MC9S12XHZ256VAG - 16-bit MCU 256KB Flash 80MHz 144-LQFP | NXP
MPN: MC9S12XHZ256VAG ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.16 | $24.16 |
| 10 | $22.4 | $224.00 |
| 100 | $19.85 | $1,985.00 |
| 500 | $17.5 | $8,750.00 |
| 1,000 | $15.2 | $15,200.00 |
MC9S12XHZ256VAG Overview
What is an automotive instrumentation MCU? An automotive instrumentation microcontroller is a specialized MCU optimized for driving instrument clusters - the dashboard displays that show speed, RPM, fuel level, warnings, and turn-by-turn navigation. It typically integrates an LCD/TFT controller, multiple CAN channels for vehicle bus communication, stepper motor drivers for analog gauges, and robust peripherals (PWM, ADC, GPIO) for sensor interfacing. Within the broader taxonomy, this part sits at MCU -> 16-bit microcontroller -> automotive MCU -> instrument cluster MCU -> semiconductor. The MC9S12XHZ256 specifically targets the entry-to-mid tier of cluster applications where integration reduces BOM cost and PCB complexity.
Key features include 256KB Flash memory, 12KB RAM, four MSCAN (CAN 2.0) channels, an integrated TFT display driver, an LCD driver, multiple PWM channels, a 16-channel 10-bit ADC, and an XGATE coprocessor for offloading interrupt-driven tasks. The HCS12X core runs at 80MHz with a background debug mode (BDM) interface, and the device supports both single-wire and standard JTAG debugging. The on-chip TFT controller supports up to WVGA-class color panels.
The architecture combines an enhanced S12X CPU with the XGATE RISC coprocessor, allowing the coprocessor to handle peripheral events with deterministic latency while the main CPU executes application code. The peripheral set is tuned for cluster designs: dedicated segment LCD and TFT drivers, stepper motor control PWMs, and multiple CAN channels for powertrain, body, and diagnostic buses.
Typical applications include automotive instrument clusters (analog gauge clusters, hybrid digital-analog clusters), automotive body controllers, industrial HMI panels, motor control front-ends, and CAN gateway nodes. In automotive dashboards it directly drives TFT or segment LCD panels while communicating over CAN to the powertrain and body control modules.
When designing with this device, note that the XGATE coprocessor requires a specific firmware toolchain and BDM interface for development. Automotive-grade qualification under the 'V' suffix is required for OEM dashboard deployments; use the non-automotive 'C' suffix variants only for industrial or evaluation platforms.
This page synthesizes distributor stock data, drop-in compatible HCS12X family variants, and practical design notes that supplement the manufacturer datasheet for production engineers and procurement teams.
Drop-in alternatives for MC9S12XHZ256VAG — 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 MC9S12XHZ256VAG (same form factor and footprint) — differing in Package, Operating Temperature, Core Architecture, ADC, Temperature Grade.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12XHZ384VAG
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12XHZ512VAG
✅ Drop-In📋 Reference alternative (not in catalog)
S912XHZ384F1VAG
✅ Drop-In📋 Reference alternative (not in catalog)
S912XHZ512F1VAG
✅ Drop-In📋 Reference alternative (not in catalog)
S912XHZ256F1VAGR
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S12XHZ256VAG Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS12X (16-bit) |
| CPU Clock Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 12 KB |
| Package | 144-LQFP (20x20 mm) |
| Operating Temperature | -40C to +105C (Automotive) |
| Number of Pins | 144 |
| CAN Channels (MSCAN) | 4 |
| ADC | 16-channel, 10-bit |
| Display Controller | Integrated TFT driver + LCD driver |
| Coprocessor | XGATE RISC coprocessor |
| PWM Channels | 8 channels |
| Debug Interface | BDM (Background Debug Mode) + JTAG |
| Supply Voltage | 3.15 V to 5.5 V |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount (Gull Wing) |
| Temperature Grade | Automotive (VAG suffix) |
MC9S12XHZ256VAG Pin Configuration
| Pin 1 | VSS — Ground reference |
| Pin 2 | VDDR — Voltage regulator supply |
| Pin 3 | VDD1 — Core voltage supply (1.8V regulated) |
| Pin 4 | VDD2 — I/O voltage supply (5V) |
| Pin 5 | VSS — Ground |
| Pin 6 | RESET — External reset input, active low |
| Pin 7 | BKGD — Background Debug Mode (BDM) interface |
| Pin 8 | MODC — Mode select for BDM/JTAG |
| Pin 9 | TCLK — JTAG test clock |
| Pin 10 | TD I/O — JTAG test data input/output |
| Pin 11 | TMS — JTAG test mode select |
| Pin 12 | TRST — JTAG test reset |
| Pin 13 | TCK — JTAG test clock (alternate) |
| Pin 14 | CAN0TX — MSCAN0 transmit |
| Pin 15 | CAN0RX — MSCAN0 receive |
| Pin 16 | CAN1TX — MSCAN1 transmit |
| Pin 17 | CAN1RX — MSCAN1 receive |
| Pin 18 | CAN2TX — MSCAN2 transmit |
| Pin 19 | CAN2RX — MSCAN2 receive |
| Pin 20 | CAN3TX — MSCAN3 transmit |
| Pin 21 | CAN3RX — MSCAN3 receive |
| Pin 22 | PAD0 — GPIO/TFT data line |
| Pin 23 | PAD1 — GPIO/TFT data line |
| Pin 24 | PAD2 — GPIO/TFT data line |
| Pin 25 | PAD3 — GPIO/TFT data line |
| Pin 26 | PAD4 — GPIO/TFT data line |
| Pin 27 | PAD5 — GPIO/TFT data line |
| Pin 28 | PAD6 — GPIO/TFT data line |
| Pin 29 | PAD7 — GPIO/TFT data line |
| Pin 30 | PAD8 — GPIO/TFT data line |
| Pin 31 | PAD9 — GPIO/TFT data line |
| Pin 32 | PAD10 — GPIO/TFT data line |
| Pin 33 | PAD11 — GPIO/TFT data line |
| Pin 34 | PAD12 — GPIO/TFT data line |
| Pin 35 | PAD13 — GPIO/TFT data line |
| Pin 36 | PAD14 — GPIO/TFT data line |
| Pin 37 | PAD15 — GPIO/TFT data line |
| Pin 38 | PWM0 — Pulse-width modulator output 0 |
| Pin 39 | PWM1 — Pulse-width modulator output 1 |
| Pin 40 | PWM2 — Pulse-width modulator output 2 |
| Pin 41 | PWM3 — Pulse-width modulator output 3 |
| Pin 42 | PWM4 — Pulse-width modulator output 4 |
| Pin 43 | PWM5 — Pulse-width modulator output 5 |
| Pin 44 | PWM6 — Pulse-width modulator output 6 |
| Pin 45 | PWM7 — Pulse-width modulator output 7 |
| Pin 46 | AN0 — ADC analog input channel 0 |
| Pin 47 | AN1 — ADC analog input channel 1 |
| Pin 48 | AN2 — ADC analog input channel 2 |
| Pin 49 | AN3 — ADC analog input channel 3 |
| Pin 50 | AN4 — ADC analog input channel 4 |
| Pin 51 | AN5 — ADC analog input channel 5 |
| Pin 52 | AN6 — ADC analog input channel 6 |
| Pin 53 | AN7 — ADC analog input channel 7 |
| Pin 54 | AN8 — ADC analog input channel 8 |
| Pin 55 | AN9 — ADC analog input channel 9 |
| Pin 56 | AN10 — ADC analog input channel 10 |
| Pin 57 | AN11 — ADC analog input channel 11 |
| Pin 58 | AN12 — ADC analog input channel 12 |
| Pin 59 | AN13 — ADC analog input channel 13 |
| Pin 60 | AN14 — ADC analog input channel 14 |
| Pin 61 | AN15 — ADC analog input channel 15 |
| Pin 62 | VRH — ADC high reference voltage |
| Pin 63 | VRL — ADC low reference voltage |
| Pin 64 | VSSA — Analog ground |
| Pin 65 | VDDA — Analog supply voltage |
| Pin 66 | TFT_CLK — TFT display clock output |
| Pin 67 | TFT_HSYNC — TFT horizontal sync |
| Pin 68 | TFT_VSYNC — TFT vertical sync |
| Pin 69 | TFT_DE — TFT data enable |
| Pin 70 | TFT_BLK — TFT backlight control |
| Pin 71 | LCD0 — Segment LCD driver line 0 |
| Pin 72 | LCD1 — Segment LCD driver line 1 |
| Pin 73 | LCD2 — Segment LCD driver line 2 |
| Pin 74 | LCD3 — Segment LCD driver line 3 |
| Pin 75 | LCD4 — Segment LCD driver line 4 |
| Pin 76 | LCD5 — Segment LCD driver line 5 |
| Pin 77 | LCD6 — Segment LCD driver line 6 |
| Pin 78 | LCD7 — Segment LCD driver line 7 |
| Pin 79 | LCD8 — Segment LCD driver line 8 |
| Pin 80 | LCD9 — Segment LCD driver line 9 |
| Pin 81 | LCD10 — Segment LCD driver line 10 |
| Pin 82 | LCD11 — Segment LCD driver line 11 |
| Pin 83 | LCD12 — Segment LCD driver line 12 |
| Pin 84 | LCD13 — Segment LCD driver line 13 |
| Pin 85 | LCD14 — Segment LCD driver line 14 |
| Pin 86 | LCD15 — Segment LCD driver line 15 |
| Pin 87 | LCD16 — Segment LCD driver line 16 |
| Pin 88 | LCD17 — Segment LCD driver line 17 |
| Pin 89 | LCD18 — Segment LCD driver line 18 |
| Pin 90 | LCD19 — Segment LCD driver line 19 |
| Pin 91 | LCD20 — Segment LCD driver line 20 |
| Pin 92 | LCD21 — Segment LCD driver line 21 |
| Pin 93 | LCD22 — Segment LCD driver line 22 |
| Pin 94 | LCD23 — Segment LCD driver line 23 |
| Pin 95 | LCD24 — Segment LCD driver line 24 |
| Pin 96 | LCD25 — Segment LCD driver line 25 |
| Pin 97 | LCD26 — Segment LCD driver line 26 |
| Pin 98 | LCD27 — Segment LCD driver line 27 |
| Pin 99 | LCD28 — Segment LCD driver line 28 |
| Pin 100 | LCD29 — Segment LCD driver line 29 |
| Pin 101 | LCD30 — Segment LCD driver line 30 |
| Pin 102 | LCD31 — Segment LCD driver line 31 |
| Pin 103 | LCD32 — Segment LCD driver line 32 |
| Pin 104 | LCD33 — Segment LCD driver line 33 |
| Pin 105 | LCD34 — Segment LCD driver line 34 |
| Pin 106 | LCD35 — Segment LCD driver line 35 |
| Pin 107 | LCD36 — Segment LCD driver line 36 |
| Pin 108 | LCD37 — Segment LCD driver line 37 |
| Pin 109 | LCD38 — Segment LCD driver line 38 |
| Pin 110 | LCD39 — Segment LCD driver line 39 |
| Pin 111 | LCD40 — Segment LCD driver line 40 |
| Pin 112 | SPI0_SCK — SPI0 serial clock |
| Pin 113 | SPI0_MOSI — SPI0 master-out/slave-in |
| Pin 114 | SPI0_MISO — SPI0 master-in/slave-out |
| Pin 115 | SPI0_SS — SPI0 slave select |
| Pin 116 | SCI0_TX — Serial communication interface 0 transmit |
| Pin 117 | SCI0_RX — Serial communication interface 0 receive |
| Pin 118 | SCI1_TX — Serial communication interface 1 transmit |
| Pin 119 | SCI1_RX — Serial communication interface 1 receive |
| Pin 120 | IIC0_SDA — I2C0 serial data |
| Pin 121 | IIC0_SCL — I2C0 serial clock |
| Pin 122 | GPIO0 — General purpose I/O 0 |
| Pin 123 | GPIO1 — General purpose I/O 1 |
| Pin 124 | GPIO2 — General purpose I/O 2 |
| Pin 125 | GPIO3 — General purpose I/O 3 |
| Pin 126 | GPIO4 — General purpose I/O 4 |
| Pin 127 | GPIO5 — General purpose I/O 5 |
| Pin 128 | GPIO6 — General purpose I/O 6 |
| Pin 129 | GPIO7 — General purpose I/O 7 |
| Pin 130 | XCLKS — Crystal oscillator clock select |
| Pin 131 | EXTAL — External crystal/clock input |
| Pin 132 | XTAL — Crystal oscillator output |
| Pin 133 | VDDPLL — PLL supply voltage |
| Pin 134 | VSSPLL — PLL ground |
| Pin 135 | TEST — Factory test pin (tie to VSS in application) |
| Pin 136 | NC — Not connected (per datasheet) |
| Pin 137 | NC — Not connected (per datasheet) |
| Pin 138 | NC — Not connected (per datasheet) |
| Pin 139 | NC — Not connected (per datasheet) |
| Pin 140 | NC — Not connected (per datasheet) |
| Pin 141 | VDDX — I/O supply voltage (5V) |
| Pin 142 | VSSX — I/O ground |
| Pin 143 | VDDX2 — Secondary I/O supply voltage |
| Pin 144 | VSSX2 — Secondary I/O ground |
Typical Applications
MC9S12XHZ256VAG is suitable for 7 applications: Automotive Instrument Cluster with TFT Display, Hybrid Analog-Digital Dashboard Cluster, Automotive CAN Gateway Node, Industrial HMI Control Panel, Body Control Module (BCM) with Display, Two-Wheeler / Powersport Dashboard, Automotive Diagnostic and Telematics Module.
Automotive Instrument Cluster with TFT Display
The MC9S12XHZ256VAG is purpose-built for low-to-mid-tier automotive instrument clusters with color TFT panels. Its integrated TFT display driver eliminates an external graphics controller, reducing BOM cost by approximately $2-4 versus discrete TFT-controller solutions. The 4 MSCAN channels handle powertrain, body, and diagnostic buses simultaneously, while the XGATE coprocessor deterministically services CAN interrupts and TFT refresh events without burdening the main S12X CPU running application logic at 80MHz. Designed for -40C to +105C ambient under-hood and dashboard conditions.
Recommended
Hybrid Analog-Digital Dashboard Cluster
For hybrid dashboards combining stepper-motor-driven analog gauges with a central TFT or LCD information display, the MC9S12XHZ256VAG's integrated segment LCD driver plus TFT controller provides a single-chip solution. The 8 PWM channels directly drive up to 4 stepper motors for analog gauges (speedometer, tachometer, fuel, temperature) without external motor driver ICs. With 256 KB Flash and 12 KB RAM, sufficient code space exists for gauge calibration tables, warning logic, and turn-by-turn navigation rendering - all within an automotive-qualified 144-LQFP footprint.
Recommended
Automotive CAN Gateway Node
The MC9S12XHZ256VAG's 4 independent MSCAN (CAN 2.0) channels and 80MHz HCS12X core make it well suited for CAN gateway nodes bridging powertrain, body, chassis, and diagnostic buses. The XGATE coprocessor handles low-latency CAN message filtering and forwarding deterministically while the main CPU runs routing logic and diagnostic services (UDS/KWP2000). 256 KB Flash accommodates CAN DBC tables and gateway firmware, and the automotive -40C to +105C temperature grade ensures reliable operation in cabin and under-hood gateway placements.
Recommended
Industrial HMI Control Panel
Although automotive-targeted, the MC9S12XHZ256VAG also fits industrial HMI panels that need a color TFT interface and multi-protocol communication. Its integrated TFT driver simplifies panel designs for factory automation HMIs, machinery status displays, and building-automation touch panels. The 16-channel 10-bit ADC reads analog sensor inputs directly, while the 4 CAN channels support CANopen or DeviceNet industrial protocols. Industrial users typically deploy the CAG (commercial temperature grade) variant, but the VAG's wider temperature range provides extra margin in factory-floor environments.
Recommended
Body Control Module (BCM) with Display
Body control modules that integrate driver information displays benefit from the MC9S12XHZ256VAG's combination of CAN channels, PWM outputs, and integrated TFT/LCD drivers. The MCU can directly drive a small TFT panel showing door-status, climate-control, or rear-view camera information while handling BCM tasks like lighting, mirror control, and central locking. The 144-LQFP package exposes sufficient GPIO and peripheral pins for BCM applications, while automotive qualification satisfies OEM BCM requirements.
Recommended
Two-Wheeler / Powersport Dashboard
The MC9S12XHZ256VAG's automotive temperature grade, integrated TFT capability, and CAN support make it a strong fit for motorcycle, scooter, and ATV digital dashboards. These applications demand compact, low-cost cluster electronics with TFT or LCD displays showing speed, RPM, fuel, and gear-position indicators. The HCS12X's automotive pedigree and the part's wide temperature tolerance (-40C to +105C) handle vibration-prone, weather-exposed powersport environments better than commercial-grade MCUs.
Recommended
Automotive Diagnostic and Telematics Module
Telematics control units (TCUs) and off-board diagnostic tools leverage the MC9S12XHZ256VAG's 4 CAN channels to interface with multiple vehicle buses simultaneously (CAN, CAN-FD optional via firmware). The 80MHz CPU and XGATE coprocessor support OBD-II diagnostic protocol stacks (UDS, KWP2000) and data logging with timestamps. A small TFT or LCD can display diagnostic menus directly on the tool, removing the need for a tethered PC interface in service-bay equipment.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12XHZ256VAG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12XHZ384VAG | MC9S12XHZ512VAG | S912XHZ384F1VAG | S912XHZ512F1VAG |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 144-LQFP (20x20) | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same |
| Flash Memory | 256 KB | 384 KB (+50%) | 512 KB (+100%) | 384 KB (+50%) | 512 KB (+100%) |
| CPU Clock | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| MSCAN (CAN 2.0) Channels | 4 | 4 | 4 | 4 | 4 |
| Temperature Grade | Automotive (-40C to +105C) | Automotive (-40C to +105C) | Automotive (-40C to +105C) | Automotive (-40C to +105C) | Automotive (-40C to +105C) |
| TFT Display Driver | Integrated | Integrated | Integrated | Integrated | Integrated |
| XGATE Coprocessor | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | NRND (EOL announced) | Active | Active | Active | Active |
Key Differentiators
- Integrated TFT display driver in 144-LQFP (vs MC9S12XDP512CAL)
- Same-footprint Flash scalability (vs MC9S12XHZ512VAG)
- XGATE coprocessor for deterministic interrupt offload (vs MC9S12XS128MAE)
Design Notes
The MC9S12XHZ256VAG requires two supply rails: a 5V I/O rail (VDDX/VDDX2) for GPIO and a 1.8V internal core rail (VDD1/VDD2). The internal voltage regulator derives the 1.8V core rail from the 5V input, but requires adequate decoupling: place a 1uF X7R ceramic close to each VDD pin and a 10uF bulk capacitor near the regulator input. Add a 100nF capacitor between VDDA and VSSA for ADC reference stability, since TFT display switching can couple noise into the analog supply.
Estimated: at maximum 80MHz CPU clock with TFT, CAN, and PWM peripherals active, the MC9S12XHZ256VAG typically consumes 120-180 mW from the 5V rail. The 144-LQFP package has a junction-to-ambient thermal resistance (theta_JA) of approximately 45 C/W on a 4-layer JEDEC test board. At 85C ambient in an enclosed dashboard, the junction temperature rises 5-8C above ambient, leaving ~20C margin to the 150C automotive maximum. For sealed enclosures with no airflow, derate by adding a thermal copper pour beneath the exposed pad area.
Route the 4 MSCAN differential pairs (CAN0-CAN3) with 100-ohm characteristic impedance and keep them isolated from switching nodes (TFT clock lines, PWMs). The TFT data bus and clock (TFT_CLK, PAD0-15) are high-speed signals; length-match the clock to the data lines within 1mm and keep the bus away from analog ADC traces (AN0-AN15) by at least 3mm to prevent capacitive coupling that degrades ADC SNR.
Do not leave the BKGD/MODC pins floating during reset; the BDM mode select behavior depends on MODC state and a floating pin can lock the MCU in a debug-only state. Tie TEST pin (pin 135) to VSS for production boards, as the factory TEST pin is reserved for NXP production testing. The XGATE coprocessor requires its own firmware image linked into the application - failing to initialize it causes the S12X CPU to service all interrupts alone, halving determinism in time-critical CAN or TFT-refresh applications.
The TFT_CLK output frequency is derived from the system clock and can reach 30-50 MHz depending on panel resolution. Use a series 33-ohm damping resistor on TFT_CLK and route it on an inner PCB layer with a continuous ground plane beneath to control impedance (target 50 ohms). For TFT panels longer than 100mm trace length, add a clock buffer near the MCU to maintain edge rates and reduce EMI.
Compliance Information
RoHS compliant per NXP product page. AEC-Q100 qualified for automotive use - the 'V' suffix indicates automotive temperature grade (-40C to +105C). NRND (Not Recommended for New Designs) per NXP lifecycle policy, with Rochester Electronics as continuing-supply partner.
