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NXP Semiconductors MC908AP64CFBE
- Part No.:
- MC908AP64CFBE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
MC908AP64CFBE.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44QFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
MC908AP64CFBE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller featuring 64 KB on-chip Flash memory, 2 KB RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), TIM, TBM, and CGM with PLL-based clock generation. It operates at up to 20 MHz bus frequency with internal voltage regulator (VREG) support and supports 5 V or 3 V supply operation in automotive and industrial control applications.
For engineers reviewing the MC908AP64CFBE datasheet, MC908AP64CFBE pinout, MC908AP64CFBE application, or MC908AP64CFBE equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in motor control and sensor interfacing, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MC908AP64CFBE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module integrates a phase-locked loop (PLL) supporting programmable multiplication (×1 to ×32) and reference divider selection, enabling precise bus clock derivation from internal RC or external crystal sources.
System integration includes a 10-bit successive-approximation ADC with configurable sample time and conversion trigger sources (software, TIM, SCI), plus dual asynchronous serial interfaces (SCI and IRSCI), and a multi-master I²C module compliant with Philips I²C-bus specification v2.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit index register and enhanced instruction set for efficient embedded control loops. |
| Flash Memory | 64 KB on-chip Flash with block protection, mass erase, and in-system programming capability via MON ROM. |
| RAM Size | 2 KB on-chip RAM, mapped to $0000–$07FF, used for stack, variables, and temporary data storage. |
| ADC Resolution | 10-bit successive-approximation ADC with 8 input channels and programmable conversion clock (500 kHz–1 MHz). |
| Bus Frequency | Up to 20 MHz derived from PLL output; supports dynamic clock switching between internal RC and crystal sources. |
| I/O Pins | 52 general-purpose I/O pins across PORTA–PORTE, with interrupt-capable KBI inputs and configurable pull-ups. |
| Supply Voltage | 2.7–5.5 V operation; internal voltage regulator (VREG) provides stable 3.3 V core supply when VDD ≥ 4.5 V. |
Pinout & Package
MC908AP64CFBE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, measuring 10 mm × 10 mm. The package supports surface-mount assembly and thermal dissipation suitable for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power Supply / Ground | Dedicated digital power and ground pins; multiple VDD/VSS pairs reduce noise coupling and improve signal integrity. |
| VDDA, VSSA | Analog Power / Analog Ground | Isolated analog supply and ground for ADC and oscillator circuits to minimize digital switching noise interference. |
| OSC1, OSC2 | Crystal Oscillator Input/Output | Connects to external quartz crystal (1–8 MHz) or ceramic resonator; supports low-power crystal mode with automatic gain control. |
| CGMXFC | PLL External Filter Capacitor | Connects external capacitor (typically 1–10 nF) to stabilize PLL loop filter; critical for jitter performance and lock stability. |
| PORTA[7:0] | General-Purpose I/O Port | 8-bit bidirectional port with individual direction control; supports KBI interrupts and peripheral function multiplexing (e.g., SCI TX/RX). |
| RESET | Active-Low Reset Input | Asynchronous reset pin; triggers POR/LVI/COP-initiated system reset and clears CPU registers and peripheral states. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Embedded 1 KB ROM providing in-circuit flash programming, memory dump, and bootloader functionality without external tools. |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detection with programmable threshold (2.5 V or 3.0 V) to prevent erratic operation during supply sag. |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms–1.6 s) and windowed enable mode to detect software hangs in safety-critical systems. |
| Keyboard Interrupt (KBI) | 8-input matrix scan interface with edge-triggered wake-up from Wait/Stop modes; reduces polling overhead in HMI applications. |
| Timebase Module (TBM) | Independent 16-bit counter with programmable prescaler and interrupt generation; decouples timing tasks from main CPU load. |
Applications
| Motor Control | Sensor Signal Conditioning |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using PWM output and quadrature encoder feedback. IC Role / Device Role / Timing Role: MCU executing PID algorithm, generating buffered PWM signals, sampling ADC for current sensing, and decoding encoder pulses via TIM input capture. Use Value: Integrated TIM with input capture and buffered PWM eliminates external logic; 10-bit ADC enables precise current measurement within ±0.5% full-scale error. |
Use Scenario: Industrial temperature monitoring using thermistor network and 4–20 mA transmitter interface. IC Role / Device Role / Timing Role: MCU reads thermistor voltage via ADC, computes linearized temperature, and drives DAC-equivalent output using PWM + RC filter and SCI for HART communication. Use Value: On-chip VREG ensures stable ADC reference under varying supply; SCI supports HART protocol physical layer with precise baud rate generation. |
| Automotive Body Control | Smart Appliance Interface |
Use Scenario: Central body controller managing door locks, interior lighting, and window lift with LIN bus coordination. IC Role / Device Role / Timing Role: MCU acts as LIN master node, schedules periodic frame transmission, monitors switch inputs via KBI, and controls relays through GPIO with COP supervision. Use Value: KBI enables immediate wake-up from Stop mode on keypress; COP prevents firmware lockup during LIN message parsing. |
Use Scenario: Washing machine main controller handling user interface, motor drive sequencing, and water level sensing. IC Role / Device Role / Timing Role: MCU executes state machine for wash cycles, samples pressure transducer via ADC, drives TRIACs via GPIO, and communicates with display via SPI. Use Value: 64 KB Flash accommodates full GUI logic and fault diagnostics; SPI supports high-speed display refresh without CPU overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908AP32CFBE | Same HCS08 core and pinout, but reduced Flash (32 KB) and RAM (1 KB); identical peripheral set and package. | Suitable for cost-sensitive designs with smaller firmware footprint and fewer runtime variables. | Select when application code size remains below 28 KB and RAM usage stays under 800 bytes to maintain margin. |
| S9KEAZ128AMLH | ARM Cortex-M0+ core, 128 KB Flash, 16 KB RAM, higher performance (40 MHz), but different architecture and non-pin-compatible package (64-LQFP vs. 64-QFP). | Required for applications needing floating-point math, USB device support, or future scalability beyond 8-bit throughput limits. | Choose only if migrating to ARM ecosystem; requires PCB redesign and full firmware re-architecture. |
Compared with MC908AP64CFBE, MC908AP32CFBE offers identical peripheral compatibility at lower memory cost, while S9KEAZ128AMLH provides significantly higher compute headroom but demands hardware and software rework - making the former a drop-in memory-downgrade option and the latter a platform-level upgrade path.
Availability
MC908AP64CFBE is available at Aetrix Electronics and suitable for motor control, sensor interface, automotive body electronics, and smart appliance design requiring stable component supply across extended product lifecycles.
Supply support for MC908AP64CFBE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors since 2015) pioneered mixed-signal microcontrollers for automotive and industrial markets, emphasizing robustness, integrated analog, and long-term supply assurance.
The MC908AP64CFBE belongs to the HCS08 family designed specifically for cost-effective, real-time control in harsh environments-featuring on-chip regulators, wide-voltage operation, and hardware safety features like COP and LVI.
FAQ
What is the maximum operating frequency of the MC908AP64CFBE?
The MC908AP64CFBE supports a maximum bus frequency of 20 MHz, achieved via its integrated Clock Generator Module (CGM) PLL circuit. This frequency is derived from internal RC or external crystal sources, with programmable multiplication factors (×1 to ×32) and reference dividers. The actual achievable frequency depends on supply voltage and temperature, and must comply with the AC electrical specifications in Section 22 of the official datasheet. MC908AP64CFBE maintains timing integrity across its full industrial temperature range (–40°C to +85°C).
Does the MC908AP64CFBE include an internal voltage regulator?
Yes, the MC908AP64CFBE integrates an internal voltage regulator (VREG) that generates a stable 3.3 V supply for the core logic when VDD is ≥ 4.5 V. This allows single-supply operation from 5 V while isolating sensitive analog and digital domains. The VREG output is accessible externally via the VREG pin and can power external components such as ADC references or sensors. MC908AP64CFBE's VREG behavior is controlled by CONFIG1 register bits LVIREGD and LVIPWRD, and its status is monitored in the SIM register set.
Can the MC908AP64CFBE perform in-system programming of its Flash memory?
Yes, the MC908AP64CFBE supports full in-system programming (ISP) of its 64 KB Flash memory using the embedded Monitor ROM (MON). This 1 KB ROM provides command-line interface access via SCI for erasing, programming, and verifying Flash blocks without external programmers. MC908AP64CFBE also supports background programming during normal execution and includes Flash protection mechanisms (block protect register and security byte) to prevent unauthorized access or overwrite.
What communication interfaces are available on the MC908AP64CFBE?
The MC908AP64CFBE integrates five serial communication modules: one standard SCI (UART), one IRSCI (infrared UART), one SPI, one multi-master I²C (MMIIC), and one dedicated LIN-capable SCI variant. All interfaces support independent baud rate generation, interrupt-driven operation, and DMA-like buffering via FIFO emulation in software. MC908AP64CFBE's SCI modules are pin-multiplexed with GPIO, allowing flexible routing on PCB layout while maintaining full protocol compliance per respective standards (ISO 9141, Philips I²C v2.1, SPI Mode 0/3).
How does the MC908AP64CFBE handle low-power operation?
The MC908AP64CFBE supports two low-power modes: Wait and Stop. In Wait mode, the CPU halts while peripherals (TIM, ADC, SCI) remain active and responsive to interrupts; in Stop mode, all clocks except LVI and RESET logic are disabled, reducing current draw to < 1 µA. Wake-up sources include external IRQ, KBI inputs, SCI idle line, and COP timeout. MC908AP64CFBE retains full RAM content and register state across both modes, enabling rapid resumption of real-time tasks without reinitialization.
MC908AP64CFBE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SCI, SPI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 32
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908AP64CFBE FAQ
1.How can I place an order for MC908AP64CFBE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908AP64CFBE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC908AP64CFBE reliable?
The price and inventory of MC908AP64CFBE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908AP64CFBE is usually 5 days.
3.What payment methods are accepted for MC908AP64CFBE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908AP64CFBE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908AP64CFBE?
MC908AP64CFBE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908AP64CFBE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC908AP64CFBE?
For technical support, including MC908AP64CFBE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908AP64CFBE requirements.
6.How does Aetrix verify that MC908AP64CFBE is sourced from the original manufacturer or authorized distributors?
All MC908AP64CFBE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC908AP64CFBE meets industry standards.
7.What is the process for return or replacement of MC908AP64CFBE?
All MC908AP64CFBE units undergo pre-shipment inspection (PSI). If there is an issue with MC908AP64CFBE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC908AP64CFBE part is unused and in its original packaging.
Return procedure for MC908AP64CFBE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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