MC9S12A256BCFU - HCS12 16-Bit 25MHz 256KB Flash MCU | NXP
N.º da peça: MC9S12A256BCFU ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $25.8 | $258,00 |
| 100 | $22.95 | $2.295,00 |
| 500 | $20.4 | $10.200,00 |
| 1.000 | $18.2 | $18.200,00 |
MC9S12A256BCFU Visão geral
A microcontroller (MCU) is a self-contained processing system that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), and peripheral interfaces on a single silicon die. The HCS12 architecture is a 16-bit CISC core from the Motorola/Freescale (now NXP) S12 family, designed for deterministic real-time control in automotive and industrial applications, and positioned hierarchically as: HCS12 -> 16-bit MCU -> microcontroller -> embedded processor -> semiconductor. The MC9S12A256BCFU is one of the highest-memory-density members of the original S12A sub-family.
Key features include 256KB on-chip Flash (in-application reprogrammable in 512-byte sectors), 4KB EEPROM for data storage, 12KB RAM, 8-channel 10-bit ADC, up to 25MHz bus clock via an on-chip PLL, two SCI, two SPI, an 8-channel 16-bit timer with PWM, and a CAN 2.0 A/B module. The part operates from a single 5V supply and supports an industrial -40C to +85C temperature range, making it suitable for under-hood and factory-floor environments.
Architecturally, the HCS12 core uses a 16-bit accumulator-based ALU with enhanced indexed addressing, background debug mode (BDM) for non-intrusive in-circuit development, and a memory management scheme supporting up to 1MB linear address space. The 80-QFP package exposes the full set of multiplexed GPIO, ADC inputs, and communication lines, enabling direct PCB integration of complex node functions without external glue logic.
Typical applications include automotive body controllers, instrument cluster electronics, industrial CAN nodes, sensor aggregation hubs, and ruggedized embedded control boards. The on-chip CAN 2.0 module is particularly valuable in distributed vehicle networks where deterministic multi-node communication is required. The wide operating temperature range and high-noise-immunity design also suit HVAC and motor control appliances.
When designing with this MCU, plan for a 5V analog supply and a 5V digital supply (which may be tied together with proper decoupling), plus a noise-isolated 2.5V AVDD for the ADC. Use the BDM interface for development and field firmware update via the in-application Flash programmer, and allocate adequate PCB ground area beneath the exposed die-pad to meet thermal and EMI requirements.
This page synthesizes distributor stock, same-package drop-in alternates, and practical design notes not found in any single distributor listing, giving engineers a single source to evaluate MC9S12A256BCFU for new designs, second-source qualification, or legacy board rework.
Alternativas drop-in para MC9S12A256BCFU — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MC9S12A256BCFU (mesmo formato e footprint) — diferindo em ADC, Supply Voltage, Package, Core, Core Architecture.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC9S12A256CFUE
✅ Drop-In✓ Em estoque
$47.08 / unidade
Ver ficha técnica →MC9S12A256BCPV
✅ Drop-In✓ Em estoque
$10.45 / unidade
Ver ficha técnica →MC9S12A256CPVE
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC9S12A512CFUE
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC9S12A128BCFU
✅ Drop-In✓ Em estoque
$18.2 / unidade
Ver ficha técnica →MC9S12A256BCFU Classificações máximas e características elétricas
| Manufacturer | NXP Semiconductors (formerly Freescale/Motorola) |
| Series | HCS12 / S12A |
| Core | HCS12 16-bit CISC |
| Program Memory | 256 KB Flash (256K x 8) |
| RAM | 12 KB |
| EEPROM | 4 KB |
| Maximum CPU Frequency | 25 MHz (bus clock via PLL) |
| Tensão de alimentação | 5 V single supply |
| Temperatura de operação | -40 C to +85 C (industrial) |
| ADC | 10-bit, 8 channels |
| Encapsulamento | 80-QFP (14 x 14 mm) |
| Tipo de montagem | Surface Mount |
| Communication | 2x SCI (UART), 2x SPI, 1x CAN 2.0 A/B, I2C |
| Timers / PWM | 8-channel 16-bit timer with PWM |
| GPIO | Up to 59 multiplexed I/O |
| Debug Interface | BDM (Background Debug Mode) |
Configuração de pinos do MC9S12A256BCFU
| Pino 1 | VRH — ADC high reference voltage |
| Pino 2 | VRL — ADC low reference voltage |
| Pino 3 | VDDA — Analog supply voltage |
| Pino 4 | VSSA — Analog ground |
| Pino 5 | PAD0/AN0 — Port AD bit 0 / ADC analog input 0 |
| Pino 6 | PAD1/AN1 — Port AD bit 1 / ADC analog input 1 |
| Pino 7 | PAD2/AN2 — Port AD bit 2 / ADC analog input 2 |
| Pino 8 | PAD3/AN3 — Port AD bit 3 / ADC analog input 3 |
| Pino 9 | PAD4/AN4 — Port AD bit 4 / ADC analog input 4 |
| Pino 10 | PAD5/AN5 — Port AD bit 5 / ADC analog input 5 |
| Pino 11 | PAD6/AN6 — Port AD bit 6 / ADC analog input 6 |
| Pino 12 | PAD7/AN7 — Port AD bit 7 / ADC analog input 7 |
| Pino 13 | VDDR — Regulator supply voltage |
| Pino 14 | VSSR — Regulator ground |
| Pino 15 | VDD1 — Internal logic supply 1 |
| Pino 16 | VDD2 — Internal logic supply 2 |
| Pino 17 | VSS1 — Internal logic ground 1 |
| Pino 18 | VSS2 — Internal logic ground 2 |
| Pino 19 | BKGD — Background Debug Mode pin |
| Pino 20 | RESET — External reset (active low) |
| Pino 21 | PE0/XIRQ — Port E bit 0 / external IRQ |
| Pino 22 | PE1/IRQ — Port E bit 1 / IRQ |
| Pino 23 | PE2 — Port E bit 2 |
| Pino 24 | PE3 — Port E bit 3 |
| Pino 25 | PE4/ECLK — Port E bit 4 / E-clock output |
| Pino 26 | PE5/MODA — Port E bit 5 / mode select A |
| Pino 27 | PE6/MODB — Port E bit 6 / mode select B |
| Pino 28 | PE7 — Port E bit 7 |
| Pino 29 | PA0 — Port A bit 0 |
| Pino 30 | PA1 — Port A bit 1 |
| Pino 31 | PA2 — Port A bit 2 |
| Pino 32 | PA3 — Port A bit 3 |
| Pino 33 | PA4 — Port A bit 4 |
| Pino 34 | PA5 — Port A bit 5 |
| Pino 35 | PA6 — Port A bit 6 |
| Pino 36 | PA7 — Port A bit 7 |
| Pino 37 | PB0 — Port B bit 0 |
| Pino 38 | PB1 — Port B bit 1 |
| Pino 39 | PB2 — Port B bit 2 |
| Pino 40 | PB3 — Port B bit 3 |
| Pino 41 | PB4 — Port B bit 4 |
| Pino 42 | PB5 — Port B bit 5 |
| Pino 43 | PB6 — Port B bit 6 |
| Pino 44 | PB7 — Port B bit 7 |
| Pino 45 | PC0 — Port C bit 0 |
| Pino 46 | PC1 — Port C bit 1 |
| Pino 47 | PC2 — Port C bit 2 |
| Pino 48 | PC3 — Port C bit 3 |
| Pino 49 | PC4 — Port C bit 4 |
| Pino 50 | PC5 — Port C bit 5 |
| Pino 51 | PC6 — Port C bit 6 |
| Pino 52 | PC7 — Port C bit 7 |
| Pino 53 | PP0/KWP0 — Port P bit 0 / PWM / KWP module |
| Pino 54 | PP1/KWP1 — Port P bit 1 / PWM / KWP module |
| Pino 55 | PP2/KWP2 — Port P bit 2 / PWM / KWP module |
| Pino 56 | PP3/KWP3 — Port P bit 3 / PWM / KWP module |
| Pino 57 | PP4/KWP4 — Port P bit 4 / PWM / KWP module |
| Pino 58 | PP5/KWP5 — Port P bit 5 / PWM / KWP module |
| Pino 59 | PP6/KWP6 — Port P bit 6 / PWM / KWP module |
| Pino 60 | PP7/KWP7 — Port P bit 7 / PWM / KWP module |
| Pino 61 | PS0/RxD0 — Port S bit 0 / SCI0 receive |
| Pino 62 | PS1/TxD0 — Port S bit 1 / SCI0 transmit |
| Pino 63 | PS2/RxD1 — Port S bit 2 / SCI1 receive |
| Pino 64 | PS3/TxD1 — Port S bit 3 / SCI1 transmit |
| Pino 65 | PS4/MISO0 — Port S bit 4 / SPI0 MISO |
| Pino 66 | PS5/MOSI0 — Port S bit 5 / SPI0 MOSI |
| Pino 67 | PS6/SCK0 — Port S bit 6 / SPI0 SCK |
| Pino 68 | PS7/SS0 — Port S bit 7 / SPI0 SS |
| Pino 69 | PT0/IOC0 — Port T bit 0 / timer channel |
| Pino 70 | PT1/IOC1 — Port T bit 1 / timer channel |
| Pino 71 | PT2/IOC2 — Port T bit 2 / timer channel |
| Pino 72 | PT3/IOC3 — Port T bit 3 / timer channel |
| Pino 73 | PT4/IOC4 — Port T bit 4 / timer channel |
| Pino 74 | PT5/IOC5 — Port T bit 5 / timer channel |
| Pino 75 | PT6/IOC6 — Port T bit 6 / timer channel |
| Pino 76 | PT7/IOC7 — Port T bit 7 / timer channel |
| Pino 77 | CAN_TX — CAN 2.0 transmit output |
| Pino 78 | CAN_RX — CAN 2.0 receive input |
| Pino 79 | XOUT — Crystal oscillator output |
| Pino 80 | XIN — Crystal oscillator input / EXTAL |
Aplicações típicas
MC9S12A256BCFU é adequado para 6 aplicaçãos: Automotive Body Control Module, Industrial CAN Node Controller, HVAC and Appliance Control Board, Instrument Cluster Driver, Sensor Aggregation Hub, Motor Control and PWM Drive Board.
Automotive Body Control Module
The MC9S12A256BCFU is well suited for central body controllers in mid-size vehicles because it integrates a CAN 2.0 A/B controller, two SCI/UART, two SPI, and an 8-channel 16-bit timer/PWM on a single 16-bit core running at 25MHz. With 256KB Flash it can host a full BCM firmware image plus bootloader, while 4KB EEPROM supports non-volatile configuration storage (trim, learned customer preferences, fault logs). The 5V single-supply operation and industrial temperature grade match under-dash automotive environments, and the 80-QFP package gives enough GPIO to drive lights, wipers, door locks, and switches directly.
Recomendado
Industrial CAN Node Controller
The MC9S12A256BCFU's on-chip CAN 2.0 module plus 256KB Flash makes it an ideal distributed node controller in industrial CANopen and DeviceNet networks. The 25MHz HCS12 core executes deterministic control loops while the CAN peripheral handles message arbitration with hardware acceptance filtering. Its 8-channel 10-bit ADC reads analog sensors directly, the 16-bit timer provides PWM outputs for proportional valves or motor speed, and 12KB RAM supports protocol stacks and control buffers. Industrial temperature range (-40 to +85C) tolerates cabinet and machine-mount environments.
Recomendado
HVAC and Appliance Control Board
The MC9S12A256BCFU fits HVAC and white-goods controllers that need a 5V single-supply MCU with multiple PWM channels, ADC inputs for temperature/pressure sensors, and enough Flash for control algorithms plus UI state machines. Its 256KB Flash hosts modulation firmware, lookup tables for compressor curves, and diagnostic routines. The 4KB EEPROM retains user settings through power cycles. The 8-channel 16-bit timer provides zero-crossing controlled TRIAC drive, while the HCS12 deterministic interrupt latency keeps line-frequency timing tight.
Recomendado
Instrument Cluster Driver
For automotive instrument clusters, the MC9S12A256BCFU drives stepper gauge motors, multiplexed LCD/LED displays, and reads fuel/temperature sensors via its 10-bit ADC. The CAN 2.0 module receives vehicle data from the BCM or powertrain ECU, while the SCI/UART ports support diagnostic interfaces (K-line or LIN master) for service tooling. 256KB Flash stores gauge calibration tables and warning logic, 12KB RAM holds display buffer state, and the 80-QFP package fits behind the cluster bezel. Industrial temperature grade covers dashboard thermal stress.
Recomendado
Sensor Aggregation Hub
The MC9S12A256BCFU serves as a sensor-aggregation hub that reads multiple analog/digital sensors and forwards processed data over CAN. Its 8-channel 10-bit ADC plus external interrupt-driven digital inputs can scan temperature, pressure, level, and position sensors, while the 256KB Flash holds sensor linearization tables and filtering code. The 12KB RAM supports circular buffers for multiple sensor streams, and the two SCI/SPI interfaces expose service and expansion ports. Deterministic HCS12 interrupt handling keeps scan loops time-aligned across the cluster.
Recomendado
Motor Control and PWM Drive Board
The MC9S12A256BCFU's 8-channel 16-bit timer with PWM outputs directly drives brushless DC, stepper, or brushed DC motor stages. The HCS12 core runs field-oriented control or trapezoidal commutation routines with deterministic 25MHz timing, while 256KB Flash fits motor state-machine code plus tuning parameters. The on-chip CAN broadcasts motor telemetry back to the host controller. Industrial temperature and 5V supply suit factory-floor and 12V/24V vehicle motor subsystems. The 80-QFP footprint leaves room for current-sense amplifiers and gate drivers adjacent to the MCU.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC9S12A256BCFU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC9S12A256CFUE | MC9S12A256BCPV | MC9S12A256CPVE | MC9S12A512CFUE | MC9S12A128BCFU |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14) | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same | 80-QFP (14x14) - same |
| Core | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit | HCS12 16-bit |
| Max CPU Clock | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB (+100%) | 128 KB (-50%) |
| RAM | 12 KB | 12 KB | 12 KB | 12 KB | 14 KB | 12 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| CAN 2.0 Module | Yes | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Largest Flash density in S12A 80-QFP lineup (vs MC9S12A128BCFU)
- Built-in CAN 2.0 controller for distributed networks (vs MC9S12E64MFU)
- 256KB Flash vs S12E64MFU 64KB Flash (vs MC9S12E64MFU)
- HCS12 deterministic CISC core vs S12XS XGATE coprocessor (vs MC9S12XS128MAA)
Notas de projeto
The MC9S12A256BCFU operates from a single 5V supply (VDDR/VDDx) but requires a separately filtered analog supply (VDDA) for the on-chip 10-bit ADC. Use a ferrite bead or pi-filter between VDDx and VDDA to keep digital switching noise out of ADC measurements, with 100nF and 10uF ceramic decoupling within 5mm of each supply pin. The on-chip voltage regulator generates 2.5V for internal logic; do not draw external load current from this rail.
A common mistake is leaving the BKGD (Background Debug Mode) pin floating during production. Tie BKGD to VDD through a 10k pull-up so the device enters normal operating mode instead of BDM debug mode on reset. Likewise, ensure the MODE signals (MODA/MODB) are tied to the correct logic levels at reset to select single-chip vs expanded bus mode for production parts.
When routing the CAN bus, place a TVS diode and common-mode choke close to the CANH/CANL pins to meet automotive transient immunity (ISO 7637). Keep the CAN bus differential traces matched in length (<5mm mismatch) and routed over a continuous ground plane. The on-chip CAN module tolerates only up to +-8kV ESD without external protection; for production ECUs, add a dedicated CAN bus protector such as NXP TJA1042 companion and bus ESD array.
Estimated: at 5V VCC, 25MHz CPU, all peripherals enabled, and ambient 25C, the MC9S12A256BCFU dissipates approximately 200-300mW worst case (per S12A datasheet IDD figures). The 80-QFP package provides adequate thermal relief for typical industrial environments, but in sealed enclosures above 70C ambient, derate the CPU clock to 20MHz or improve board airflow. Calculate junction temperature as TJ = TA + (PD x theta_JA), with theta_JA of the 80-QFP on 4-layer PCB around 50 C/W.
Route the EXTAL/XTAL traces symmetrically within 5mm of the part, surrounded by a ground guard ring on the same layer, and place the load capacitors within 2mm of the oscillator pins. Avoid routing high-frequency signals (CAN, SCI) parallel to the crystal traces; keep the SCI/CAN transceiver within 25mm of the MCU and place bulk decoupling where the transceiver power enters the PCB. Connect all VSS pins to a single uninterrupted ground pour under the package.
Informações de conformidade
NXP S12A family is broadly AEC-Q100 qualified for automotive body applications per NXP product page. Lead-free reflow is supported. RoHS/REACH/halogen status: [DATA_NEEDED] - confirm on the latest NXP datasheet or material declaration.
