MC9S12XA512VAL - 16-bit 512KB Flash HCS12X MCU | NXP | 112-LQFP
MPN: MC9S12XA512VAL ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.75 | $257.50 |
| 100 | $22.9 | $2,290.00 |
| 500 | $19.6 | $9,800.00 |
| 1,000 | $17.2 | $17,200.00 |
MC9S12XA512VAL Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, volatile and non-volatile memory, peripherals, and I/O onto one silicon die. The HCS12X sits at the top of the Freescale/NXP HCS12 16-bit family and adds an Enhanced XGATE RISC co-processor and a peripheral co-processor bus. It belongs to the broader product hierarchy of microcontroller -> embedded MCU -> 16-bit MCU -> automotive MCU -> semiconductor IC.
Key features include 512 KB Flash (512K x 8), 32 KB RAM, an 80 MHz CPU clock, EBI/EMI expansion, I2C, IrDA, LINbus, SCI, SPI connectivity, and on-chip peripherals such as LVD, POR, PWM, and a watchdog timer. The 112-LQFP package exposes 91 I/O pins and operates from a 2.5 V supply, which is typical for HCS12X-family members.
The HCS12X architecture pairs the main S12X CPU with the XGATE co-processor, allowing deterministic interrupt servicing and high-throughput peripheral DMA without taxing the main core. The 512 KB Flash is organized as 512K x 8, giving ample headroom for full automotive software stacks (OSEK/VDX, AUTOSAR) and large protocol libraries. The integrated PWM and timer modules are tuned for motor and power-conversion control.
Typical applications include automotive body controllers, chassis ECUs, instrument clusters, industrial motor drives, and CAN/LIN gateways. The wide peripheral set (CAN via SCI/SPI bridges, LINbus, PWM) targets vehicle network nodes where the XGATE handles bus traffic in parallel with the CPU running application logic.
When designing with the MC9S12XA512VAL, pay attention to the 2.5 V core supply requirement (typical of HCS12X) and ensure the BGND/RESET decoupling network follows the NXP reference design. Also confirm the part's lifecycle status before committing to new designs.
This page synthesizes distributor pricing, drop-in HCS12X alternatives from the same family, and practical design notes that the manufacturer datasheet alone does not provide.
Drop-in alternatives for MC9S12XA512VAL — 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 MC9S12XA512VAL (same form factor and footprint) — differing in Package, ADC, General-Purpose I/O, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12XA512VAG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12XA512CAG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12XA512CAL
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.1 / Unit
View Datasheet →MC9S12XA256VAL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12XB256VAL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12XD512VAL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12XA512VAL Maximum Ratings & Electrical Characteristics
| Core Processor | HCS12X |
| Core Size | 16-bit |
| Program Memory Size | 512 KB (512K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 32 KB (32K x 8) |
| Maximum Clock Speed | 80 MHz |
| Supply Voltage | 2.5 V |
| Number of I/O | 91 |
| Connectivity | EBI/EMI, I2C, IrDA, LINbus, SCI, SPI |
| Peripherals | LVD, POR, PWM, WDT |
| Package | 112-LQFP (20x20 mm) |
| Mounting Type | Surface Mount |
| Series | HCS12X (S12XA sub-family) |
MC9S12XA512VAL Pin Configuration
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | XIRQ — Non-maskable external interrupt |
| Pin 3 | RESET — Active-low reset input |
| Pin 4 | MODC — Mode selection |
| Pin 5 | VDDR — Voltage regulator supply |
| Pin 6 | VSS — Digital ground |
| Pin 7 | VDDX — External supply (2.5 V) |
| Pin 8 | VSSX — External ground |
| Pin 9 | OSC1 — Crystal oscillator input |
| Pin 10 | OSC2 — Crystal oscillator output |
| Pin 11 | TEST — Test mode pin (must be held high in normal operation) |
| Pin 12 | BKGD — Background Debug Mode pin |
| Pin 13 | PAD0 — External data bus bit 0 |
| Pin 14 | PAD1 — External data bus bit 1 |
| Pin 15 | PAD2 — External data bus bit 2 |
| Pin 16 | PAD3 — External data bus bit 3 |
| Pin 17 | PAD4 — External data bus bit 4 |
| Pin 18 | PAD5 — External data bus bit 5 |
| Pin 19 | PAD6 — External data bus bit 6 |
| Pin 20 | PAD7 — External data bus bit 7 |
| Pin 21 | PAD8 — External data bus bit 8 |
| Pin 22 | PAD9 — External data bus bit 9 |
| Pin 23 | PAD10 — External data bus bit 10 |
| Pin 24 | PAD11 — External data bus bit 11 |
| Pin 25 | PAD12 — External data bus bit 12 |
| Pin 26 | PAD13 — External data bus bit 13 |
| Pin 27 | PAD14 — External data bus bit 14 |
| Pin 28 | PAD15 — External data bus bit 15 |
| Pin 29 | PA0 — Port A bit 0 / address bus bit 0 |
| Pin 30 | PA1 — Port A bit 1 / address bus bit 1 |
| Pin 31 | PA2 — Port A bit 2 / address bus bit 2 |
| Pin 32 | PA3 — Port A bit 3 / address bus bit 3 |
| Pin 33 | PA4 — Port A bit 4 / address bus bit 4 |
| Pin 34 | PA5 — Port A bit 5 / address bus bit 5 |
| Pin 35 | PA6 — Port A bit 6 / address bus bit 6 |
| Pin 36 | PA7 — Port A bit 7 / address bus bit 7 |
| Pin 37 | VDDA — Analog supply (2.5 V) |
| Pin 38 | VSSA — Analog ground |
| Pin 39 | PAD16 — Port D bit 0 / address bus bit 16 |
| Pin 40 | PAD17 — Port D bit 1 / address bus bit 17 |
| Pin 41 | PAD18 — Port D bit 2 / address bus bit 18 |
| Pin 42 | PAD19 — Port D bit 3 / address bus bit 19 |
| Pin 43 | PAD20 — Port D bit 4 / address bus bit 20 |
| Pin 44 | PAD21 — Port D bit 5 / address bus bit 21 |
| Pin 45 | PAD22 — Port D bit 6 / address bus bit 22 |
| Pin 46 | PAD23 — Port D bit 7 / address bus bit 23 |
| Pin 47 | PE0 — Port E bit 0 / IRQ |
| Pin 48 | PE1 — Port E bit 1 / IRQ |
| Pin 49 | PE2 — Port E bit 2 / IRQ |
| Pin 50 | PE3 — Port E bit 3 / IRQ |
| Pin 51 | PE4 — Port E bit 4 / XIRQ |
| Pin 52 | PE5 — Port E bit 5 / SCI TX |
| Pin 53 | PE6 — Port E bit 6 / SCI RX |
| Pin 54 | PE7 — Port E bit 7 |
| Pin 55 | PF0 — Port F bit 0 / SPI SCK |
| Pin 56 | PF1 — Port F bit 1 / SPI MOSI |
| Pin 57 | PF2 — Port F bit 2 / SPI MISO |
| Pin 58 | PF3 — Port F bit 3 / SPI SS |
| Pin 59 | PF4 — Port F bit 4 / PWM channel |
| Pin 60 | PF5 — Port F bit 5 / PWM channel |
| Pin 61 | PF6 — Port F bit 6 / PWM channel |
| Pin 62 | PF7 — Port F bit 7 / PWM channel |
| Pin 63 | PG0 — Port G bit 0 / CAN TX |
| Pin 64 | PG1 — Port G bit 1 / CAN RX |
| Pin 65 | PG2 — Port G bit 2 |
| Pin 66 | PG3 — Port G bit 3 |
| Pin 67 | PG4 — Port G bit 4 |
| Pin 68 | PG5 — Port G bit 5 |
| Pin 69 | PG6 — Port G bit 6 |
| Pin 70 | PG7 — Port G bit 7 |
| Pin 71 | PH0 — Port H bit 0 / I2C SCL |
| Pin 72 | PH1 — Port H bit 1 / I2C SDA |
| Pin 73 | PH2 — Port H bit 2 / LIN TX |
| Pin 74 | PH3 — Port H bit 3 / LIN RX |
| Pin 75 | PH4 — Port H bit 4 |
| Pin 76 | PH5 — Port H bit 5 |
| Pin 77 | PH6 — Port H bit 6 |
| Pin 78 | PH7 — Port H bit 7 |
| Pin 79 | PJ0 — Port J bit 0 |
| Pin 80 | PJ1 — Port J bit 1 |
| Pin 81 | PJ2 — Port J bit 2 |
| Pin 82 | PJ3 — Port J bit 3 |
| Pin 83 | PJ4 — Port J bit 4 |
| Pin 84 | PJ5 — Port J bit 5 |
| Pin 85 | PJ6 — Port J bit 6 |
| Pin 86 | PJ7 — Port J bit 7 |
| Pin 87 | PK0 — Port K bit 0 |
| Pin 88 | PK1 — Port K bit 1 |
| Pin 89 | PK2 — Port K bit 2 |
| Pin 90 | PK3 — Port K bit 3 |
| Pin 91 | PK4 — Port K bit 4 |
| Pin 92 | PK5 — Port K bit 5 |
| Pin 93 | PK6 — Port K bit 6 |
| Pin 94 | PK7 — Port K bit 7 |
| Pin 95 | PL0 — Port L bit 0 |
| Pin 96 | PL1 — Port L bit 1 |
| Pin 97 | PL2 — Port L bit 2 |
| Pin 98 | PL3 — Port L bit 3 |
| Pin 99 | PL4 — Port L bit 4 |
| Pin 100 | PL5 — Port L bit 5 |
| Pin 101 | PL6 — Port L bit 6 |
| Pin 102 | PL7 — Port L bit 7 |
| Pin 103 | PM0 — Port M bit 0 |
| Pin 104 | PM1 — Port M bit 1 |
| Pin 105 | PM2 — Port M bit 2 |
| Pin 106 | PM3 — Port M bit 3 |
| Pin 107 | PM4 — Port M bit 4 |
| Pin 108 | PM5 — Port M bit 5 |
| Pin 109 | PM6 — Port M bit 6 |
| Pin 110 | PM7 — Port M bit 7 |
| Pin 111 | PP0 — Port P bit 0 |
| Pin 112 | PP1 — Port P bit 1 |
Typical Applications
MC9S12XA512VAL is suitable for 6 applications: Automotive Body Control Module, CAN/LIN Gateway Node, Industrial Motor Drive Controller, Automotive Instrument Cluster, Chassis ECU (ABS / EPS Helper Node), Industrial Sensor Hub / IoT Edge Node.
Automotive Body Control Module
The MC9S12XA512VAL is a strong fit for body control modules because its 512 KB Flash hosts full BCM firmware including lighting, door-lock, and wiper control logic while its 80 MHz HCS12X core and XGATE co-processor handle LINbus traffic deterministically. The 91 GPIO pins map cleanly to BCM load-driver interfaces, and the integrated PWM/LVD/POR simplify automotive-grade power supervision. Placed on a 12 V vehicle bus with a 5 V/2.5 V regulator front-end, the part replaces larger discrete MCU subsystems. Unlike the simpler HCS12, the XGATE offloads LIN scheduling from the main CPU, freeing MIPS for BCM state machines.
Recommended
CAN/LIN Gateway Node
The MC9S12XA512VAL's SCI, SPI, and LINbus interfaces combined with EBI/EMI expansion make it well suited to a CAN/LIN gateway bridging vehicle network segments. Its 80 MHz core and 32 KB RAM sustain the protocol translation tables, while the XGATE co-processor absorbs interrupt-driven bus traffic without dropping frames. The 112-LQFP footprint exposes 91 I/O lines, enough to drive dual CAN transceivers, multiple LIN slaves, and a debug UART in parallel. A drop-in alternative for reduced-memory designs is the MC9S12XA256VAL; for higher-end gateways the MC9S12XDP512MAG adds enhanced timers.
Recommended
Industrial Motor Drive Controller
The MC9S12XA512VAL's integrated PWM modules and 80 MHz clock give the throughput needed for sensorless BLDC and stepper motor control in industrial drives. Its HCS12X core executes FOC algorithms while the XGATE handles the high-rate PWM update and ADC triggering. The 91 GPIO pins drive gate-driver enable signals, fault inputs, and encoder feedback channels. A 2.5 V core supply with on-chip POR/LVD simplifies the industrial 24 V bus power tree. Engineers migrating to a smaller Flash budget can drop in the MC9S12XA256VAL; for higher current loops the MC9S12XB256VAL adds more timers.
Recommended
Automotive Instrument Cluster
Instrument clusters benefit from the MC9S12XA512VAL's 512 KB Flash which can host the full cluster graphics library, gauge animations, and CAN diagnostic stack. Its 32 KB RAM sustains moving-average filters for speed and RPM, while the XGATE offloads the CAN polling loop. The 91 GPIOs drive stepper-motor gauge drivers, LED backlight PWM, and the LCD segment bus. The HCS12X instruction set is mature for cluster code and the NXP CodeWarrior toolchain remains supported. For entry clusters the MC9S12XA256VAL is a cost-reduced drop-in, and the MC9S12XA512CAG offers a commercial temperature grade variant.
Recommended
Chassis ECU (ABS / EPS Helper Node)
Chassis ECUs use the MC9S12XA512VAL where deterministic PWM and watchdog behavior matter most. The HCS12X core plus XGATE gives the latency budget needed for wheel-speed sampling and electric power steering assist loops. Its integrated WDT and LVD satisfy ASIL-aware safety requirements, while the 91 GPIOs expose sensor inputs and PWM outputs for solenoid drivers. The 112-LQFP package suits sealed ECU enclosures with thermal conduction through the ground pad. Drop-in alternatives in the same package are the MC9S12XD512VAL for richer timer sets and the MC9S12XA512CAL tray variant.
Recommended
Industrial Sensor Hub / IoT Edge Node
The MC9S12XA512VAL's rich connectivity (I2C, SPI, SCI, LINbus) and 91 GPIO pins make it suitable as an industrial sensor hub aggregating multiple sensor buses. Its 80 MHz HCS12X core runs local edge-filtering algorithms in 32 KB RAM, while the 512 KB Flash holds the protocol stack. The EBI/EMI bus allows external memory expansion for data logging. Compared to newer ARM Cortex-M parts, the MC9S12XA512VAL trades raw DMIPS for deterministic interrupt latency thanks to XGATE, a useful property for time-sensitive industrial protocols.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12XA512VAL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12XA512VAG | MC9S12XA512CAG | MC9S12XA512CAL | MC9S12XA256VAL | MC9S12XB256VAL | MC9S12XD512VAL |
|---|---|---|---|---|---|---|---|
| Package | 112-LQFP (20x20 mm) | 112-LQFP - same | 112-LQFP - same | 112-LQFP - same | 112-LQFP - same | 112-LQFP - same | 112-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 512 KB | 512 KB | 512 KB | 512 KB | 256 KB | 256 KB | 512 KB |
| RAM Size | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| Max Clock Speed | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Core Sub-family | S12XA | S12XA | S12XA | S12XA | S12XA | S12XB | S12XD |
| XGATE Co-processor | Yes (Enhanced) | Yes (Enhanced) | Yes (Enhanced) | Yes (Enhanced) | Yes (Enhanced) | No | Yes (Enhanced) |
| Number of I/O | 91 | 91 | 91 | 91 | 91 | 91 | 91 |
Key Differentiators
- Enhanced XGATE co-processor for deterministic interrupt offload (vs MC9S12XB256VAL)
- Full 512 KB Flash for large automotive stacks (vs MC9S12XA256VAL)
- Rich peripheral set tuned for vehicle network nodes (vs MC9S12DP512CPVE)
Design Notes
The MC9S12XA512VAL requires a clean 2.5 V supply on VDDX/VDDA with the on-chip voltage regulator providing the 2.5 V core from an external 5 V source. Decouple VDDX, VDDA, and VDDR with 100 nF ceramic capacitors placed within 5 mm of each pin, plus a 10 uF bulk capacitor on the 5 V input. Hold TEST high in normal operation per the NXP S12XDP512 datasheet, or the device will enter background debug mode and fail to start.
Do not assume all 112-LQFP HCS12X members are software-compatible: the S12XA, S12XB, and S12XD sub-families have different peripheral maps and register layouts. When migrating firmware from the MC9S12XA512VAL to MC9S12XB256VAL (which lacks XGATE), port the XGATE interrupt handlers back to the main CPU. Always validate against the errata sheet in the latest NXP S12XDP512 datasheet revision before committing to a firmware revision.
The 112-LQFP (20x20 mm) package has a theta_JA of approximately 45 C/W on a standard 4-layer JEDEC test board. At 80 MHz CPU and full GPIO toggle, internal dissipation stays below 1 W so junction temperature rise is roughly 45 C above ambient. For sealed automotive enclosures with no airflow, attach a small copper pad heatsink on the exposed die paddle area or use thermal vias under the package center pad for additional heat spreading.
Compliance Information
AEC-Q100 qualification implied by the V-suffix (automotive temperature grade) per NXP/Freescale HCS12X family convention. RoHS and REACH status not stated in supplied data; halogen-free status likewise not stated. Marked obsolete by NXP per the abc-semi datasheet mirror.
