MC9S12XD256MAL - 16-bit 256KB Flash HCS12X MCU 112-LQFP | NXP
MPN: MC9S12XD256MAL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $26.96 | $26.96 |
| 10 | $24.32 | $243.20 |
| 100 | $21.55 | $2,155.00 |
| 500 | $19.1 | $9,550.00 |
| 1,000 | $17.85 | $17,850.00 |
MC9S12XD256MAL Overview
An HCS12X MCU is a 16-bit CISC microcontroller that extends the classic HCS12 architecture with an XGATE auxiliary co-processor for high-bandwidth peripheral handling. It belongs to the automotive/industrial MCU family within the broader microcontroller hierarchy: MCU -> embedded processor -> semiconductor. HCS12X parts are upward-compatible with the HCS12 instruction set while adding enhanced indexed addressing, an instruction queue, and interrupt stacking that matches the HCS12 programmer's model. According to the NXP product page, the device targets automotive body and chassis applications as well as industrial control systems requiring deterministic real-time response.
Key features include 80MHz CPU clock, 256KB on-chip Flash, 4KB EEPROM for data retention, 12KB SRAM, five CAN modules (msCAN), an 8-channel 16-bit timer, 8-channel PWM, two SPI, two I2C, and three SCI/UART interfaces. The integrated 16-channel 12-bit ADC with 2.5 µs conversion supports analog sensor reading common in automotive ECUs.
The MC9S12XD256MAL uses Freescale/NXP's 0.18 µm embedded Flash process with on-chip voltage regulator for single 5V supply operation. The XGATE RISC co-processor offloads interrupt-driven peripheral servicing, freeing the main CPU for computation tasks. The device includes background debug mode (BDM) and a standard JTAG interface for in-circuit emulation.
Typical applications include automotive body controllers, instrument clusters, HVAC controllers, and industrial automation controllers. A common use case is motor-driven HVAC flap control with CAN-based diagnostic reporting, where deterministic interrupt response and multi-channel ADC are essential.
For new designs, evaluate whether the S12XE or S12XHY family members, with their enhanced XGATE and higher density RAM/Flash, offer cost advantages over the S12XD. Where ISO 26262 functional-safety compliance is required, the S12XFE or Cortex-M based parts must be considered instead.
This page synthesizes distributor pricing, drop-in alternatives, and design notes drawn from NXP application notes that the manufacturer's product page does not consolidate in one place.
Drop-in alternatives for MC9S12XD256MAL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC9S12XD256MAL (same form factor and footprint) — differing in Operating Temperature, Package, Supply Voltage, Core Processor, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12XDP512MAL
✅ Drop-In✓ In Stock
$16.4 / Unit
View Datasheet →MC9S12XDT256MAL
✅ Drop-In✓ In Stock
$15.85 / Unit
View Datasheet →MC9S12XD256CAL
✅ Drop-In✓ In Stock
$17.2 / Unit
View Datasheet →MC9S12XDT512MAL
✅ Drop-In✓ In Stock
$14.2 / Unit
View Datasheet →MC9S12XA256CAL
✅ Drop-In✓ In Stock
$26.91 / Unit
View Datasheet →MC9S12XET256MAL
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12XD256MAL Maximum Ratings & Electrical Characteristics
| Core | HCS12X (CISC, 16-bit) |
| CPU Clock Speed | 80 MHz |
| Program Memory | 256 KB Flash |
| RAM | 12 KB |
| EEPROM | 4 KB |
| Supply Voltage | 2.35 V to 2.75 V (core) / 5 V (I/O tolerant) |
| Operating Temperature | -40 °C to +125 °C (automotive grade) |
| Co-processor | XGATE RISC, 200 MHz equivalent |
| I/O Ports | 119 |
| ADC | 16-channel, 12-bit, 2.5 µs conversion |
| CAN | 5 x msCAN modules |
| PWM | 8-channel |
| Timers | 8-channel 16-bit |
| SPI | 2 |
| I2C | 2 |
| SCI/UART | 3 |
| Package | 112-LQFP (20 x 20 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Automotive |
| RoHS Status | Compliant |
MC9S12XD256MAL Pin Configuration
| Pin 1 | PE0/XADDR19 — Port E bit 0 / Extended address 19 |
| Pin 20 | PM0 — Port M bit 0 (general I/O or timer) |
| Pin 30 | VSSR — Voltage supply return (ground) |
| Pin 40 | PAD8 — Port AD bit 8 (digital or analog input) |
| Pin 50 | PT1 — Port T bit 1 (timer channel 1) |
| Pin 60 | PP1 — Port P bit 1 (PWM channel 1) |
| Pin 70 | PB0 — Port B bit 0 (general I/O) |
| Pin 80 | PS1 — Port S bit 1 (SPI / SCI) |
| Pin 90 | PC0 — Port C bit 0 (general I/O / CAN) |
| Pin 100 | PJ0 — Port J bit 0 (general I/O) |
| Pin 112 | VDD — Digital supply (5V external / 2.5V internal regulated) |
Typical Applications
MC9S12XD256MAL is suitable for 6 applications: Automotive Body Control Module, Instrument Cluster Controller, HVAC Climate Control Module, Industrial CAN Gateway, Automotive Seat/Mirror Controller, Battery Management Slave Controller.
Automotive Body Control Module
The MC9S12XD256MAL fits body control modules because it integrates five msCAN channels, 119 I/O, and 256 KB Flash, enabling body-domain networks without an external CAN transceiver MCU. Body control typically aggregates door, lighting, seat, and mirror nodes. With XGATE offloading, the main CPU handles CAN message filtering and dimming logic while keeping interrupt latency under 1 µs for safety-relevant responses such as brake-light signaling. The 80 MHz HCS12X core executes state-machine logic in 5-10 ms, well below the 20 ms CAN frame period.
Recommended
Instrument Cluster Controller
Instrument clusters require a fast MCU with PWM for backlight and gauge dimming, plus 12-bit ADC for fuel/coolant sensing. The MC9S12XD256MAL provides 8 PWM channels, 16 ADC channels, and 80 MHz bus clock, making it a strong fit. At 80 MHz the XGATE co-processor handles end-of-frame CAN bus arbitration while the main CPU drives the gauge-sweep PWM. This dual-core operation reduces cluster refresh jitter, which would otherwise cause visible pointer flicker at low PWM duty cycles.
Recommended
HVAC Climate Control Module
HVAC modules use multiple stepper or DC motor outputs, temperature sensors, and CAN connectivity to other vehicle systems. The MC9S12XD256MAL drives up to eight DC motor PWM channels directly, with the XGATE managing quadrature encoder interrupts. Compared to discrete MCU + motor-driver solutions, the integrated peripheral set reduces BOM by 3-5 components. The 4 KB EEPROM stores user preference settings; the 12 KB RAM supports a small RTOS or bare-metal scheduler.
Recommended
Industrial CAN Gateway
A CAN gateway bridges two or more CAN buses using the same CAN protocol across different baud rates or physical layers. The five msCAN channels of the MC9S12XD256MAL allow simultaneous bridging of up to four CAN buses plus a diagnostic bus, in a single MCU. With XGATE offloading, the firmware can implement routing tables with <1 ms latency per message. This topology is common in machine-to-machine gateways on factory floors where determinism is essential.
Recommended
Automotive Seat/Mirror Controller
Seat and mirror controllers use multiple brushed DC motors with current sensing, plus LIN or CAN connectivity. The MC9S12XD256MAL supports up to 8 PWM channels for motor control and 16 ADC channels for current and position feedback. The XGATE co-processor ensures PWM and ADC interrupts are serviced within 1 µs, even while the main CPU handles a higher-level CAN command stream. The 256 KB Flash accommodates calibration tables for multi-axis seat position memory.
Recommended
Battery Management Slave Controller
In a distributed battery management system, each cell-grouping slave monitors voltage and temperature. The MC9S12XD256MAL's 16-channel 12-bit ADC handles up to 16 cell-voltage readings, while the msCAN bus connects back to a master battery management controller. With XGATE offloading the ADC conversion-complete interrupts, the main CPU can focus on balancing decisions and SOH calculations. The 256 KB Flash fits basic coulomb-counting and lookup-table algorithms.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12XD256MAL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12XDP512MAL | MC9S12XDT256MAL | MC9S12XDT512MAL | MC9S12XA256CAL |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 112-LQFP (20x20) | 112-LQFP (20x20) - same | 112-LQFP (20x20) - same | 112-LQFP (20x20) - same | 112-LQFP (20x20) - same |
| Flash Memory | 256 KB | 512 KB | 256 KB | 512 KB | 256 KB |
| CPU Clock | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 40 MHz |
| XGATE Co-processor | Yes (200 MHz equiv.) | Yes | Yes | Yes | No |
| CAN Modules | 5 x msCAN | 5 x msCAN | 5 x msCAN | 5 x msCAN | 4 x msCAN |
| Temperature Grade | Automotive -40 to +125 C | Automotive | Automotive | Automotive | Commercial 0-70 C |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
Key Differentiators
- Highest CAN count and XGATE co-processor for the family (vs MC9S12XA256CAL)
- Drop-in upgrade path to 512KB Flash (vs MC9S12XDP512MAL)
- Automotive AEC-Q100 qualification in automotive-grade tier (vs MC9S12XD256CAL)
Design Notes
The MC9S12XD256MAL integrates an on-chip 2.5 V regulator; supply it from a single external 5 V rail with a 1 µF + 100 nF decoupling network at the VDD pin. Add bulk capacitance on VDDR (regulator output) per NXP AN2554. Operating the MCU with VDD outside 4.5-5.5 V will trigger the integrated low-voltage reset (LVR) and may cause Flash programming errors.
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of each VDD pin pair (the LQFP-112 has multiple VDD/VDDR pins); for analog VDD (VDDA), add a separate ferrite-bead filter. The NXP S12XD reference manual recommends a 4-layer PCB with continuous ground plane under the MCU, especially around the XTAL pins, to reduce EMI susceptibility of the PLL.
Do not enable XGATE before configuring PLL and clocks first; the XGATE runs at 200 MHz equivalent from the same PLL and an unconfigured PLL will cause XGATE code to execute against a default bus clock. Always initialize COP (computer operating properly) watchdog with a suitable timeout: 1.024 ms minimum for normal firmware startup. Refer to NXP application note AN2584 for CAN bus configuration sequence.
Compliance Information
AEC-Q100 qualified per automotive 'M' suffix temperature grade. RoHS/REACH compliant per NXP product page.
