIM4_CH4 I2C1_SDA CANTX PB10 - I2C2_SCL USART3_TX TIM2_CH3 PB11 - I2C2_SDA USART3_RX TIM2_CH4 PB12 - SPI2_NSS I2C2_SMBAI USART3_CK TIM1_BKIN PB13 - SPI2_SCK USART3_CTS TIM1_CH1N PB14 - SPI2_MISO USART3_RTS TIM1_CH2N PB15 - SPI2_MOSI TIM1_CH3N PC0 - ADC10 PC1 - ADC11 PC2 - ADC12 PC3 - ADC13 PC4 - ADC14 PC5 - ADC15 PC6 - TIM3_CH1 PC7 - TIM3_CH2 PC8 - TIM3_CH3 PC9 - TIM3_CH4 PC10 - USART3_TX PC11 - USART3_RX PC12 - USART3_CK PC13 - TAMPER-RTC PC14 - OSC32_IN PC15 - OSC32_OUT PD0 - OSC_IN PD1 - OSC_OUT PD2 - TIM3_ETR
