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These devices are high performance, low power consumption 32-bit microcontrollers based around an Arm® Cortex®-M0+ processor core. The Cortex®-M0+ is a next-generation processor core which is tightly coupled with Nested Vectored Interrupt Controller (NVIC), SysTick timer and including advanced debug support.
The devices operate at a frequency of up to 48 MHz with a Flash accelerator to obtain maximum efficiency. They provide up to 64 KB of embedded Flash memory for code/data storage and 8 KB of embedded SRAM memory for system operation and application program usage. A variety of peripherals, such as ADC, 2-channel DAC, I2 C, UART, SPI, QSPI, GPTM, SCTM, BFTM, CRC- 16/32, LSTM, WDT, 16-channel music synthesizer, SW-DP (Serial Wire Debug Port), etc., are also implemented in the devices. Several power saving modes provide the flexibility for maximum optimization between wakeup latency and power consumption, an especially important consideration in low power applications.
The devices integrate Wave Table synthesis function. They can operate up to 16 channels of Wave Table synthesis at one time and control the MIDI Engine to generate melody by setting the special registers. The Wave Table synthesis waveform data including instrument tone, MIDI scores, voice, sound effect, etc., are stored in the internal SPI Flash Data Memory. With these features, the devices provide enhanced functions and higher performance.
The above features ensure that the devices are suitable for use in a wide range of applications, especially in areas such as electronic organs, digital pianos, electronic drums, electric guitars, electric accordions and so on.
▆ 32-bit Arm® Cortex®-M0+ processor core
▆ Up to 48 MHz operating frequency
▆ Single-cycle multiplication
▆ Integrated Nested Vectored Interrupt Controller (NVIC)
▆ 24-bit SysTick timer
The Cortex®-M0+ processor is a very low gate count, highly energy efficient processor that is intended for microcontrollers and deeply embedded applications that require an area optimized, low-power processor. The processor is based on the ARMv6-M architecture and supports Thumb® instruction sets; single-cycle I/O ports; hardware multiplier and low latency interrupt respond time.
▆ Up to 64 KB on-chip Flash memory for instruction/data and options storage
▆ 8 KB on-chip SRAM
▆ Supports multiple booting modes
The Arm® Cortex®-M0+ processor accesses and debug accesses share the single external interface to external AHB peripherals. The processor accesses take priority over debug accesses. The maximum address range of the Cortex®-M0+ is 4 GB since it has a 32-bit bus address width. Additionally, a pre-defined memory map is provided by the Cortex®-M0+ processor to reduce the software complexity of repeated implementation by different device vendors. However, some regions are used by the Arm® Cortex®-M0+ system peripherals. Refer to the Arm® Cortex®-M0+ Technical Reference Manual for more information. Figure 2 in the Overview chapter shows the memory map of the device, including code, SRAM, peripheral and other pre-defined regions.
▆ Flash accelerator to obtain maximum efficiency
▆ 32-bit word programming with In System Programming Interface (ISP) and In Application Programming (IAP)
▆ Flash protection capability to prevent illegal access
The Flash Memory Controller, FMC, provides all the necessary functions and pre-fetch buffer for the embedded on-chip Flash Memory. Since the access speed of the Flash Memory is slower than the CPU, a wide access interface with a pre-fetch buffer and cache are provided for the Flash Memory in order to reduce the CPU waiting time which will cause CPU instruction execution delay. The Flash Memory word programming/page erase functions are also provided.
▆ Supply supervisor:
● Power On Reset / Power Down Reset – POR/PDR
● Brown-Out Detector – BOD
● Programmable Low Voltage Detector – LVD
The Reset Control Unit, RSTCU, has three kinds of reset, a power on reset, a system reset and an APB unit reset. The power on reset, known as a cold reset, resets the full system during power up. A system reset resets the processor core and peripheral IP components with the exception of the SW-DP controller. The resets can be triggered by an external signal, internal events and the reset generators.
▆ External 4 to 16 MHz crystal oscillator
▆ Internal 8 MHz RC oscillator trimmed to ±2 % accuracy at 3.3 V operating voltage and 25 °C operating temperature
▆ Internal 32 kHz RC oscillator
▆ Integrated system clock PLL
▆ Independent clock divider and gating bits for peripheral clock sources
The Clock Control unit, CKCU, provides a range of oscillator and clock functions. These include a High Speed Internal RC oscillator (HSI), a High Speed External crystal oscillator (HSE), a Low Speed Internal RC oscillator (LSI), a Phase Lock Loop (PLL), an HSE clock monitor, clock prescalers, clock multiplexers, APB clock divider and gating circuitry. The clocks of AHB, APB and Cortex®-M0+ are derived from the system clock (CK_SYS) which can come from the LSI, HSI, HSE or PLL. The Watchdog Timer and Low Speed Timer (LSTM) use the LSI as their clock source.
▆ Single VDD power supply: 2.3 V to 3.6 V
▆ Integrated 1.5 V LDO regulator for MCU core, peripherals and memories power supply
▆ VDD power supply for LSTM
▆ Two power domains: VDD, VCORE
▆ Four power saving modes: Sleep, Deep-Sleep1, Deep-Sleep2, Power-Down
Power consumption can be regarded as one of the most important issues for many embedded system applications. Accordingly the Power Control Unit, PWRCU, in the devices provides many types of power saving modes such as Sleep, Deep-Sleep1, Deep-Sleep2 and Power-Down mode. These operating modes reduce the power consumption and allow the application to achieve the best trade-off between the conflicting demands of CPU operating time, speed and power consumption.
▆ Up to 16 EXTI lines with configurable trigger source and type
▆ All GPIO pins can be selected as EXTI trigger source
▆ Source trigger type includes high level, low level, negative edge, positive edge or both edges
▆ Individual interrupt enable, wakeup enable and status bits for each EXTI line
▆ Software interrupt trigger mode for each EXTI line
▆ Integrated deglitch filter for short pulse blocking
The External Interrupt/Event Controller, EXTI, comprises 16 edge detectors which can generate a wake-up event or interrupt requests independently. Each EXTI line can also be masked independently.
▆ 12-bit SAR ADC engine
▆ Up to 1 Msps conversion rate
▆ Up to 16 external analog input channels
A 12-bit multi-channel ADC is integrated in the devices. There are multiplexed channels, which include 16 external analog signal channels and 2 internal channels which can be measured. If the input voltage is required to remain within a specific threshold window, an Analog Watchdog function will monitor and detect these signals. An interrupt will then be generated to inform the device that the input voltage is not within the preset threshold levels. There are three conversion modes to convert an analog signal to digital data. The ADC can be operated in one shot, continuous and discontinuous conversion modes.
▆ Up to 49 GPIOs
▆ Port A, B, C, D are mapped as 16 external interrupts – EXTI
▆ Almost all I/O pins have a configurable output driving current.
There are up to 49 General Purpose I/O pins, GPIO, named PA0 ~ PA15, PB0 ~ PB15, PC0 ~ PC15 and PD0 for the implementation of logic input/output functions. Each of the GPIO ports has a series of related control and configuration registers to maximize flexibility and to meet the requirements of a wide range of applications.
The GPIO ports are pin-shared with other alternative functions to obtain maximum functional flexibility on the package pins. The GPIO pins can be used as alternative functional pins by configuring the corresponding registers regardless of the input or output pins. The external interrupts on the GPIO pins of the devices have related control and configuration registers in the External Interrupt Control Unit, EXTI.
▆ 16-bit up, down, up/down auto-reload counter
▆ Up to 4 independent channels
▆ 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
▆ Input Capture function
▆ Compare Match Output
▆ PWM waveform generation with Edge-aligned and Center-aligned
▆ Single Pulse Mode Output
▆ Encoder interface controller with two inputs using quadrature decoder
The General-Purpose Timer, GPTM, consists of one 16-bit up/down-counter, four 16-bit Capture/ Compare Registers (CCRs), one 16-bit Counter Reload Register (CRR) and several control/status registers. They can be used for a variety of purposes including general time measurement, input signal pulse width measurement, output waveform generation such as single pulse generation or PWM output generation. The GPTM also supports an Encoder Interface using a quadrature decoder with two inputs.
▆ 16-bit up and auto-reload counter
▆ One channel for each timer
▆ 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
▆ Input Capture function
▆ Compare Match Output
▆ PWM waveform generation with Edge-aligned
The Single-Channel Timer, SCTM, consists of one 16-bit up-counter, one 16-bit Capture/Compare Register (CCR), one 16-bit Counter-Reload Register (CRR) and several control/status registers. It can be used for a variety of purposes including general timer, input signal pulse width measurement or output waveform generation such as single pulse generation or PWM output.
▆ 32-bit compare match count-up counter – no I/O control
▆ One shot mode – stops counting when compare match occurs
▆ Repetitive mode – restarts counter when compare match occurs
The Basic Function Timer, BFTM, is a simple count-up 32-bit counter designed to measure time intervals and generate a one shot or repetitive interrupts. The BFTM can operate in two functional modes which are repetitive and one shot modes. In the repetitive mode the BFTM restarts the counter when a compare match event occurs. The BFTM also supports a one shot mode which will force the counter to stop counting when a compare match event occurs.
▆ 16-bit up and auto-reload counter
▆ One channel for each timer
▆ 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
▆ Input Capture function
▆ Compare Match Output
▆ PWM waveform generation with Edge-aligned
The Single-Channel Timer, SCTM, consists of one 16-bit up-counter, one 16-bit Capture/Compare Register (CCR), one 16-bit Counter-Reload Register (CRR) and several control/status registers. It can be used for a variety of purposes including general timer, input signal pulse width measurement or output waveform generation such as single pulse generation or PWM output.
▆ 32-bit compare match count-up counter – no I/O control
▆ One shot mode – stops counting when compare match occurs
▆ Repetitive mode – restarts counter when compare match occurs
The Basic Function Timer, BFTM, is a simple count-up 32-bit counter designed to measure time intervals and generate a one shot or repetitive interrupts. The BFTM can operate in two functional modes which are repetitive and one shot modes. In the repetitive mode the BFTM restarts the counter when a compare match event occurs. The BFTM also supports a one shot mode which will force the counter to stop counting when a compare match event occurs.
▆ Two 16-bit high resolution D/A converters with excellent frequency response characteristics and good power consumption for stereo audio output.
▆ Up to 16 simultaneous sounds
▆ 10-bit Volume Control
▆ Output sampling frequency up to 50 kHz
▆ Waveform data lengths of 8, 12 or 16 bits
▆ Stereo output
▆ Supports Repeat loop Play
▆ Supports PDMA interface
▆ 12-bit down counter with 3-bit prescaler
▆ Provides reset to the system
▆ Programmable watchdog timer window function
▆ Register write protection function
The Watchdog Timer, WDT, is a hardware timing circuit that can be used to detect system failures due to software trapped in a deadlock. It includes a 12-bit count-down counter, a prescaler, a WDT delta value register, WDT operation control circuitry and a WDT protection mechanism. If the software does not reload the counter value before a Watchdog Timer underflow occurs, a reset will be generated when the counter underflows. In addition, a reset is also generated if the software reloads the counter when the counter value is greater than the WDT delta value. It means that the counter must be reloaded within a limited timing window using a specific method. The Watchdog Timer counter can be stopped while the processor is in the debug mode. The register write protection function can be enabled to prevent an unexpected change in the Watchdog Timer configuration.
▆ 24-bit up-counter with a programmable prescaler
▆ Alarm function
▆ Interrupt and Wake-up event
Low Speed Timer, LSTM, circuitry includes the APB interface, a 24-bit up-counter, a control register, a prescaler, a compare register and a status register. The LSTM circuits are located in the VDD power domain. When the device enters the power-saving mode, the LSTM counter is used as a wakeup timer to let the system resume from the power saving mode.
▆ Supports both master and slave modes with a frequency of up to 1 MHz
▆ Provides an arbitration function and clock synchronization
▆ Supports 7-bit and 10-bit addressing modes and general call addressing
▆ Supports slave multi-addressing mode using address mask function
The I2 C is an internal circuit allowing communication with an external I2 C interface which is an industry standard two-wire serial interface used for connection to external hardware. These two serial lines are known as a serial data line, SDA, and a serial clock line, SCL. The I2 C module provides three data transfer rates: 100 kHz in the Standard mode, 400 kHz in the Fast mode and 1 MHz in the Fast plus mode. The SCL period generation register is used to setup different kinds of duty cycle implementations for the SCL pulse.
The SDA line which is connected directly to the I2 C bus is a bidirectional data line between the master and slave devices and is used for data transmission and reception. The I2 C also has an arbitration detect function and clock synchronization function to prevent situations where more than one master attempts to transmit data to the I2 C bus at the same time.
▆ Supports both master and slave mode
▆ Frequency of up to (fPCLK/2) MHz for the master mode and (fPCLK/3) MHz for the slave mode
▆ FIFO Depth: 8 levels
▆ Multi-master and multi-slave operation
The Serial Peripheral Interface, SPI, provides an SPI protocol data transmit and receive function in both master and slave modes. The SPI interface uses 4 pins, among which are the serial data input and output lines MISO and MOSI, the clock line, SCK, and the slave select line, SEL. One SPI device acts as a master device which controls the data flow using the SEL and SCK signals to indicate the start of data communication and the data sampling rate. To receive the data bits, the streamlined data bits are latched on a specific clock edge and stored in the data register or in the RX FIFO. Data transmission is carried out in a similar way with the reverse sequence. The mode fault detection provides a capability for multi-master applications.
▆ Supports both master and slave modes
▆ Master mode speed up to fHCLK/2
▆ Slave mode speed up to fHCLK/3
▆ Programmable data frame length up to 16 bits
▆ FIFO Depth: 8 levels
▆ MSB or LSB first shift selection
▆ Programmable slave select high or low active polarity
▆ Multi-master and multi-slave operation
▆ Master mode supports the dual/quad output read mode of QSPI series NOR Flash
▆ Four error flags with individual interrupt
● Read overrun
● Write collision
● Mode fault
● Slave abort
▆ Supports PDMA interface
The Quad Serial Peripheral Interface, QSPI, provides an SPI protocol data transmit and receive functions in both master and slave modes. The QSPI interface uses 6 pins for Dual/Quad SPI, among which are serial data input and output lines SIO3, SIO2, MISO/SIO1 and MOSI/SIO0, the clock line SCK, and the slave select line SEL.
▆ Asynchronous serial communication operating baud rate clock frequency up to fPCLK/16 MHz
▆ Full duplex communication
▆ Fully programmable serial communication characteristics including:
● Word length: 7, 8 or 9-bit character
● Parity: Even, odd or no-parity bit generation and detection
● Stop bit: 1 or 2 stop bit generation
● Bit order: LSB-first or MSB-first transfer
▆ Error detection: Parity, overrun and frame error
The Universal Asynchronous Receiver Transceiver, UART, provides a flexible full duplex data exchange using asynchronous transfer. The UART is used to translate data between parallel and serial interfaces, and is commonly used for RS232 standard communication. The UART peripheral function supports Line Status Interrupt. The software can detect a UART error status by reading UART Status & Interrupt Flag Register, URSIFR. The status includes the type and the condition of transfer operations as well as several error conditions resulting from Parity, Overrun, Framing and Break events.
▆ Supports CRC16 polynomial: 0x8005, X16 + X15 + X2 + 1
▆ Supports CCITT CRC16 polynomial: 0x1021, X16 + X12 + X5 + 1
▆ Supports IEEE-802.3 CRC32 polynomial: 0x04C11DB7, X32 + X26 + X23 + X22 + X16 + X12 + X11 + X10 + X8 + X7 + X5 + X4 + X2 + X + 1
▆ Supports 1's complement, byte reverse & bit reverse operation on data and checksum
▆ Supports byte, half-word & word data size
▆ Programmable CRC initial seed value
▆ CRC computation executed in 1 AHB clock cycle for 8-bit data and 4 AHB clock cycles for 32-bit data
▆ Supports PDMA to complete a CRC computation of a block of memory
The CRC calculation unit is an error detection technique test algorithm which is used to verify data transmission or storage data correctness. A CRC calculation takes a data stream or a block of data as its input and generates a 16-bit or 32-bit output remainder. Ordinarily, a data stream is suffixed by a CRC code and used as a checksum when being sent or stored. Therefore, the received or restored data stream is calculated by the same generator polynomial as described above. If the new CRC code result does not match the one calculated earlier, that means the data stream contains a data error.
▆ 6 channels with trigger source grouping
▆ 8-bit, 16-bit, 32-bit width data transfer
▆ Supports Linear address, circular address and fixed address modes
▆ 4-level programmable channel priority
▆ Auto reload mode
▆ Supports trigger source: ADC, SPI, QSPI, UART, I2 C, GPTM, MIDI Engine and software request
The Peripheral Direct Memory Access controller, PDMA, moves data between the peripherals and the system memory on the AHB bus. Each PDMA channel has a source address, destination address, block length and transfer count. The PDMA can exclude the CPU intervention and avoid interrupt service routine execution. It improves system performance as the software does not need to join each data movement operation.
▆ Full voltage range: 2.3 V ~ 3.6 V
▆ Serial Interface Architecture
▆ SPI compatible: Mode 0 and Mode 3
▆ 256 bytes per programmable page
▆ Standard, Dual or Quad SPI modes
▆ Low power consumption
▆ Uniform Sector Architecture
▆ Any sector or block can be erased individually
▆ Software and Hardware Reset
▆ Read Unique ID Number
The Flash data memory is a 16/32 Mbits Serial Flash memory, with advanced write protection mechanisms. The devices support the single bit and four bits serial input and output commands via standard Serial Peripheral Interface signals: Serial Clock, Chip Select, Serial DI(DQ0) and DO(DQ1), DQ2 and DQ3. The memory can be programmed 1 to 256 bytes each time, using the Page Program instruction.
The devices also offer a sophisticated method for protecting individual blocks against erroneous or malicious program and erase operations. By providing the ability to individually protect and unprotect blocks, a system can unprotect a specific block to modify its contents while keeping the remaining blocks of the memory array securely protected.
▆ Serial Wire Debug Port – SW-DP
▆ 4 comparators for hardware breakpoint or code / literal patch
▆ 2 comparators for hardware watch points
▆ 48 / 64-pin LQFP package
▆ Operation temperature range: -40 °C to 85 °C
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