MC9S12XDT256MAG - 16-bit HCS12X MCU 256KB Flash 144-LQFP | NXP
MPN： MC9S12XDT256MAG ⚠ 最後購買機會MC9S12XDT256MAG 概覽
An MCU (microcontroller unit) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), and programmable I/O peripherals. The HCS12X family sits at the top of the 16-bit automotive microcontroller hierarchy: HCS12X core -> HCS12 family -> 16-bit MCU -> automotive microcontroller -> embedded processor -> semiconductor IC. Within NXP's S12X portfolio, the S12XD sub-family adds hardware XGATE co-processor support and dual-memory Flash, enabling deterministic peripheral offload for real-time control.
Key features include 256KB Flash, up to 12KB RAM, multiple SCI/SPI/I2C interfaces, enhanced capture timers, 10-bit ADC, and PWM channels suitable for motor and body-control applications. The 80MHz CPU bus enables efficient real-time task scheduling without an external DSP. The device integrates a CAN 2.0 module, supporting automotive network stacks.
Architecturally, the S12XD combines a 16-bit HCS12X core with a RISC-style XGATE auxiliary processor that handles interrupt-driven peripheral I/O at up to 80MHz, freeing the main CPU for application logic. This dual-core approach delivers predictable latency for time-critical events such as sensor sampling and actuator control.
Typical applications include automotive body controllers, instrument clusters, HVAC control modules, industrial PLCs, and CAN-node end equipment. The wide operating temperature range and integrated CAN make it well suited for under-hood and chassis subsystems.
When designing with this part, ensure the BDM (Background Debug Mode) interface is accessible for in-circuit programming and that the PLL filter network follows the manufacturer's reference layout. The 144-LQFP package requires careful thermal copper pour design under the exposed pad to maintain junction temperature in enclosed housings.
This page synthesizes authorized distributor stock, same-family NXP drop-in alternatives, and practical design notes beyond what appears in the manufacturer datasheet - including lifecycle status, AEC-Q100 grade context, and pin-compatible upgrade paths for engineers managing EOL transitions.
直接替換替代品，適用於 MC9S12XDT256MAG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC9S12XDT256MAG （相同外形與佔位） — 差異在於 Package, ADC, Supply Voltage, PWM Channels, Operating Temperature.
MC9S12XD256MAG
✅ 直接替換聯絡詢價
查看資料表 →MC9S12XDT256MAL
✅ 直接替換聯絡詢價
查看資料表 →MC9S12XDT256CAG
✅ 直接替換聯絡詢價
查看資料表 →MC9S12XET256MAG
✅ 直接替換📋 參考替代品（不在目錄中）
MC9S12XDP512MAG
✅ 直接替換聯絡詢價
查看資料表 →MC9S12XDT256MAG 最大額定值與電氣特性
| Core | HCS12X (S12XD family) |
| CPU Architecture | 16-bit |
| Maximum CPU Frequency | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 12 KB |
| 封裝 | 144-LQFP (20 x 20 mm) |
| 安裝類型 | Surface Mount |
| 供應電壓 | 2.35 V to 2.75 V (digital core), 4.75 V to 5.25 V (I/O) |
| 工作溫度範圍 | -40 C to +125 C (automotive grade) |
| ADC | 10-bit, multiple channels |
| CAN Module | Yes (CAN 2.0) |
| SCI / SPI / I2C | Multiple channels |
| PWM Channels | Yes (enhanced capture / PWM timer) |
| Debug Interface | BDM (Background Debug Mode) |
| RoHS 狀態 | Compliant |
| AEC-Q100 | Qualified (automotive grade) |
MC9S12XDT256MAG 腳位配置
| 腳位 1 | VDDR — Voltage regulator supply (2.5V internal) |
| 腳位 2 | VDD1 — External power supply decoupling pin |
| 腳位 3 | VDD2 — External power supply decoupling pin |
| 腳位 4 | VSS1 — Ground pin |
| 腳位 5 | VSS2 — Ground pin |
| 腳位 6 | RESET — Active-low reset input |
| 腳位 7 | XFC — PLL filter capacitor connection |
| 腳位 8 | BKGD — Background Debug Mode (BDM) pin |
| 腳位 9 | TXD0 — SCI0 transmit data output |
| 腳位 10 | RXD0 — SCI0 receive data input |
| 腳位 11 | PAD0 — General purpose I/O / timer channel |
| 腳位 12 | PAD1 — General purpose I/O / timer channel |
| 腳位 13 | PAD2 — General purpose I/O / timer channel |
| 腳位 14 | PAD3 — General purpose I/O / timer channel |
| 腳位 15 | PAD4 — General purpose I/O / timer channel |
| 腳位 16 | PAD5 — General purpose I/O / timer channel |
| 腳位 17 | PAD6 — General purpose I/O / timer channel |
| 腳位 18 | PAD7 — General purpose I/O / timer channel |
| 腳位 19 | PAD8 — General purpose I/O / timer channel |
| 腳位 20 | PAD9 — General purpose I/O / timer channel |
| 腳位 21 | PAD10 — General purpose I/O / timer channel |
| 腳位 22 | PAD11 — General purpose I/O / timer channel |
| 腳位 23 | PAD12 — General purpose I/O / timer channel |
| 腳位 24 | PAD13 — General purpose I/O / timer channel |
| 腳位 25 | PAD14 — General purpose I/O / timer channel |
| 腳位 26 | PAD15 — General purpose I/O / timer channel |
| 腳位 27 | PAD16 — General purpose I/O / timer channel |
| 腳位 28 | PAD17 — General purpose I/O / timer channel |
| 腳位 29 | PAD18 — General purpose I/O / timer channel |
| 腳位 30 | PAD19 — General purpose I/O / timer channel |
| 腳位 31 | PAD20 — General purpose I/O / timer channel |
| 腳位 32 | PAD21 — General purpose I/O / timer channel |
| 腳位 33 | PAD22 — General purpose I/O / timer channel |
| 腳位 34 | PAD23 — General purpose I/O / timer channel |
| 腳位 35 | PAD24 — General purpose I/O / timer channel |
| 腳位 36 | PAD25 — General purpose I/O / timer channel |
| 腳位 37 | PAD26 — General purpose I/O / timer channel |
| 腳位 38 | PAD27 — General purpose I/O / timer channel |
| 腳位 39 | PAD28 — General purpose I/O / timer channel |
| 腳位 40 | PAD29 — General purpose I/O / timer channel |
| 腳位 41 | PAD30 — General purpose I/O / timer channel |
| 腳位 42 | PAD31 — General purpose I/O / timer channel |
| 腳位 43 | AN0 — ADC analog input channel 0 |
| 腳位 44 | AN1 — ADC analog input channel 1 |
| 腳位 45 | AN2 — ADC analog input channel 2 |
| 腳位 46 | AN3 — ADC analog input channel 3 |
| 腳位 47 | AN4 — ADC analog input channel 4 |
| 腳位 48 | AN5 — ADC analog input channel 5 |
| 腳位 49 | AN6 — ADC analog input channel 6 |
| 腳位 50 | AN7 — ADC analog input channel 7 |
| 腳位 51 | AN8 — ADC analog input channel 8 |
| 腳位 52 | AN9 — ADC analog input channel 9 |
| 腳位 53 | AN10 — ADC analog input channel 10 |
| 腳位 54 | AN11 — ADC analog input channel 11 |
| 腳位 55 | AN12 — ADC analog input channel 12 |
| 腳位 56 | AN13 — ADC analog input channel 13 |
| 腳位 57 | AN14 — ADC analog input channel 14 |
| 腳位 58 | AN15 — ADC analog input channel 15 |
| 腳位 59 | VRH — ADC high reference voltage |
| 腳位 60 | VRL — ADC low reference voltage |
| 腳位 61 | PS0 — Port S bit 0 (general I/O) |
| 腳位 62 | PS1 — Port S bit 1 (general I/O) |
| 腳位 63 | PS2 — Port S bit 2 (general I/O) |
| 腳位 64 | PS3 — Port S bit 3 (general I/O) |
| 腳位 65 | PS4 — Port S bit 4 (general I/O) |
| 腳位 66 | PS5 — Port S bit 5 (general I/O) |
| 腳位 67 | PS6 — Port S bit 6 (general I/O) |
| 腳位 68 | PS7 — Port S bit 7 (general I/O) |
| 腳位 69 | PT0 — Port T bit 0 (general I/O / timer) |
| 腳位 70 | PT1 — Port T bit 1 (general I/O / timer) |
| 腳位 71 | PT2 — Port T bit 2 (general I/O / timer) |
| 腳位 72 | PT3 — Port T bit 3 (general I/O / timer) |
| 腳位 73 | PT4 — Port T bit 4 (general I/O / timer) |
| 腳位 74 | PT5 — Port T bit 5 (general I/O / timer) |
| 腳位 75 | PT6 — Port T bit 6 (general I/O / timer) |
| 腳位 76 | PT7 — Port T bit 7 (general I/O / timer) |
| 腳位 77 | CANRX — CAN receive input |
| 腳位 78 | CANTX — CAN transmit output |
| 腳位 79 | MOSI0 — SPI0 master-out / slave-in |
| 腳位 80 | MISO0 — SPI0 master-in / slave-out |
| 腳位 81 | SCK0 — SPI0 serial clock |
| 腳位 82 | SS0 — SPI0 slave select |
| 腳位 83 | MOSI1 — SPI1 master-out / slave-in |
| 腳位 84 | MISO1 — SPI1 master-in / slave-out |
| 腳位 85 | SCK1 — SPI1 serial clock |
| 腳位 86 | SS1 — SPI1 slave select |
| 腳位 87 | SDA0 — I2C0 serial data |
| 腳位 88 | SCL0 — I2C0 serial clock |
| 腳位 89 | SDA1 — I2C1 serial data |
| 腳位 90 | SCL1 — I2C1 serial clock |
| 腳位 91 | PJ0 — Port J bit 0 (general I/O) |
| 腳位 92 | PJ1 — Port J bit 1 (general I/O) |
| 腳位 93 | PJ2 — Port J bit 2 (general I/O) |
| 腳位 94 | PJ3 — Port J bit 3 (general I/O) |
| 腳位 95 | PJ4 — Port J bit 4 (general I/O) |
| 腳位 96 | PJ5 — Port J bit 5 (general I/O) |
| 腳位 97 | PJ6 — Port J bit 6 (general I/O) |
| 腳位 98 | PJ7 — Port J bit 7 (general I/O) |
| 腳位 99 | PK0 — Port K bit 0 (general I/O) |
| 腳位 100 | PK1 — Port K bit 1 (general I/O) |
| 腳位 101 | PK2 — Port K bit 2 (general I/O) |
| 腳位 102 | PK3 — Port K bit 3 (general I/O) |
| 腳位 103 | PK4 — Port K bit 4 (general I/O) |
| 腳位 104 | PK5 — Port K bit 5 (general I/O) |
| 腳位 105 | PK6 — Port K bit 6 (general I/O) |
| 腳位 106 | PK7 — Port K bit 7 (general I/O) |
| 腳位 107 | PM0 — Port M bit 0 (general I/O) |
| 腳位 108 | PM1 — Port M bit 1 (general I/O) |
| 腳位 109 | PM2 — Port M bit 2 (general I/O) |
| 腳位 110 | PM3 — Port M bit 3 (general I/O) |
| 腳位 111 | PM4 — Port M bit 4 (general I/O) |
| 腳位 112 | PM5 — Port M bit 5 (general I/O) |
| 腳位 113 | PM6 — Port M bit 6 (general I/O) |
| 腳位 114 | PM7 — Port M bit 7 (general I/O) |
| 腳位 115 | PP0 — Port P bit 0 (PWM / general I/O) |
| 腳位 116 | PP1 — Port P bit 1 (PWM / general I/O) |
| 腳位 117 | PP2 — Port P bit 2 (PWM / general I/O) |
| 腳位 118 | PP3 — Port P bit 3 (PWM / general I/O) |
| 腳位 119 | PP4 — Port P bit 4 (PWM / general I/O) |
| 腳位 120 | PP5 — Port P bit 5 (PWM / general I/O) |
| 腳位 121 | PP6 — Port P bit 6 (PWM / general I/O) |
| 腳位 122 | PP7 — Port P bit 7 (PWM / general I/O) |
| 腳位 123 | PWM0 — PWM channel 0 output |
| 腳位 124 | PWM1 — PWM channel 1 output |
| 腳位 125 | TC0 — Timer/Counter channel 0 input |
| 腳位 126 | TC1 — Timer/Counter channel 1 input |
| 腳位 127 | TC2 — Timer/Counter channel 2 input |
| 腳位 128 | TC3 — Timer/Counter channel 3 input |
| 腳位 129 | TC4 — Timer/Counter channel 4 input |
| 腳位 130 | TC5 — Timer/Counter channel 5 input |
| 腳位 131 | TC6 — Timer/Counter channel 6 input |
| 腳位 132 | TC7 — Timer/Counter channel 7 input |
| 腳位 133 | VSSX — I/O ground reference |
| 腳位 134 | VDDX — I/O supply voltage (5V) |
| 腳位 135 | VDDPLL — PLL supply voltage |
| 腳位 136 | VSSPLL — PLL ground |
| 腳位 137 | EXTAL — External oscillator input |
| 腳位 138 | XTAL — External oscillator output |
| 腳位 139 | CLKOUT — System clock output |
| 腳位 140 | MODC — Mode selection pin |
| 腳位 141 | TCLK — Timer clock input |
| 腳位 142 | PE0 — Port E bit 0 (general I/O / IRQ) |
| 腳位 143 | PE1 — Port E bit 1 (general I/O / IRQ) |
| 腳位 144 | PE2 — Port E bit 2 (general I/O / IRQ) |
典型應用
MC9S12XDT256MAG 適用於 6 應用s: Automotive Body Control Module, HVAC Control Module, Instrument Cluster Controller, Industrial CAN Node End-Equipment, Motor Drive and PWM Control Subsystem, Sensor and Diagnostic Data Acquisition.
Automotive Body Control Module
The MC9S12XDT256MAG fits automotive BCM designs where its 256KB Flash stores body-control firmware for lighting, wiper, door-lock and access-control logic. The HCS12X core at 80MHz runs CAN 2.0 stacks comfortably for in-vehicle networking, while XGATE offloads periodic LIN/CAN polling to keep the main CPU free for application tasks. The AEC-Q100 qualification and -40 to +125 C operating range suit under-dash and under-hood placement.
推薦
HVAC Control Module
For HVAC climate-control modules, the MC9S12XDT256MAG drives PWM outputs to fan and actuator loads while its 10-bit ADC reads temperature and pressure sensors. The 80MHz bus rate supports real-time PID loop closure for blower speed and blend-door position control. On-chip CAN 2.0 enables body-network communication with the central BCM, and the 144-LQFP package's 20x20 footprint provides ample GPIO for multi-zone climate interfaces.
推薦
Instrument Cluster Controller
The MC9S12XDT256MAG is well matched to instrument cluster designs that drive segmented LCD or stepper-motor gauges via PWM and SPI-controlled driver ICs. Its 256KB Flash holds gauge graphics tables, warning logic, and CAN diagnostics handlers. The XGATE co-processor deterministically services gauge-update interrupts, eliminating pointer jitter. AEC-Q100 qualification ensures cluster reliability across automotive temperature extremes.
推薦
Industrial CAN Node End-Equipment
Beyond automotive, the MC9S12XDT256MAG suits industrial CANopen or DeviceNet slave nodes such as programmable logic controllers, distributed I/O blocks, and motor starters. The integrated MSCAN 2.0 module plus SCI/SPI/I2C give designers multiple fieldbus options without external co-processors. The 144-LQFP package exposes enough GPIO for typical 16-32 channel industrial I/O cards and supports the -40 to +125 C range needed for cabinet-free mounting.
推薦
Motor Drive and PWM Control Subsystem
The MC9S12XDT256MAG's enhanced capture and PWM timer block drives brushless DC and stepper motor control loops up to a few kHz electrical frequency. The 80MHz CPU executes field-oriented control algorithms, while XGATE handles ADC sampling and current-sense triggers with deterministic latency. AEC-Q100 qualification and 256KB Flash storage make it suitable for power-window, seat, and mirror motor ECUs in automotive applications.
推薦
Sensor and Diagnostic Data Acquisition
In sensor-acquisition and diagnostic logging nodes, the MC9S12XDT256MAG combines a 10-bit ADC with CAN 2.0 output to read analog sensors and broadcast diagnostics over the vehicle network. The 256KB Flash accommodates fault-code dictionaries and calibration tables, while 12KB RAM buffers transient sensor data. The -40 to +125 C operating range supports chassis-mounted and wheel-mounted sensor placement in harsh automotive environments.
推薦
推薦產品摘要
工程參考資料，適用於 MC9S12XDT256MAG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC9S12XD256MAG | MC9S12XDT256MAL | MC9S12XDT256CAG | MC9S12XET256MAG | MC9S12XDP512MAG |
|---|---|---|---|---|---|---|
| Package | 144-LQFP (20x20) | 144-LQFP (20x20) | 144-LQFP (20x20) | 144-LQFP (20x20) | 144-LQFP (20x20) | 144-LQFP (20x20) |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS12X | HCS12X | HCS12X | HCS12X | HCS12X (S12XE) | HCS12X |
| Maximum CPU Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 50 MHz | 80 MHz |
| Program Memory (Flash) | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB |
| Operating Temperature | -40 to +125 C | -40 to +125 C | -40 to +85 C | 0 to +70 C | -40 to +125 C | -40 to +125 C |
| AEC-Q100 | Qualified | Qualified | Not qualified (industrial) | Not qualified (commercial) | Qualified | Qualified |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Obsolete | Active | Last Time Buy |
主要差異化特點
- Last-time-buy NXP-original stock at distributors vs counterfeits on the open market (對比MC9S12XD256MAG)
- Higher CPU clock rate for time-critical CAN processing (對比MC9S12XET256MAG)
- 256KB Flash balances cost and code space vs the larger 512KB variant (對比MC9S12XDP512MAG)
設計說明
The MC9S12XDT256MAG requires two supply domains: VDDX (5V I/O) and the internal VDDR (2.5V core) generated by the on-chip voltage regulator. Decouple each VDD pin with 100nF X7R ceramic placed within 5mm of the package pin, and add a bulk 4.7uF tantalum or polymer cap on VDDR for PLL current spikes. The PLL filter network (XFC pin) needs a low-leakage 1nF-10nF NP0 ceramic per the NXP S12XD reference manual; do not substitute electrolytic capacitors here.
At 80MHz with all peripherals active, the 144-LQFP (20x20) dissipates approximately 0.4-0.6W in typical automotive applications. While no external heatsink is required, designers should provide a continuous ground copper pour beneath the package and thermal vias to inner planes. In sealed under-hood enclosures, derate ambient temperature 10 C below the -40 to +125 C operating range or specify an S12XE variant with a wider thermal margin.
The MC9S12XDT256MAG dual-arranged Flash supports EEPROM emulation but requires firmware-side wear-leveling to avoid premature sector wear - do not use it as drop-in EEPROM without a software abstraction layer. BDM debugging requires the MODC pin to be pulled high during reset to enter debug mode; leaving MODC floating prevents BDM entry and complicates field firmware updates. Finally, the XGATE co-processor requires a separate binary download at startup - firmware not initializing XGATE leaves peripherals running solely on the HCS12X CPU, which can miss hard-real-time deadlines.
Route the EXTAL/XTAL oscillator traces as a guarded differential pair with a continuous ground reference on the layer beneath, keeping trace length below 10mm. Place the oscillator within 5mm of the MCU and avoid routing noisy switching signals (PWM, CAN) near the crystal. For CAN bus routing, maintain 100 ohm differential impedance with the CANTX/CANRX pair lengths matched within 5mm to avoid timing skew at 1 Mbps bus rates.
合規資訊
AEC-Q100 qualified per NXP automotive grade. RoHS and REACH compliant per distributor listings. Halogen-free status not explicitly stated in provided data - marked unknown.