Design and implementation of a 32-bit MCU development board

     The STM32F100VBT6 uses the ARM Cortex-M3 32-bit RISC core, operates at 24MHz, integrates high-speed embedded memory (up to 128kB flash memory, up to 8kB SRAM) and various enhanced peripherals and I/O connected to two APB buses. All devices provide two I2C, two SPI, one HDMI CEC and up to 3 USART Peugeot communication interfaces as well as a 12-bit ADC, two 12-bit DACs and six general-purpose 16-bit timers and PWM timers.

　　RISC microprocessors not only streamline the instruction set, but also adopt superscalar and superpipeline structures; they have only dozens of instructions, but greatly enhance parallel processing capabilities. The MIPS processor launched by SGI adopts a superpipeline structure. These RISC processors play a core role in building parallel reduced instruction set multiprocessors.
 

　　Figure 1 STM32F100xx series block diagram

　　Introduction to STM32F100xx

　　32-bit MCU with 16 kB ~ 128 kB Flash, 12 timers, ADC, DAC and 8 communication interfaces The STM32F100xx series integrates a high-performance ARM Cortex?-M3 32-bit RISC core operating at 24MHz, high-speed embedded memory (up to 128 kB flash memory, up to 8 kB SRAM) and a variety of enhanced peripherals and I/O connected to two APB buses. All devices provide standard communication interfaces, a 12-bit ADC, two 12-bit DACs, 6 general-purpose 16-bit timers and advanced control PWM timers.

　　Figure 2 STM32F100VBT6 evaluation board hardware block diagram

　　The STM32F100xx low/medium density product series has an operating temperature range of –40~+85℃ and –40~+105℃, and a supply voltage range of 2.0V~3.6V.

　　The STM32F100xx series devices are available in three different packages with 48 to 100 pins.

    These features make the STM32F100xx series of microcontrollers suitable for a wide range of applications.

　　Figure 3 STM32F100VBT6 evaluation board circuit diagram STM32F100VBT6 main features

　　Core: ARM 32-bit Cortex-M3 CPU

　　24MHz maximum frequency and 1.25DMIPS/MHz (Dhrystone 2.1) performance

　　Single-cycle multiplication and hardware division

　　Memory

　　16 kB ~128 kB Flash memory

　　4kB ~8kB SRAM

　　Clock, reset and power management

　　2.0V~3.6V application power supply and I/O

　　POR, PDR and Programmable Voltage Detectors

　　4MHz~24MHz crystal oscillator

　　Internal 8MHz factory pre-calibrated RC

　　Internal 40kHz RC

　　PLL for CPU clock

　　32kHz oscillator for RTC with calibration

　　Low power consumption

　　Sleep, Shutdown, and Standby modes

　　VBAT power supply for RTC and backup registers

　　Debug Mode

　　Serial Wire Debug (SWD) and JTAG interfaces

　　DMA

　　7-channel DMA controller

　　Supported peripherals: Timers, ADC, SPI, I2C, USART and DAC

　　1×12-bit, 1.2μs A/D converter (up to 16 channels)

　　Conversion range: 0V~3.6V

　　Temperature Sensor

　　2×12-bit D/A converters

　　Fast I/O ports up to 80

　　37/51/80 I/Os, all mappable on 16 external interrupt vectors, and almost all 5V tolerant

　　Up to 12 timers

　　Up to 3 16-bit timers, each with 4 IC/OC/PWM or pulse counters

　　16-bit, 6-channel advanced control timer: up to 6 channels, capable of PWM output, dead time generation and emergency stop

　　1 16-bit timer with 2 IC/OC, 1 OCN/PWM, dead time generation and emergency stop functions

　　2 16-bit timers, each with IC/OC/OCN/PWM, dead time generation and emergency stop functions

　　2 watchdog timers (independent and window)

　　SysTick timer: 24-bit down counter

　　2 16-bit basic timers, can drive DAC

　　Up to 8 communication interfaces

　　I2C interface up to 2

　　Up to 3 USARTs

　　SPI up to 2

　　Consumer Electronics Control Interface

　　CRC calculation unit, 96-bit unique ID

　　ECOPACK package

　　STM32100B-EVAL evaluation board

　　The ARM Cortex-M3 processor combines a variety of breakthrough technologies, allowing chip suppliers to provide ultra-low-cost chips, with a core performance of only 33,000 gates up to 1.2DMIPS/MHz. The processor also integrates many tightly coupled system peripherals, allowing the system to meet the control requirements of next-generation products. The ARM Cortex-M3 processor is the first time ARM has provided technology for low-cost applications.

　　The STM32100B-EVAL is an evaluation board for STMicroelectronics' ARMTM Cortex-M3-based STM32F100VBT6 microcontroller. It is designed to be used as a comprehensive development environment with HDMI CEC, 2 I2C channels, 2 SPI channels, 3 USART channels, 8kB internal SRAM, 128kB internal Flash, and JTAG and SWD debugging support.

　　With a full set of hardware evaluation features, the STM32100B-EVAL evaluation board is designed to help developers evaluate all device peripherals and develop their own applications.

　　The evaluation board integrates ST-LINK, which is a development tool designed by STMicroelectronics for beginners to learn, evaluate and develop STM8 series and STM32 series MCUs. It can act as an embedded in-circuit debugger and programmer for the STM32F100VBT6 MCU.

　　Figure 4 STM32F100VBT6 evaluation board circuit diagram

　　STM32100B-EVAL evaluation board main features

　　3 5V power supply options: power jack, ST-LINK connector or daughter board

　　Boot from user Flash, system memory or SRAM

　　speaker

　　1GB MicroSD Card?

　　16MB Serial Flash

　　I2C/SMBus compatible serial interface temperature sensor

　　2 RS-232 communication channels, one of which supports RTS/CTS handshake signals

　　IrDA Transceiver

　　Induction Motor Control Connectors

　　JTAG and SWD debugging support

　　240×320 TFT color LCD

　　Joystick with four-way control and selector

　　Reset, wakeup, tamper, and user buttons

　　4 LEDs

　　RTC with battery backup

　　Expansion connector for daughterboard or wraparound board

　　Embedded ST-LINK

　　IDD current measurement circuit

　　HDMI CEC

　　GEC