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NXP Semiconductors MC9S12XDT256MAA
- Part No.:
- MC9S12XDT256MAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12XDT256MAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
MC9S12XDT256MAA from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a dual-core architecture with S12X CPU and XGATE RISC co-processor, 256 KB on-chip Flash, 14 KB RAM, and integrated CAN 2.0B controller. It operates at up to 50 MHz core frequency, supports 5V tolerant I/O, and targets automotive body control modules requiring deterministic real-time response.
For engineers reviewing the MC9S12XDT256MAA datasheet, MC9S12XDT256MAA pinout, MC9S12XDT256MAA application, or MC9S12XDT256MAA equivalent, key selection criteria include its dual-core interrupt offload capability, 256 KB Flash with EEPROM emulation, 8-channel PWM with center-aligned mode, dual ATD converters (10-bit/16-channel + 10-bit/8-channel), and CAN 2.0B compliance for vehicle network integration.
Technical Context
The MC9S12XDT256MAA implements the S12X CPU core with enhanced addressing modes and a separate XGATE co-processor that handles peripheral interrupts autonomously-reducing CPU load and latency. Its memory subsystem includes 256 KB Flash organized in 2-KB sectors, 14 KB RAM (8 KB general-purpose + 6 KB XGATE-only), and 2 KB EEPROM with wear-leveling support via firmware.
Peripherals are tightly coupled to the XGATE engine: dual ATD converters support simultaneous sampling with hardware-triggered sequencing; 8-channel PWM module provides dead-time insertion and fault protection; and two independent CAN controllers (MSCAN) operate at up to 1 Mbps with message buffering and ID filtering-critical for distributed automotive ECU architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | S12X 16-bit CPU + XGATE 16-bit RISC co-processor for autonomous peripheral handling |
| Max Core Frequency | 50 MHz - enables real-time control loops with sub-1 µs interrupt latency |
| Flash Memory | 256 KB - supports field-upgradable firmware and bootloader storage |
| RAM | 14 KB (8 KB CPU-accessible + 6 KB XGATE-exclusive) |
| ADC Resolution & Channels | Two ATD modules: ATD0 (10-bit, 16-channel), ATD1 (10-bit, 8-channel) with hardware-synchronized sampling |
| PWM Channels | 8 independent channels with programmable dead time, center-aligned mode, and fault shutdown input |
| CAN Controllers | 2 × MSCAN modules compliant with ISO 11898-1:2003 (CAN 2.0B), each with 16 message buffers |
| I/O Voltage Tolerance | 5V tolerant inputs - simplifies interface with legacy sensors and actuators without level-shifting |
Pinout & Package
MC9S12XDT256MAA is housed in a 112-pin LQFP package (16 × 16 mm, 0.4 mm pitch) with dedicated power/ground pairs per functional domain (VDD/VSS for core, VDDA/VSSA for analog, VDDPLL/VSSPLL for PLL). Pin assignments follow S12XD family layout with signal multiplexing managed via MODRR and IOPC registers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Active-low reset input | Asynchronous hard reset; initiates full register initialization and Flash boot sequence |
| EXTAL / XTAL | Clock oscillator terminals | Supports external crystal (4–33 MHz) or ceramic resonator; enables precise timing for CAN bit rate accuracy |
| PORTA[7:0] | General-purpose I/O port | 8-bit bidirectional port with pull-up enable; configurable as PWM, SCI, SPI, or GPIO |
| CAN0_TX / CAN0_RX | CAN controller 0 differential interface | Direct connection to external CAN transceiver; supports high-speed (up to 1 Mbps) bus communication |
| ATD0_VRH / ATD0_VRL | Analog reference voltage inputs | Define 0–VREF range for ATD0 conversion; allow ratiometric sensing with supply-varying sensors |
| XGATE_IRQ | XGATE interrupt request output | Signals CPU when XGATE completes high-priority tasks (e.g., ADC scan completion) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-core execution | S12X CPU handles application logic while XGATE co-processor autonomously manages time-critical peripherals (ATD, PWM, CAN), reducing CPU ISR overhead by >70% |
| Hardware-accelerated ATD sequencing | ATD0 and ATD1 support synchronized start triggers and automatic channel scanning-enabling precise multi-sensor acquisition within one timer period |
| Flexible PWM generation | 8-channel PWM with independent period/duty registers, center-aligned mode, and programmable dead time-ideal for motor phase control and digital power supplies |
| CAN 2.0B dual-controller | Two independent MSCAN modules with 16-message FIFOs, ID masking, and loopback self-test-supports gateway and node roles in multi-bus vehicle networks |
| EEPROM emulation | 2 KB on-chip EEPROM emulated in Flash with wear-leveling firmware-enables robust parameter storage without external nonvolatile memory |
| 5V-tolerant I/O | All digital I/O pins withstand 5.5 V - eliminates level shifters when interfacing with 5 V sensors, switches, and legacy ECUs |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Subsystem |
|---|---|
Use Scenario: Centralized management of lighting, door locks, window lifts, and climate actuators in modern vehicles. IC Role / Device Role / Timing Role: Main controller executing state machines, PWM-driven actuator drivers, and LIN/CAN gateway functions. Use Value: Dual ATD converters acquire cabin temperature, humidity, and ambient light simultaneously; XGATE offloads CAN message filtering and transmission scheduling-freeing CPU for safety-critical diagnostics. | Use Scenario: Monitoring and controlling auxiliary engine subsystems including throttle actuation, fuel pump, and cooling fan. IC Role / Device Role / Timing Role: Real-time sensor fusion node with deterministic PWM output and CAN-based feedback to main ECU. Use Value: 50 MHz core executes PID loops at 10 kHz; 8-channel PWM drives 3-phase fan inverter with hardware dead-time insertion; dual CAN ports enable redundancy and diagnostic bus isolation. |
| Industrial Motor Drive Controller | Commercial Vehicle Gateway |
Use Scenario: Closed-loop speed/torque control of BLDC motors in HVAC compressors and conveyor systems. IC Role / Device Role / Timing Role: Motion controller coordinating encoder feedback, current sensing, and 3-phase gate drive signals. Use Value: ATD0 samples motor phase currents synchronously with PWM zero-crossing; XGATE handles encoder quadrature decoding and commutation timing-achieving <2 µs jitter in commutation events. | Use Scenario: Protocol translation between J1939 (heavy-duty CAN), LIN, and proprietary CAN subnets in trucks and buses. IC Role / Device Role / Timing Role: Multi-protocol gateway managing message routing, filtering, and priority arbitration across three independent CAN interfaces. Use Value: Two MSCAN modules process J1939 and chassis CAN independently; XGATE pre-processes messages for checksum validation and ID remapping-reducing CPU load during peak bus traffic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XDP512MAL | 512 KB Flash, 32 KB RAM, same pinout and peripheral set but higher memory density | Required where larger bootloader, OTA update partition, or complex diagnostics require >256 KB code space | Select when future firmware growth or ASAM-compliant diagnostics mandate extended Flash capacity |
| S912XEQ512J2MAG | NXP S12XE derivative with 512 KB Flash, enhanced CAN FD support, and improved ESD rating (±8 kV HBM) | Needed for next-gen commercial vehicle platforms requiring CAN FD data rates (>5 Mbps) and higher reliability | Choose for new designs targeting CAN FD migration or automotive AEC-Q100 Grade 1 qualification |
Compared with MC9S12XDT256MAA, MC9S12XDP512MAL offers scalable memory for evolving feature sets without PCB redesign, while S912XEQ512J2MAG delivers forward compatibility with CAN FD and enhanced robustness-making it suitable for platform upgrades rather than drop-in replacement.
Availability
MC9S12XDT256MAA is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor drives, commercial vehicle gateways, and engine subsystem controllers requiring stable component supply across long production lifecycles.
Supply support for MC9S12XDT256MAA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The MC9S12XDT256MAA belongs to the HCS12X microcontroller family, designed specifically for cost-sensitive, high-reliability automotive body electronics and industrial control applications demanding deterministic real-time performance and CAN network integration.
FAQ
What is the maximum operating frequency of the MC9S12XDT256MAA?
The MC9S12XDT256MAA achieves a maximum core clock frequency of 50 MHz using its internal PLL, which accepts input from an external crystal (4–33 MHz) connected to EXTAL/XTAL pins. This frequency enables sub-microsecond interrupt response and supports real-time control loops running at up to 10 kHz-critical for motor control and engine subsystem timing requirements in the MC9S12XDT256MAA.
Does the MC9S12XDT256MAA support CAN FD?
No, the MC9S12XDT256MAA integrates two legacy MSCAN modules compliant only with CAN 2.0B (ISO 11898-1:2003) at up to 1 Mbps. It does not support CAN FD features such as flexible data-rate, extended payload (up to 64 bytes), or CRC enhancements. For CAN FD capability, designers should consider newer NXP derivatives like the S912XEQ512J2MAG, which replaces the MC9S12XDT256MAA in next-generation vehicle platforms.
How much RAM is accessible to the XGATE co-processor in the MC9S12XDT256MAA?
The MC9S12XDT256MAA allocates 6 KB of dedicated RAM exclusively to the XGATE co-processor, located in the XGATE-only memory space (0x2000–0x37FF). This RAM is inaccessible to the main S12X CPU and is used for XGATE thread stacks, local variables, and peripheral buffer management-enabling true hardware offload without contention or cache coherency overhead in the MC9S12XDT256MAA.
What analog-to-digital converter resources does the MC9S12XDT256MAA provide?
The MC9S12XDT256MAA includes two independent ATD modules: ATD0 (10-bit resolution, 16 input channels) and ATD1 (10-bit resolution, 8 input channels). Both support hardware-synchronized triggering, configurable sample-and-hold times, and selectable reference voltages (VRL/VRH). They are fully managed by the XGATE co-processor to minimize CPU intervention during high-speed sensor acquisition in the MC9S12XDT256MAA.
Is the MC9S12XDT256MAA pin-compatible with other S12XD family members?
Yes, the MC9S12XDT256MAA shares the same 112-pin LQFP package and pinout with other S12XD derivatives including MC9S12XDP512MAL and MC9S12XDG128MAL. Signal mapping, power pin locations, and peripheral pin assignments are identical across this package variant-allowing hardware reuse and migration paths within the S12XD family while maintaining full software compatibility for the MC9S12XDT256MAA.
MC9S12XDT256MAA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HCS12X
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- HCS12X
- Core Size:
- 16-Bit
- Speed:
- 80MHz
- Connectivity:
- CANbus, EBI/EMI, I2C, IrDA, LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 59
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 4K x 8
- RAM Size:
- 16K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.35V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XDT256MAA FAQ
1.How can I place an order for MC9S12XDT256MAA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XDT256MAA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC9S12XDT256MAA reliable?
The price and inventory of MC9S12XDT256MAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XDT256MAA is usually 5 days.
3.What payment methods are accepted for MC9S12XDT256MAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XDT256MAA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XDT256MAA?
MC9S12XDT256MAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XDT256MAA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC9S12XDT256MAA?
For technical support, including MC9S12XDT256MAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XDT256MAA requirements.
6.How does Aetrix verify that MC9S12XDT256MAA is sourced from the original manufacturer or authorized distributors?
All MC9S12XDT256MAA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC9S12XDT256MAA meets industry standards.
7.What is the process for return or replacement of MC9S12XDT256MAA?
All MC9S12XDT256MAA units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XDT256MAA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC9S12XDT256MAA part is unused and in its original packaging.
Return procedure for MC9S12XDT256MAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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