The **M3H55TAG-R** belongs to the **M3H Group** of the TXZ+™ Family Advanced Class microcontrollers developed by **Toshiba**. These are high-performance ARM® Cortex®-M3 microcontrollers designed primarily for motor control and industrial automation. --- ### 1. Key Technical Specifications Below is a breakdown of the core electronic specifications for this specific part: | Feature | Specification | | :--- | :--- | | **Core** | ARM® Cortex®-M3 | | **Max Operating Frequency** | 120 MHz | | **Flash Memory** | 128 KB | | **RAM** | 12 KB | | **Operating Voltage** | 2.7V to 5.5V | | **Package Type** | TQFP64 (10mm x 10mm) | | **Operating Temperature** | -40°C to 85°C | --- ### 2. Core Electronic Subsystems The M3H55TAG-R integrates several specialized hardware blocks that make it suitable for precision control: #### A. Analog-to-Digital Converter (ADC) * **Resolution:** 12-bit. * **Speed:** High-speed conversion (approx. 1.0 $\mu$s). * **Function:** Crucial for reading sensor data, such as current and voltage feedback in motor systems. #### B. Advanced Programmable Motor Control (A-PMD) * Contains a 3-phase PWM output circuit. * Supports dead-time insertion to prevent short circuits in power MOSFETs/IGBTs. * Synchronizes directly with the ADC to ensure current measurements are taken at the correct point in the PWM cycle. #### C. Communication Interfaces * **UART:** For serial communication. * **I2C:** For peripheral sensor communication. * **TSPI:** High-speed serial peripheral interface. --- ### 3. Safety and Reliability Features Designed for industrial environments, the part includes several "robustness" features: * **Clock Gear:** Allows for independent frequency settings for different peripheral blocks. * **Watchdog Timer (WDT):** Monitors software execution and resets the chip if a hang occurs. * **LVD (Low Voltage Detection):** Triggers an interrupt or reset if the supply voltage drops below a safe threshold. --- ### 4. Part Number Decoder Understanding the "M3H55TAG-R" nomenclature: * **M3H:** Group name (Cortex-M3, High speed). * **5:** Memory size indicator (128KB Flash). * **5:** Pin count indicator (64-pin). * **T:** Package type (TQFP). * **A:** Functional variant. * **G:** RoHs/Halogen-free compliance. * **-R:** Indicates "Tape and Reel" packaging for automated assembly. ---