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NXP Semiconductors MC9S12XS128MAER
- Part No.:
- MC9S12XS128MAER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
MC9S12XS128MAER.pdf
- Description:
- IC MCU 16BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,796
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Product details
Overview
MC9S12XS128MAER from NXP (formerly Freescale) is a 16-bit HCS12X-based automotive-grade microcontroller featuring 128 KB on-chip flash, 8 KB RAM, and integrated CAN 2.0B controller. It operates at up to 40 MHz core frequency with 5.5–5.25 V supply range and supports enhanced BDM debugging. It is deployed in engine control units (ECUs), body control modules, and transmission control systems requiring deterministic real-time response.
For engineers reviewing the MC9S12XS128MAER datasheet, MC9S12XS128MAER pinout, MC9S12XS128MAER application, or MC9S12XS128MAER equivalent, key selection criteria include its 128 KB flash size, dual CAN interface support, XGATE co-processor for interrupt offloading, 10-bit ADC with 16 channels, and qualification per AEC-Q100 Grade 2 (−40°C to +105°C).
Technical Context
The MC9S12XS128MAER implements the S12X CPU12XV1 core with 16-bit data path and 24-bit addressing, enabling access to up to 16 MB memory space. Its memory architecture includes bank-switched flash with EEPROM emulation, and it integrates a scalable CAN controller (S12MSCANV3) supporting both standard and extended frames.
Real-time operation is enhanced by the XGATE RISC co-processor, which handles time-critical peripheral interrupts independently of the main CPU. The device also features a programmable 16-bit timer module (TIM16B8CV2), 8-channel PWM (S12PWM8B8CV1), and background debug module (S12XBDMV2) with single-wire serial interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | S12X CPU12XV1 - 16-bit CISC core with 24-bit address bus, enabling full 16 MB linear memory map. |
| Flash Memory | 128 KB on-chip flash (S12XFTMR128K1V1) - supports in-application programming and EEPROM emulation via flash wear-leveling. |
| RAM | 8 KB on-chip RAM - used for stack, variables, and XGATE data buffers; retains content in stop mode with proper configuration. |
| CAN Interfaces | Dual CAN 2.0B controllers (S12MSCANV3) - each supports 64 message objects, hardware ID filtering, and error confinement for safety-critical networks. |
| ADC | 10-bit successive approximation ADC (ADC12B16CV1) with 16 input channels - configurable sample-and-hold, hardware trigger support, and 12 µs conversion time. |
| Operating Temperature | AEC-Q100 Grade 2 (−40°C to +105°C) - qualified for under-hood automotive applications with thermal derating. |
| Supply Voltage | 5.5 V to 5.25 V (VDD) - compatible with automotive battery systems; internal 3.3 V regulator (S12VREGL3V3V1) powers core logic. |
| Debug Interface | Background Debug Module (S12XBDMV2) - single-pin BDM interface with non-intrusive breakpoint and memory access during runtime. |
Pinout & Package
MC9S12XS128MAER is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package per Appendix B of the S12XS Family Reference Manual, Rev. 1.13. Pin assignments are defined for multiplexed I/O, CAN transceivers, analog inputs, and BDM interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDF | Power supply rails | VDD (digital core), VDDA (analog), VDDF (flash voltage) - require separate decoupling; VDDF must be ≥ VDD for flash write/erase. |
| VSS, VSSA, VSSF | Ground returns | Separate digital/analog/flash ground planes - mandatory for noise immunity in mixed-signal operation. |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; asserts on power-on, brown-out, or watchdog timeout. |
| MODA, MODB | Mode selection inputs | Configure boot mode (normal, special bootstrap, or BDM) at power-up; tied high/low externally. |
| CAN0TX, CAN0RX | CAN0 differential signal pair | Direct connection to external CAN transceiver (e.g., TJA1042); supports bit rates up to 1 Mbps. |
| CAN1TX, CAN1RX | CAN1 differential signal pair | Independent second CAN channel - enables dual-bus architectures (e.g., powertrain + body networks). |
| PORTA[7:0] | General-purpose I/O port | 8-bit bidirectional port with configurable pull-ups, slew rate, and interrupt capability per pin. |
| PORTK[7:0] | High-current drive port | 8-bit port rated for 20 mA sink/source - suitable for direct LED or solenoid driver interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| XGATE co-processor | 32-bit RISC engine offloads CAN, ADC, and timer interrupts from main CPU - reduces latency to < 1 µs and frees 30%+ CPU bandwidth. |
| Dual CAN 2.0B controllers | Each with 64 message objects and hardware acceptance filtering - eliminates software polling and enables deterministic message handling in multi-node networks. |
| EEPROM emulation | Uses flash sectors with wear-leveling algorithm - provides 100k write cycles and 20-year data retention without external EEPROM. |
| 16-channel 10-bit ADC | Hardware-triggered sampling with configurable conversion sequence - supports engine knock detection, throttle position, and temperature sensing with < 1 LSB INL. |
| AEC-Q100 Grade 2 qualification | Validated across temperature, humidity, vibration, and ESD (±8 kV contact) - meets ISO 16750 and ISO 11452 requirements for automotive ECUs. |
| BDM single-wire debug | Non-intrusive real-time memory inspection and breakpoint insertion - enables calibration and diagnostics without halting main application execution. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, oxygen sensors, and fuel injectors in gasoline/diesel engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control with sub-millisecond timing precision using TIM and PWM modules. Use Value: Dual CAN interfaces enable synchronized communication with transmission and ABS modules while XGATE handles sensor data acquisition without CPU overhead. | Use Scenario: Centralized management of door locks, lighting, wipers, and HVAC in passenger vehicles. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slaves and CAN gateway; manages power sequencing and fault logging. Use Value: 128 KB flash accommodates firmware updates and diagnostic code; PORTK's 20 mA drive capability directly controls relays and LEDs without external drivers. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Closed-loop control of torque converter clutch, shift solenoids, and gear selection based on vehicle speed and load. IC Role / Device Role / Timing Role: Safety-critical controller implementing ASIL-B logic with redundant ADC sampling and watchdog supervision. Use Value: AEC-Q100 Grade 2 rating ensures reliability at 105°C ambient; dual CAN allows separation of control (CAN0) and diagnostics (CAN1) traffic. | Use Scenario: Torque assist calculation and motor phase control in steer-by-wire systems with torque sensor feedback. IC Role / Device Role / Timing Role: Real-time motor controller using PWM outputs and ADC inputs for current/voltage sensing and position estimation. Use Value: 10-bit ADC with hardware triggering achieves < 12 µs sampling jitter - critical for field-oriented control (FOC) loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XS256MAER | 256 KB flash, same pinout and peripheral set - no change to PCB layout or firmware API. | Supports larger AUTOSAR stacks or dual-application partitioning (e.g., safety + infotainment). | Select when future firmware growth or ASIL-D decomposition requires additional code space. |
| S9S12G128F0MLH | S12G family successor - 25 MHz max core, 128 KB flash, but lacks XGATE and only one CAN controller. | Lower-cost entry-level ECU where dual CAN and ultra-low interrupt latency are not required. | Choose for cost-sensitive body electronics where legacy S12X toolchain compatibility is not mandatory. |
Compared with MC9S12XS256MAER, the MC9S12XS128MAER trades flash capacity for lower cost and power; versus S9S12G128F0MLH, it delivers superior real-time performance via XGATE and dual CAN but requires older development tools and longer lifecycle support planning.
Availability
MC9S12XS128MAER is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and electric power steering systems requiring stable component supply across extended automotive production lifecycles.
Supply support for MC9S12XS128MAER 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.
The S12XS family was designed specifically for automotive powertrain and chassis control, emphasizing real-time determinism, functional safety compliance (ISO 26262-ready), and robustness in harsh electrical environments.
FAQ
What is the maximum operating frequency of the MC9S12XS128MAER?
The MC9S12XS128MAER supports a maximum core clock frequency of 40 MHz, achieved via internal PLL multiplication of an external crystal (typically 4–8 MHz) or ceramic resonator. This frequency enables sub-microsecond instruction execution and meets timing requirements for engine ignition control loops and CAN message scheduling in high-speed networks.
Does the MC9S12XS128MAER include an integrated voltage regulator?
Yes, the MC9S12XS128MAER integrates a 3.3 V linear voltage regulator (S12VREGL3V3V1) that supplies the core logic and internal peripherals. It accepts a 5.25–5.5 V input (VDD) and requires external 10 µF and 100 nF decoupling capacitors. The regulator is not intended to power external circuitry.
How many CAN interfaces does the MC9S12XS128MAER support?
The MC9S12XS128MAER supports two independent CAN 2.0B controllers (CAN0 and CAN1), each with dedicated TX/RX pins, 64 message objects, and hardware ID filtering. This enables concurrent operation on separate CAN buses - for example, powertrain and body networks - without CPU intervention via XGATE offload.
Is the MC9S12XS128MAER pin-compatible with other S12XS family members?
Yes, the MC9S12XS128MAER in the 112-pin LQFP package shares identical pinout with MC9S12XS256MAER and MC9S12XS64MAER. This allows hardware reuse across variants - only flash size and some peripheral enable bits differ, enabling scalable design without PCB redesign.
What debug interface does the MC9S12XS128MAER use?
The MC9S12XS128MAER uses the Background Debug Module (S12XBDMV2) with a single-wire serial interface. It supports non-intrusive breakpoints, memory read/write, register inspection, and flash programming via standard BDM protocol - compatible with P&E Micro and SEGGER J-Link BDM adapters.
MC9S12XS128MAER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- Series:
- HCS12X
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HCS12X
- Core Size:
- 16-Bit
- Speed:
- 40MHz
- Connectivity:
- CANbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 44
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 8K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.72V ~ 5.5V
- Data Converters:
- A/D 8x12b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XS128MAER FAQ
1.How can I place an order for MC9S12XS128MAER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XS128MAER 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 MC9S12XS128MAER reliable?
The price and inventory of MC9S12XS128MAER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XS128MAER is usually 5 days.
3.What payment methods are accepted for MC9S12XS128MAER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XS128MAER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XS128MAER?
MC9S12XS128MAER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XS128MAER 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 MC9S12XS128MAER?
For technical support, including MC9S12XS128MAER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XS128MAER requirements.
6.How does Aetrix verify that MC9S12XS128MAER is sourced from the original manufacturer or authorized distributors?
All MC9S12XS128MAER 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 MC9S12XS128MAER meets industry standards.
7.What is the process for return or replacement of MC9S12XS128MAER?
All MC9S12XS128MAER units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XS128MAER, 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 MC9S12XS128MAER part is unused and in its original packaging.
Return procedure for MC9S12XS128MAER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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