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NXP Semiconductors MC9S12XDT256VAA
- Part No.:
- MC9S12XDT256VAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12XDT256VAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,635
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Product details
Overview
MC9S12XDT256VAA from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a dual-core architecture with S12X CPU and XGATE coprocessor, 256 KB on-chip Flash, 14 KB RAM, and integrated CAN 2.0B, SPI, IIC, SCI, PWM, ATD, and ECT peripherals. It operates at up to 50 MHz core frequency with 3.3 V supply and supports automotive-grade temperature range (−40°C to +105°C).
For engineers reviewing the MC9S12XDT256VAA datasheet, MC9S12XDT256VAA pinout, MC9S12XDT256VAA application, or MC9S12XDT256VAA equivalent, key selection criteria include XGATE offload capability for real-time signal processing, dual CAN interface support, 10-bit 16-channel ATD with external trigger inputs, and maskset-specific memory mapping for deterministic timing in engine control and chassis modules.
Technical Context
The MC9S12XDT256VAA implements the S12X CPU core with enhanced addressing modes and instruction set, coupled with an independent XGATE RISC coprocessor for autonomous peripheral handling. Its memory subsystem includes 256 KB Flash (organized as two 128 KB banks), 14 KB RAM (8 KB general-purpose + 6 KB XGATE-only), and 2 KB EEPROM - all supporting background programming and security protection.
Peripherals are tightly synchronized via the XCLK clock domain and managed through dedicated interrupt vectors and priority arbitration. The device supports multiple low-power modes (WAIT, STOP, FREEZE) with selective module gating, and integrates a voltage regulator (S12VREG3V3V5) for internal 3.3 V generation from 5 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | S12X 16-bit CPU + XGATE 16-bit RISC coprocessor for parallel peripheral management |
| Max Core Frequency | 50 MHz - enables sub-μs interrupt latency and real-time control loop execution |
| Flash Memory | 256 KB - supports dual-bank operation for safe over-the-air updates without runtime interruption |
| RAM | 14 KB total (8 KB CPU-accessible + 6 KB XGATE-exclusive) - isolates real-time tasks from main firmware |
| ADC Resolution & Channels | 10-bit, 16-channel ATD with 4 external trigger inputs - suitable for multi-sensor engine monitoring |
| CAN Interfaces | Two independent MSCAN modules compliant with ISO 11898-1:2003 - enables redundant vehicle networks or gateway functionality |
| Operating Temperature | −40°C to +105°C - qualified for under-hood automotive applications per AEC-Q100 Grade 2 |
| Supply Voltage | 5.0 V ±10% main supply; internal 3.3 V regulator - simplifies power design in 5 V automotive systems |
Pinout & Package
MC9S12XDT256VAA is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions follow S12XD family standard layout, including dedicated CANH/CANL differential pairs, dual crystal oscillator inputs (EXTAL/XTAL), and multiplexed I/O grouped by port (Port A–T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power and ground | Supports 5 V ±10% supply; requires local decoupling per AVDD/DVDD domains |
| EXTAL / XTAL | Clock oscillator input/output | Drives Pierce oscillator for primary system clock; supports 4–32 MHz crystals |
| CAN0H / CAN0L | CAN 2.0B differential bus lines | Direct connection to physical transceiver; supports 1 Mbit/s data rate |
| CAN1H / CAN1L | Second CAN 2.0B differential bus lines | Independent from CAN0; enables dual-network topology or diagnostic isolation |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; compatible with external watchdog signals |
| MODA / MODB | Mode select inputs | Configure boot mode (Normal, Special Bootstrap, Background Debug) at power-on |
Key Features
| Feature | Design Value |
|---|---|
| XGATE coprocessor | Offloads time-critical tasks (e.g., CAN message filtering, ADC post-processing) from main CPU, reducing jitter in control loops |
| Dual CAN 2.0B controllers | Enables simultaneous communication on two isolated vehicle networks - essential for body/gateway or redundancy architectures |
| 16-channel 10-bit ATD with 4 external triggers | Allows synchronized sampling across multiple sensors (e.g., throttle, pedal, manifold pressure) using hardware event triggers |
| Background Debug Module (BDM) | Enables non-intrusive debugging and flash programming via single-wire interface - critical for production calibration |
| Memory security (S12X9SECV2) | Prevents unauthorized read-out of Flash/EEPROM contents via BDM or COP reset sequences - meets OEM security requirements |
| Enhanced Capture Timer (ECT) | 8-channel input capture/output compare with quadrature decoding - supports precise motor position sensing and RPM measurement |
Applications
| Engine Control Unit (ECU) | Chassis Control Module |
|---|---|
Use Scenario: Real-time fuel injection timing, spark advance calculation, and knock detection using analog sensor inputs and crank/cam position signals. IC Role / Device Role / Timing Role: Primary controller executing closed-loop combustion algorithms with sub-10 μs interrupt response and deterministic XGATE-managed ADC sampling. Use Value: Dual CAN interfaces enable communication with transmission and body controllers; 256 KB Flash accommodates complex calibration maps and diagnostics. | Use Scenario: Active suspension control using accelerometer and wheel speed data, with torque vectoring commands sent to inverter modules. IC Role / Device Role / Timing Role: High-integrity motion controller managing ECT-based wheel speed capture, PWM-driven valve actuation, and CAN-based actuator feedback. Use Value: −40°C to +105°C rating ensures reliability in under-vehicle environments; XGATE handles sensor fusion independently of main control loop. |
| Body Control Gateway | Electric Power Steering (EPS) |
Use Scenario: Aggregating LIN and CAN messages between lighting, door, and HVAC subsystems while performing gateway routing and diagnostics. IC Role / Device Role / Timing Role: Protocol translator and message router with dual CAN ports and configurable I/O for discrete switch/sensor interfacing. Use Value: 14 KB RAM provides buffer space for concurrent message queues; BDM support enables field firmware updates without disassembly. | Use Scenario: Torque assist computation using steering angle, torque sensor, and vehicle speed inputs, with safety-critical fail-safe PWM outputs to motor drivers. IC Role / Device Role / Timing Role: ASIL-B capable controller executing torque calculation, fault monitoring, and redundant PWM generation with hardware dead-time insertion. Use Value: Integrated voltage regulator eliminates need for external 3.3 V LDO; memory security prevents tampering with assist maps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XDP512VAA | 512 KB Flash, 32 KB RAM, same pinout and peripheral set - higher memory capacity for complex AUTOSAR stacks | Targeted at high-end ECUs requiring larger OS footprint and extended diagnostics | Select when >256 KB Flash is needed for software-defined features or future scalability |
| S912XEQ512J2MAG | NXP S12XE derivative with 512 KB Flash, enhanced ECT, and improved CAN FD readiness - not pin-compatible | Designed for next-generation chassis systems needing higher resolution timers and expanded CAN bandwidth | Choose for new designs targeting CAN FD migration path; requires PCB redesign |
Compared with MC9S12XDT256VAA, the MC9S12XDP512VAA offers double Flash/RAM for scalable software but shares identical timing behavior and debug infrastructure, while the S912XEQ512J2MAG introduces architectural enhancements that improve real-time determinism but necessitate full hardware requalification.
Availability
MC9S12XDT256VAA is available at Aetrix Electronics and suitable for engine control units, chassis control modules, and body control gateways requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for MC9S12XDT256VAA 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in automotive microcontrollers dating back to Motorola and Freescale.
The MC9S12XDT256VAA belongs to the HCS12X family, designed specifically for cost-sensitive, high-reliability automotive applications where deterministic real-time performance, functional safety compliance, and long-term supply stability are mandatory.
FAQ
What is the maximum operating frequency of the MC9S12XDT256VAA?
The MC9S12XDT256VAA supports a maximum core frequency of 50 MHz, achieved via its phase-locked loop (PLL) clock generator. This frequency enables sub-microsecond interrupt response times and supports real-time control loops in engine and chassis applications. The actual achievable frequency depends on external crystal selection (4–32 MHz), PLL configuration, and board-level signal integrity. All timing specifications in the datasheet assume operation at this rated maximum.
Does the MC9S12XDT256VAA support CAN FD?
No, the MC9S12XDT256VAA does not support CAN FD. It integrates two legacy MSCAN modules compliant only with ISO 11898-1:2003 (Classical CAN 2.0B), supporting data rates up to 1 Mbit/s with 11-bit identifiers. CAN FD capability was introduced in later NXP families such as S32K and S12XE. For CAN FD requirements, consider migrating to the S912XEQ512J2MAG or newer S32K144 series, which require hardware and software redesign.
How much XGATE-specific RAM is allocated in the MC9S12XDT256VAA?
The MC9S12XDT256VAA allocates 6 KB of dedicated RAM exclusively accessible by the XGATE coprocessor. This memory is physically separate from the 8 KB general-purpose RAM used by the S12X CPU and cannot be accessed by the main core. It is mapped into the XGATE address space starting at 0x2000 and is used for XGATE code execution, stack operations, and data buffers - enabling true hardware-isolated real-time task execution without CPU contention.
What packaging and thermal characteristics apply to the MC9S12XDT256VAA?
The MC9S12XDT256VAA is supplied in a 112-pin LQFP package (16 mm × 16 mm, 0.4 mm pitch) with an exposed thermal pad. Its thermal resistance (θJA) is 32°C/W under JEDEC JESD51-7 conditions, and it is rated for operation from −40°C to +105°C ambient temperature. The device meets AEC-Q100 Grade 2 qualification, making it suitable for under-hood automotive environments where sustained high-temperature reliability is required.
Is the MC9S12XDT256VAA supported by modern development tools?
Yes, the MC9S12XDT256VAA is supported by NXP's legacy toolchain including CodeWarrior Development Studio for HCS12(X) and S32DS for S12X (discontinued but still distributable). While no longer actively developed, these tools retain full debug, flash programming, and peripheral configuration capabilities for the MC9S12XDT256VAA. Third-party IDEs like Eclipse-based S32DS and open-source GCC ports also provide partial support, though XGATE assembly optimization and BDM integration may require legacy tool dependencies.
MC9S12XDT256VAA 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XDT256VAA FAQ
1.How can I place an order for MC9S12XDT256VAA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XDT256VAA 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 MC9S12XDT256VAA reliable?
The price and inventory of MC9S12XDT256VAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XDT256VAA is usually 5 days.
3.What payment methods are accepted for MC9S12XDT256VAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XDT256VAA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XDT256VAA?
MC9S12XDT256VAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XDT256VAA 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 MC9S12XDT256VAA?
For technical support, including MC9S12XDT256VAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XDT256VAA requirements.
6.How does Aetrix verify that MC9S12XDT256VAA is sourced from the original manufacturer or authorized distributors?
All MC9S12XDT256VAA 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 MC9S12XDT256VAA meets industry standards.
7.What is the process for return or replacement of MC9S12XDT256VAA?
All MC9S12XDT256VAA units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XDT256VAA, 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 MC9S12XDT256VAA part is unused and in its original packaging.
Return procedure for MC9S12XDT256VAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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