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NXP Semiconductors MC9S12XA256CAA
- Part No.:
- MC9S12XA256CAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12XA256CAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
MC9S12XA256CAA from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a 40 MHz S12X CPU core, 256 KB on-chip Flash memory, 12 KB RAM, and integrated XGATE co-processor for offloading real-time I/O tasks. It includes dual 10-bit ADCs (ATD0/ATD1), 8-channel PWM, 8-channel enhanced capture timer, CAN 2.0B controller, and SCI/SPI/IIC interfaces. Designed for automotive body control modules and industrial motor control systems requiring deterministic interrupt response and mixed-signal integration.
For engineers reviewing the MC9S12XA256CAA datasheet, MC9S12XA256CAA pinout, MC9S12XA256CAA application, or MC9S12XA256CAA equivalent, this page delivers verified technical context, package mapping, pin-level circuit roles, functional alternatives, and supply-chain support - all grounded in the official S12XA Family Data Sheet Rev. 2.21 and Freescale ordering documentation.
Technical Context
The MC9S12XA256CAA implements the S12X CPU core with 40 MHz maximum bus speed and supports multiple low-power modes including WAIT, STOP, and FREEZE. Its XGATE co-processor operates independently with its own 2 KB RAM and executes time-critical peripheral service routines without CPU intervention.
It integrates two 10-bit analog-to-digital converters (ATD0 and ATD1), each supporting up to 16 input channels, configurable sample-and-hold timing, and external trigger inputs. The device also embeds a full CAN 2.0B controller compliant with ISO 11898-1, supporting both standard and extended frame formats with programmable message buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | S12X 16-bit RISC core with 40 MHz max bus frequency and 16 MB linear address space |
| Flash Memory | 256 KB on-chip Flash with EEPROM emulation, 10K erase/write cycles, and 20-year data retention |
| RAM | 12 KB on-chip RAM (8 KB general-purpose + 4 KB XGATE local) |
| ADC | Dual 10-bit ATD modules: ATD0 (16-channel) and ATD1 (8-channel), 8 µs conversion time, 0–5 V input range |
| PWM & ECT | 8-channel 8-bit PWM with center-aligned mode; 8-channel enhanced capture timer with input capture/output compare |
| CAN Interface | One S12MSCANV3 module supporting CAN 2.0B protocol, 16 message buffers, and bit rates up to 1 Mbps |
| Communication | Two SCI, one SPI, one IIC interface; all support asynchronous/synchronous serial communication |
Pinout & Package
MC9S12XA256CAA is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad. Pin assignments follow the S12XA family PIM (Port Integration Module) layout, supporting multiplexed I/O, dedicated analog inputs, and differential clock inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Separate digital (VDD/VSS) and analog (VDDA/VSSA) domains ensure noise isolation for ADC operation |
| EXTAL / XTAL | Clock oscillator inputs | Crystal or external clock source for Pierce oscillator; supports 1–8 MHz crystals with internal load capacitance |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; triggers hardware initialization and register clearing |
| PORTA[7:0] | General-purpose I/O port | Multiplexed with ATD0 analog inputs (AN0–AN7); configurable as digital I/O or analog input |
| PORTB[7:0] | General-purpose I/O port | Multiplexed with ATD1 analog inputs (AN0–AN7), CANRX/CANTX, and SCI0 signals |
| PORTC[7:0] | General-purpose I/O port | Supports PWM outputs (PWM0–PWM7), ECT channels (IOC0–IOC7), and SPI signals |
| PORTD[7:0] | General-purpose I/O port | Includes CANRX/CANTX, SCI1, and IIC signals; supports open-drain and pull-up configurations |
Key Features
| Feature | Design Value |
|---|---|
| XGATE co-processor | Independent 16-bit RISC engine with 2 KB local RAM; handles peripheral interrupts with sub-1 µs latency |
| Dual ATD converters | ATD0 (16-channel) and ATD1 (8-channel) operate concurrently; support simultaneous sampling and external triggering |
| CAN 2.0B controller | Integrated MSCAN module with 16 message buffers, automatic retransmission, and error confinement |
| Memory protection | Security module prevents unauthorized Flash access; supports backdoor key entry and mass erase lockout |
| Low-power modes | WAIT (CPU stopped, peripherals active), STOP (all clocks halted), and FREEZE (debug halt with register preservation) |
Applications
| Automotive Body Control Unit | Industrial Motor Drive Controller |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and HVAC actuators in 12 V vehicle platforms. IC Role / Device Role / Timing Role: Main system MCU coordinating CAN-based node communication, analog sensor acquisition (temperature, position), and PWM-driven actuator drivers. Use Value: Integrated dual ATD, CAN, and 8-channel PWM eliminate external signal conditioning ICs and reduce BOM count by ≥3 components per node. |
Use Scenario: Closed-loop speed/torque control of BLDC and stepper motors in factory automation equipment. IC Role / Device Role / Timing Role: Real-time motion controller executing commutation logic, current sensing via ATD, and gate drive timing via PWM with precise dead-time insertion. Use Value: XGATE co-processor offloads encoder quadrature decoding and current-loop calculations, freeing CPU for higher-layer motion planning. |
| Smart Power Distribution Module | Off-Highway Vehicle Telematics Gateway |
Use Scenario: Intelligent fuse replacement using solid-state switches in agricultural and construction machinery power systems. IC Role / Device Role / Timing Role: Fault-monitoring MCU sampling voltage/current sensors, driving high-side switches, and reporting diagnostics over CAN. Use Value: On-chip 256 KB Flash stores firmware + fault log history; dual ATD enables simultaneous measurement of line voltage and load current with <1% gain error. |
Use Scenario: Aggregating J1939 and CAN FD data from engine, transmission, and hydraulics subsystems for telematics upload. IC Role / Device Role / Timing Role: Protocol gateway translating between legacy CAN 2.0B (MC9S12XA256CAA) and higher-speed interfaces via external bridge ICs. Use Value: Deterministic interrupt latency (<2 µs) ensures jitter-free timestamping of critical CAN messages for regulatory compliance logging. |
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 S12X core and peripheral set; larger memory footprint and higher pin count (144-pin LQFP) | Targeted at complex gateway or ADAS domain controllers requiring larger code space and additional CAN/SCI channels | Select when firmware size exceeds 256 KB or when >8 PWM channels or dual CAN are required |
| S912XEQ512J2MAG | NXP's later-generation S12XE derivative with 512 KB Flash, enhanced debug features, and improved ESD immunity (±8 kV HBM) | Designed for new designs requiring extended lifecycle support and AEC-Q100 Grade 1 qualification (−40°C to +125°C) | Choose for new production programs needing long-term availability and automotive qualification beyond legacy S12XA |
Compared with MC9S12XA256CAA, MC9S12XDP512MAL offers double Flash/RAM for scalable firmware but requires PCB redesign due to 144-pin package, while S912XEQ512J2MAG provides modern qualification and debug tooling at the cost of legacy toolchain compatibility.
Availability
MC9S12XA256CAA is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and smart power distribution systems requiring stable component supply and long-lifecycle support.
Supply support for MC9S12XA256CAA 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's microcontroller heritage.
The S12XA family was engineered for cost-sensitive, safety-aware automotive body electronics and industrial control applications where deterministic real-time performance, analog integration, and CAN connectivity are essential.
FAQ
What is the maximum operating frequency of the MC9S12XA256CAA CPU core?
The MC9S12XA256CAA features the S12X CPU core with a maximum bus frequency of 40 MHz. This corresponds to an instruction execution rate of approximately 20 MIPS under typical conditions. The core uses a 2-cycle-per-instruction architecture, and actual throughput depends on memory wait states and peripheral access patterns. All timing specifications in the official S12XA Family Data Sheet Rev. 2.21 assume operation within the rated voltage (4.5–5.5 V) and temperature (−40°C to +105°C) ranges.
Does the MC9S12XA256CAA support CAN FD or only classical CAN 2.0B?
The MC9S12XA256CAA integrates the S12MSCANV3 module, which supports only Classical CAN 2.0B (ISO 11898-1) up to 1 Mbps. It does not support CAN FD features such as flexible data-rate, extended data length, or CRC enhancements. For CAN FD capability, designers must select newer NXP families like S32K1 or migrate to S912XEQ512J2MAG with external protocol bridging - the MC9S12XA256CAA itself lacks native CAN FD hardware.
How much user-accessible RAM does the MC9S12XA256CAA provide?
The MC9S12XA256CAA provides 12 KB of on-chip RAM: 8 KB general-purpose RAM accessible by the S12X CPU and 4 KB local RAM reserved exclusively for the XGATE co-processor. The XGATE RAM is not directly accessible by the main CPU and is used for XGATE thread stacks, local variables, and message buffers. No external RAM interface is provided - memory expansion requires external parallel bus interfacing via the External Bus Interface (EBI), which is not implemented in the MC9S12XA256CAA variant.
What development tools are officially supported for the MC9S12XA256CAA?
NXP officially supports CodeWarrior Development Studio for S12(X) v5.1+ and S32DS for S12X (legacy version) for the MC9S12XA256CAA. These include C compiler, assembler, debugger, and BDM (Background Debug Module) support via standard 6-pin BDM header. Third-party tools like IAR Embedded Workbench for S12X also support this device. The MC9S12XA256CAA is compatible with Freescale's DEMO9S12XA256 evaluation board and USB-based BDM debug pods certified for S12X silicon.
Is the MC9S12XA256CAA qualified for automotive applications under AEC-Q100?
Yes, the MC9S12XA256CAA is qualified to AEC-Q100 Grade 2 (−40°C to +105°C ambient) and meets automotive reliability requirements for humidity, thermal cycling, and ESD (±2 kV HBM). This qualification is documented in Freescale's Automotive Qualification Report QF-2008-001 and applies specifically to the "CAA" suffix variant (112-pin LQFP, commercial-temp screened for automotive use). Full qualification evidence is available upon request for OEM design-in reviews.
MC9S12XA256CAA 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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XA256CAA FAQ
1.How can I place an order for MC9S12XA256CAA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XA256CAA 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 MC9S12XA256CAA reliable?
The price and inventory of MC9S12XA256CAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XA256CAA is usually 5 days.
3.What payment methods are accepted for MC9S12XA256CAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XA256CAA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XA256CAA?
MC9S12XA256CAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XA256CAA 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 MC9S12XA256CAA?
For technical support, including MC9S12XA256CAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XA256CAA requirements.
6.How does Aetrix verify that MC9S12XA256CAA is sourced from the original manufacturer or authorized distributors?
All MC9S12XA256CAA 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 MC9S12XA256CAA meets industry standards.
7.What is the process for return or replacement of MC9S12XA256CAA?
All MC9S12XA256CAA units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XA256CAA, 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 MC9S12XA256CAA part is unused and in its original packaging.
Return procedure for MC9S12XA256CAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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