MC9S12B256MFUE - 16-bit HCS12 MCU, 256KB Flash | NXP
MPN: MC9S12B256MFUE ✗ Akhir HidupMC9S12B256MFUE Ringkasan
A microcontroller (MCU) is an integrated circuit that combines a CPU core, volatile memory (RAM), non-volatile program memory (Flash/ROM), and a configurable set of peripherals (timers, ADCs, communication interfaces) on a single die. The HCS12 core is a 16-bit CISC architecture from NXP that evolved from the HC11/HC12 lineage, optimized for automotive and industrial real-time control. The S12B family sits within the broader NXP 16-bit MCU hierarchy: HCS12 core -> S12B sub-family -> MC9S12B series -> specific MPNs with different memory/peripheral mixes.
Key features of the MC9S12B256MFUE include: 256KB Flash (256K x 8) with Fast Page Erase, 12KB RAM, 4KB EEPROM, a 10-bit ADC, an 8-channel PWM module, plus multiple communication interfaces including CAN 2.0 (msCAN), SCI, SPI, and I2C. The on-chip Enhanced Capture Timer (ECT) provides six 16-bit channels for input capture and output compare, supporting precise event timing required for engine and chassis control.
The device operates from 2.35V to 5.5V supply, supports -40C to +125C junction temperature, and integrates a PLL-based clock generator for flexible bus-speed scaling. The BDM (Background Debug Mode) interface and on-chip single-wire debug simplify in-circuit programming and field firmware updates. Internal architecture pairs the HCS12 CPU with a 32-bit HCS12X-style peripheral bus for higher throughput on time-critical registers.
Typical applications include automotive body and chassis modules, CAN-connected sensor nodes, industrial PLCs, HVAC controllers, and LIN/CAN bridges. Engineered for automotive multiplexing, the S12B family allows designers to swap memory or peripheral options without PCB rework, reducing time-to-market for tier-1 OEMs and aftermarket modules.
When designing with this MCU, place decoupling capacitors within 5 mm of each VDD/VSS pair, route the resonator/oscillator traces with a guarded ground channel, and keep CAN-H/CAN-L differential pairs at 100 ohm impedance. The NRND designation means NXP has flagged the part for limited future support - designers of new programs should evaluate S12XE or S12Z successors at the architectural level.
This page synthesizes distributor inventory, drop-in alternatives drawn from the same S12B and S12XE pin-compatible families, and practical design notes beyond what is in the standalone datasheet.
Alternatif penggantian untuk MC9S12B256MFUE — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC9S12B256MFUE (sama faktor bentuk dan footprint) — berbeda di dalam Package, ADC, Core, Program Memory Size, Data Bus Width.
MC9S12B128MFUE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC9S12B512MFUE
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC9S12DT256MFUE
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →MC9S12DJ256MFUE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC9S12GC32MFUE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC9S12D32MFUE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC9S12XA256VAA
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC9S12B256MFUE Rating Maksimal & Karakteristik Listrik
| Core | HCS12 (16-bit CISC) |
| CPU Family | S12B (MC9S12B series) |
| Maximum CPU Clock | 25 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 12 KB |
| EEPROM | 4 KB |
| Tegangan Pemuat | 2.35 V to 5.5 V |
| ADC | 10-bit, 8-channel |
| PWM Module | 8-channel, 8-bit |
| CAN (msCAN) | 1 x CAN 2.0A/B |
| SCI / SPI / I2C | Yes (1 each) |
| Enhanced Capture Timer | 6 x 16-bit channels |
| Suhu Kerja | -40 C to +125 C (junction) |
| Paket | 80-QFP, 14 x 14 mm, 1.0 mm pitch |
| Tipe Mounting | Surface Mount |
| Level MSL | 3 (168 hours) |
| Status RoHS | Compliant |
| Debug Interface | BDM (Background Debug Mode) |
| Lifecycle | NRND (Not Recommended for New Designs) |
Konfigurasi Pin MC9S12B256MFUE
| Pin produk 1 | VDDR — Voltage regulator bypass / internal regulator output |
| Pin produk 2 | VDD1 — Digital I/O supply voltage (2.35V to 5.5V) |
| Pin produk 3 | VSS1 — Digital I/O ground |
| Pin produk 4 | VDD2 — Digital I/O supply voltage |
| Pin produk 5 | VSS2 — Digital I/O ground |
| Pin produk 6 | BKGD — Background Debug Mode (BDM) serial communication |
| Pin produk 7 | RESET — External reset input (active low, internal pull-up) |
| Pin produk 8 | XTAL — Crystal oscillator input / external clock input |
| Pin produk 9 | EXTAL — Crystal oscillator feedback |
| Pin produk 10 | PE7 — Port E bit 7 (general I/O, XIRQ interrupt capable) |
| Pin produk 11 | PE6 — Port E bit 6 (general I/O) |
| Pin produk 12 | PE5 — Port E bit 5 (general I/O) |
| Pin produk 13 | PE4 — Port E bit 4 (general I/O) |
| Pin produk 14 | PE3 — Port E bit 3 (general I/O) |
| Pin produk 15 | PE2 — Port E bit 2 (general I/O) |
| Pin produk 16 | PE1 — Port E bit 1 (general I/O, IRQ interrupt) |
| Pin produk 17 | PE0 — Port E bit 0 (general I/O, IRQ interrupt) |
| Pin produk 18 | PA7 — Port A bit 7 (general I/O, address/data bus) |
| Pin produk 19 | PA6 — Port A bit 6 (general I/O) |
| Pin produk 20 | PA5 — Port A bit 5 (general I/O) |
| Pin produk 21 | PA4 — Port A bit 4 (general I/O) |
| Pin produk 22 | PA3 — Port A bit 3 (general I/O) |
| Pin produk 23 | PA2 — Port A bit 2 (general I/O) |
| Pin produk 24 | PA1 — Port A bit 1 (general I/O) |
| Pin produk 25 | PA0 — Port A bit 0 (general I/O) |
| Pin produk 26 | PB7 — Port B bit 7 (general I/O) |
| Pin produk 27 | PB6 — Port B bit 6 (general I/O) |
| Pin produk 28 | PB5 — Port B bit 5 (general I/O) |
| Pin produk 29 | PB4 — Port B bit 4 (general I/O) |
| Pin produk 30 | PB3 — Port B bit 3 (general I/O) |
| Pin produk 31 | PB2 — Port B bit 2 (general I/O) |
| Pin produk 32 | PB1 — Port B bit 1 (general I/O) |
| Pin produk 33 | PB0 — Port B bit 0 (general I/O) |
| Pin produk 34 | PC7 — Port C bit 7 (general I/O) |
| Pin produk 35 | PC6 — Port C bit 6 (general I/O) |
| Pin produk 36 | PC5 — Port C bit 5 (general I/O) |
| Pin produk 37 | PC4 — Port C bit 4 (general I/O) |
| Pin produk 38 | PC3 — Port C bit 3 (general I/O) |
| Pin produk 39 | PC2 — Port C bit 2 (general I/O) |
| Pin produk 40 | PC1 — Port C bit 1 (general I/O) |
| Pin produk 41 | PC0 — Port C bit 0 (general I/O) |
| Pin produk 42 | PD7 — Port D bit 7 (CAN / I/O shared) |
| Pin produk 43 | PD6 — Port D bit 6 (CAN / I/O shared) |
| Pin produk 44 | PD5 — Port D bit 5 (PWM / I/O shared) |
| Pin produk 45 | PD4 — Port D bit 4 (PWM / I/O shared) |
| Pin produk 46 | PD3 — Port D bit 3 (PWM / I/O shared) |
| Pin produk 47 | PD2 — Port D bit 2 (PWM / I/O shared) |
| Pin produk 48 | PD1 — Port D bit 1 (PWM / I/O shared) |
| Pin produk 49 | PD0 — Port D bit 0 (PWM / I/O shared) |
| Pin produk 50 | PAD07 — Port AD bit 7 (analog/digital input, 10-bit ADC) |
| Pin produk 51 | PAD06 — Port AD bit 6 (analog/digital input, 10-bit ADC) |
| Pin produk 52 | PAD05 — Port AD bit 5 (analog/digital input, 10-bit ADC) |
| Pin produk 53 | PAD04 — Port AD bit 4 (analog/digital input, 10-bit ADC) |
| Pin produk 54 | PAD03 — Port AD bit 3 (analog/digital input, 10-bit ADC) |
| Pin produk 55 | PAD02 — Port AD bit 2 (analog/digital input, 10-bit ADC) |
| Pin produk 56 | PAD01 — Port AD bit 1 (analog/digital input, 10-bit ADC) |
| Pin produk 57 | PAD00 — Port AD bit 0 (analog/digital input, 10-bit ADC) |
| Pin produk 58 | VRH — ADC reference high voltage |
| Pin produk 59 | VRL — ADC reference low voltage |
| Pin produk 60 | VDD3 — Digital I/O supply |
| Pin produk 61 | VSS3 — Digital I/O ground |
| Pin produk 62 | PP7 — Port P bit 7 (PWM channel 7) |
| Pin produk 63 | PP6 — Port P bit 6 (PWM channel 6) |
| Pin produk 64 | PP5 — Port P bit 5 (PWM channel 5) |
| Pin produk 65 | PP4 — Port P bit 4 (PWM channel 4) |
| Pin produk 66 | PP3 — Port P bit 3 (PWM channel 3) |
| Pin produk 67 | PP2 — Port P bit 2 (PWM channel 2) |
| Pin produk 68 | PP1 — Port P bit 1 (PWM channel 1) |
| Pin produk 69 | PP0 — Port P bit 0 (PWM channel 0) |
| Pin produk 70 | PS7 — Port S bit 7 (SPI / I2C / SCI shared) |
| Pin produk 71 | PS6 — Port S bit 6 (SPI / I2C / SCI shared) |
| Pin produk 72 | PS5 — Port S bit 5 (SPI / I2C / SCI shared) |
| Pin produk 73 | PS4 — Port S bit 4 (SPI / I2C / SCI shared) |
| Pin produk 74 | PS3 — Port S bit 3 (SPI / I2C / SCI shared) |
| Pin produk 75 | PS2 — Port S bit 2 (SPI / I2C / SCI shared) |
| Pin produk 76 | PS1 — Port S bit 1 (SPI / I2C / SCI shared) |
| Pin produk 77 | PS0 — Port S bit 0 (SPI / I2C / SCI shared) |
| Pin produk 78 | XFC — PLL loop filter capacitor |
| Pin produk 79 | VDD4 — Digital I/O supply |
| Pin produk 80 | VSS4 — Digital I/O ground |
Aplikasi Umum
MC9S12B256MFUE cocok untuk 7 aplikasis: Automotive Body Control Module (BCM), Industrial Sensor Hub with CAN Output, HVAC Climate Control Unit, LIN/CAN Gateway Bridge, Battery Management Module (12V/24V Automotive), Automotive Instrument Cluster Auxiliary MCU, CAN-Connected Lighting Module.
Automotive Body Control Module (BCM)
The MC9S12B256MFUE is well suited to body control modules because it integrates 256 KB Flash for door/window/lamp logic plus a msCAN port for chassis-class networking. The 10-bit ADC reads ratiometric switches and battery voltage (up to 5.5 V tolerant) directly, and the 8-channel PWM drives LED dimming and mirror motors at 8-bit resolution. Compared with a discrete + LIN approach, putting the algorithm on the HCS12 core removes an external logic chip and reduces BOM cost. The 12 KB SRAM and 4 KB EEPROM are sufficient for storing learned trim positions and fault codes. Designers should budget 5-8 KB of Flash for the BDM-friendly bootloader used in field firmware updates.
Direkomendasikan
Industrial Sensor Hub with CAN Output
The MC9S12B256MFUE serves as a CAN-connected industrial sensor hub: the 10-bit ADC digitizes analog sensors while the msCAN reports filtered readings on a 250 kbps bus. With 256 KB Flash, ample room remains for sensor linearization curves, digital filters, and a CANopen-style object dictionary. Operating from -40C to +125C allows deployment near motors and hydraulic actuators. The 25 MHz HCS12 core provides enough headroom for floating-point math and dual-axis sensor fusion without an external DSP. Place a CAN transceiver such as TJA1040 within 50 mm of the CAN pins to keep the differential pair matched at 100 ohm and meet IEC 61000-4-2 ESD on the bus.
Direkomendasikan
HVAC Climate Control Unit
Climate-control units benefit from the MC9S12B256MFUE because the PWM module drives blower motors and stepper valves directly, while the ADC reads thermistor inputs for closed-loop temperature regulation. The 8-channel 8-bit PWM eliminates the need for a separate motor-driver MCU, and the on-chip EEPROM saves user-preference setpoints across power cycles. With a 2.35 V to 5.5 V supply range, the part survives cranking transients on 12 V automotive buses when paired with an external regulator. The Enhanced Capture Timer measures AC-line frequencies for 50/60 Hz hum rejection. Comparable in capability to dedicated HVAC MCUs, the B256 adds 256 KB Flash for graphical LCD menu code.
Direkomendasikan
LIN/CAN Gateway Bridge
Use the MC9S12B256MFUE as a low-cost LIN-to-CAN bridge for automotive network segments. The SCI1 channel pairs with a TJA1027 LIN transceiver, while the msCAN port sits on the chassis CAN backbone. With 256 KB Flash the part holds the full LIN 2.1 diagnostic stack and CAN transport layer simultaneously. The HCS12 core executes the translation table at sub-millisecond latency, faster than typical LIN frame deadlines. Compared with dedicated bridge ICs, the B256 gives firmware-upgrade capability and OEM-customizable node behaviors. Keep the LIN and CAN traces separated by a ground pour to limit cross-bus noise coupling.
Direkomendasikan
Battery Management Module (12V/24V Automotive)
For automotive battery monitoring, the MC9S12B256MFUE reads stack voltage, current shunt, and temperature sensors via its 10-bit ADC. The EEPROM stores battery aging parameters and SoH (state-of-health) history - 4 KB is enough for ~30 days of hourly logs. CAN connectivity streams SoC (state-of-charge) to the vehicle ECU. The wide 2.35 V to 5.5 V supply lets the part operate directly from a 12 V rail after a small LDO. Designers should verify the ADC's 10-bit precision across the -40C to +125C range; for higher accuracy consider the S12X derivatives with 12-bit ADC.
Direkomendasikan
Automotive Instrument Cluster Auxiliary MCU
The MC9S12B256MFUE sits as an auxiliary controller driving stepper-motor gauges and warning lamps in an instrument cluster. Each PWM channel controls a single analog gauge, and the ADC reads fuel-level sender and oil-pressure inputs. The 256 KB Flash stores graphic-segment rendering code and CAN diagnostic tables. Compared with discrete logic, this approach yields a single firmware build that scales across car models by changing lookup tables in Flash. The NRND lifecycle status means designers planning new cluster programs should pivot to S12ZVL or S32K families - the B256 remains viable for legacy platforms only.
Direkomendasikan
CAN-Connected Lighting Module
The MC9S12B256MFUE powers an automotive lighting module where the 8-channel PWM drives LED strings at 8-bit brightness per channel, and the msCAN bus receives lighting commands from the BCM. The 256 KB Flash contains the boot loader, LED thermal-folding algorithm, and CAN diagnostic handler. Operating junction temperature up to 125C supports under-hood placement. Compared with discrete 8-bit PWM expanders, the B256 reduces PCB area by roughly 60 percent. Pair each PWM output with an external MOSFET driver since the on-chip PWM is logic-level only and cannot sink incandescent bulb currents directly.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC9S12B256MFUE — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC9S12B128MFUE | MC9S12B512MFUE | MC9S12DT256MFUE | MC9S12XA256VAA |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP 14x14 mm | 80-QFP 14x14 mm (same) | 80-QFP 14x14 mm (same) | 80-QFP 14x14 mm (same) | 80-QFP 14x14 mm (same) |
| Flash Memory | 256 KB | 128 KB (-50%) | 512 KB (+100%) | 256 KB (same) | 256 KB (same) |
| RAM | 12 KB | 8 KB | 16 KB | 12 KB | 12 KB |
| CPU Core | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12X 16-bit + XGate co-processor |
| Maximum CPU Clock | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 40 MHz |
| CAN Controllers | 1 x msCAN | 1 x msCAN | 1 x msCAN | 2 x msCAN | 5 x msCAN |
| SCI / SPI / I2C | 1 / 1 / 1 | 1 / 1 / 1 | 1 / 1 / 1 | 2 / 1 / 1 | 2 / 1 / 1 |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active |
Diferensiator Kunci
- Largest Flash in the 80-QFP 14x14 S12B lineup with active CPU clock at 25 MHz (vsMC9S12B128MFUE)
- Pin-compatible upgrade path to dual-CAN with no PCB change (vsMC9S12DT256MFUE)
- Legacy-compatible HCS12 core without the XGate co-processor (vsMC9S12XA256VAA)
Catatan Desain
Place a 100 nF decoupling capacitor on every VDD/VSS pair (VDD1/SS1 through VDD4/SS4) within 5 mm of the pin. Add a single 10 uF bulk tantalum or ceramic at the supply entry point. The internal 2.5 V regulator requires a 1 uF low-ESR cap on VDDR (pin 1); failure to add this cap causes erratic PLL lock behavior. Total estimated decoupling budget: ~4 x 100 nF + 1 x 10 uF + 1 x 1 uF. Estimated total capacitor cost is approximately $0.20 per board at qty 1000.
Keep the XTAL/EXTAL traces short (under 10 mm) and surround them with a guarded ground channel. Place the crystal load capacitors within 5 mm of each pin and connect their common node to a quiet analog ground. If an external CMOS clock drives EXTAL, leave XTAL floating. For CAN-bus applications, route CAN-H/CAN-L as a 100 ohm differential pair, matching length within 5 mm, and keep the bus away from switching power traces by at least 3 mm. The 80-QFP 14x14 mm footprint allows generous creepage but still requires a ground pour under the package to reduce thermal resistance.
Do not connect the BKGD (Background Debug) pin to a push-pull driver; it uses an open-drain scheme with an internal pull-up. Reverse-engineered clone parts marked 9S12B256 are electrically similar but may disable the BDM lock command, allowing code extraction - always source from authorized distributors or directly from NXP. The NRND status on the NXP product page does not mean production has stopped - stock is still active as of 2026-10-21 - but new designs should evaluate S12Z or S32K derivatives.
Estimated: at 25 MHz CPU clock with all peripherals active and 5.0 V VDD, the MC9S12B256MFUE draws approximately 60 mA, dissipating ~300 mW. With a QFP-80 theta-JA of roughly 45 C/W on a 4-layer PCB with 1 oz copper, junction rise above 25 C ambient is ~13.5 C - well within the 125 C maximum. For tight enclosures above 85 C ambient, add thermal vias under the center pad and increase copper pour area. The part is specified for -40 C to +125 C junction operation per the verified NXP family data.
Informasi Konformitas
RoHS compliant per NXP material declaration. Not AEC-Q100 qualified in this MPN suffix - for AEC-Q100 automotive-grade operation use the validated S12X/Q families. Halogen-free status not stated in the available data; set to unknown.
