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Single-Chip Low Pin-Count Microcontrollers Realizes Multiple Motor Control (Under Development)

TOKYO–Toshiba Corporation's (TOKYO: 6502) Storage & Electronic Devices Solutions Company today announced that it has developed a new group of microcontrollers, "M4K group" that allow a single-chip with a low pin-count (32 to 64 pins) to control multiple motors. The M4K group is the second offering in Toshiba’s TXZ™ family of high-speed, low power consumption microcontrollers that incorporate the Arm® Cortex®-M core, and sample shipments will start in October, 2016.

As energy saving regulations are gradually tightened and products continue to be miniaturized, demand is increasing for microcontrollers (MCUs) with low pin-count that can efficiently control multiple motors.

The new products meet requirements for the motor control systems of home appliances, such as air-conditioners, and are based on the Arm® Cortex®-M4 with FPU, which incorporates a floating point processing unit. Integrated features include a high-precision AD convertor with a 0.5 μs conversion speed, high-speed Flash memory with 80 MHz operation, and a co-processor for Toshiba’s original vector engine. Together, they ensure the new products realize efficient motor control while improving the power factor and system control.

The new products support the RAMScope interface, which can confirm parameters in real time without stopping motors, by loading parameters relevant to motor control to RAM. A self-diagnostic function that confirms the reference voltage of the AD convertor, and a CRC arithmetic circuit that detects incorrect detection for every read operation of the memory are also incorporated and contribute to load mitigation of the software process required for functional safety[1].

[1]: Compliant with the International Electrotechnical Commission’s (IEC) IEC 60730 standard.

* Arm and Cortex are registered trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
* All other company names, product names, and service names mentioned herein may be trademarks of their respective companies.


  • Two motors can be controlled with a 64-pin package.
    Until now, driving two motors required a product[2] with a 100-pin type package. Now, the TXZ family products with 64-pin type package can control two motors, because the AD convertor for detecting motor positions is accelerated and a 0.5 μs conversion speed is realized.
  • Providing solutions for driving motors more simply
    Driving motors can be easily realized by providing solutions such as sample software using built-in hardware resources (the advanced vector engine plus, (A-VE+), a high-speed AD convertor, and an advanced programmable motor control circuit (A-PMD)) for realizing the vector control and the power supply control.
  • The package line-up supports reductions in the size of circuit boards used for products such as home appliances.
    Provide various line-ups of low pin-count (32 pins to 64 pins) and small Flash memory (64 KB to 128 KB) products.
    Products with a wide pitch for flow mounting and a fine pitch for reflow mounting are included in the line-up.

[2]: “M370 group” products in Toshiba microcontrollers for motor control


Appliances with a motor control system
(Air-conditioners, washing machines, refrigerators, ventilation fans, ceiling fans, electric bicycles, etc.)

Part Naming Conventions

Example  (M4K group)

Part Naming Conventions

TXZ Family M4K group Pin count - Memory size lineup

TXZ Family M4K group Pin count - Memory size lineup


Series Name / Product Group TXZ4 Series / M4K Group
CPU Arm Cortex-M4 with FPU
Maximum Operating Frequency 80MHz
Internal Oscillator 10MHz(±1%)
Internal Memory Flash (code) 64K to 128KB
Flash (data)  -
RAM 18K to 26KB
with parity bits
I/O Port 24 to 52
CRC Arithmetic Circuit (CRC) 1 channel
Communication UART 2 to 4 channels
TSPI 1 to 4 channels
I2C 0 to 1 channels
12-bit AD Convertor (ADC) Input Channel 8 to 13 channels
Conversion Time 0.5μs
Operational Amplifier 3 channels (available gain selection)
Advanced Programmable Motor Control Circuit (A-PMD) 2 channels 
  - 3-phase complementation output: Resolution: 12.5ns, Duty = 15 bits
  - PFC Control: 3-phase interleave PFC supported
  - Scram function by an external input
Advanced Vector Engine Plus (A-VE+) 1 channel
 - Coprocessor for a vector control operation, coordinated operation
     with ADC/A-PMD
 - Expansion control of 1 shunt current detection area
 - Dead time compensation control, no-interactive control
Advanced Encoder (A-ENC) 1 channel
Timer 32 bit: 6 channels
16-bit timer × 2 channels: 12 channels
Watchdog Timer (WDT) 1 channel
Operating Temperature -40 to +105degC
Operating Voltage Range 4.5 to 5.5V
Pin Count 32 to 64 pins

Development Environment

Click "Development Environment TX Family / TXZ Family" for information on TXZ4 Series development environment products.

Evaluation Board

Customers can check the functional features on the evaluation board through the actual operation.
After mass production has started, evaluation boards are sold by the partners.
Before public selling, provides a sample version as one of sales expansion items.
For more information about a board, please refer to Toshiba Global Sales.

Application Notes / Sample Programs

Sample programs including CMSIS-compliant header/drivers will soon be available.
These sample programs will contain project files that can run on IAR Embedded Workbench (manufactured by IAR Systems) and MDK-Arm (Arm Co., Ltd.); therefore you can check the operation of your program as soon as you start a project.
An application note for the M4K group products, describing the details of the function sample programs and the usage, will be published.
For details, please contact Toshiba sales representatives.


Please refer to Toshiba Global Sales.



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