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NXP Semiconductors MC68HC908AP32CFB
- Part No.:
- MC68HC908AP32CFB
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
MC68HC908AP32CFB.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 44QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
MC68HC908AP32CFB from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 32 KB on-chip Flash memory, 1 KB RAM, and integrated peripherals including SCI, SPI, I²C, ADC, PWM, and TIM modules. It operates at up to 8 MHz bus frequency, supports 5 V operation, and features low-power stop/wait modes - used in industrial control panels and embedded sensor interface modules.
For engineers reviewing the MC68HC908AP32CFB datasheet, MC68HC908AP32CFB pinout, MC68HC908AP32CFB application, or MC68HC908AP32CFB equivalent, key selection criteria include Flash size vs. code footprint, 8-channel 10-bit ADC resolution for analog sensing, and compatibility with legacy HC08 toolchains and MON ROM-based programming.
Technical Context
The MC68HC908AP32CFB implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) integrates a PLL for bus clock synthesis from internal RC or external crystal sources, enabling precise timing control across variable supply conditions.
System integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP), interrupt prioritization across 16 vectors, and low-power mode coordination. The Monitor ROM provides in-system programming via SCI without external hardware programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit index register and enhanced instruction set |
| Flash Memory | 32 KB on-chip Flash with block protection and in-application programming capability |
| RAM Size | 1 KB on-chip RAM for data and stack operations |
| ADC Resolution | 10-bit successive-approximation ADC with 8 input channels and programmable sample time |
| Max Bus Frequency | 8 MHz - determines instruction throughput and peripheral timing margins |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard TTL/CMOS logic interfaces and industrial power rails |
| I/O Pins | 40 general-purpose I/O pins with configurable pull-ups and interrupt-on-change capability |
Pinout & Package
MC68HC908AP32CFB is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm lead pitch and exposed thermal pad. Package dimensions are 10 mm × 10 mm × 1.6 mm (L × W × H), suitable for automated SMT assembly and moderate thermal dissipation in industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual-supply pins for digital core; require local 0.1 µF ceramic bypassing per pair |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 1–8 MHz fundamental-mode crystals; internal load capacitors configurable via CONFIG registers |
| SCI_TXD, SCI_RXD | Asynchronous serial interface | Full-duplex UART-compatible SCI channel for host communication or firmware updates |
| PORTA[7:0] | General-purpose I/O port | 8-bit bidirectional port with individual direction control and interrupt-on-change support |
| RESET | Active-low reset input | Asynchronous reset pin with internal pull-up; triggers POR/LVI/COP recovery sequence |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Enables in-system programming and debugging via SCI without external programmer hardware |
| Computer Operating Properly (COP) | Watchdog timer with software-resettable timeout prevents system lockup in unattended operation |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detection with programmable threshold (4.25 V or 3.8 V) ensures reliable reset during supply sag |
| PWM with buffered output | Supports glitch-free duty-cycle updates in motor control or LED dimming applications |
| Multi-Master I²C Interface | Allows direct connection to sensors, EEPROMs, and other I²C peripherals without arbitration conflicts |
Applications
| Industrial Control Panel | Smart Sensor Node |
|---|---|
Use Scenario: Local HMI with button inputs, LED indicators, and RS-232 diagnostics interface. IC Role / Device Role / Timing Role: Main controller executing state-machine logic, scanning inputs, driving outputs, and managing serial diagnostics. Use Value: 32 KB Flash accommodates feature-rich UI firmware; MON ROM enables field firmware updates over SCI. | Use Scenario: Battery-powered environmental sensor collecting temperature/humidity and transmitting via UART to gateway. IC Role / Device Role / Timing Role: Sensor interface MCU handling ADC sampling, I²C sensor reads, and low-power wake/sleep cycles. Use Value: Stop mode current < 1 µA extends battery life; 10-bit ADC provides sufficient resolution for calibrated sensor readings. |
| Motor Drive Interface | Legacy Equipment Retrofit |
Use Scenario: Fan speed control module using PWM to drive external MOSFET gate driver. IC Role / Device Role / Timing Role: Real-time PWM generator with dead-time insertion and fault monitoring via IRQ inputs. Use Value: Buffered PWM outputs prevent glitches during duty-cycle changes; TIM module supports precise edge-aligned timing. | Use Scenario: Replacement controller for aging PLC I/O modules requiring HC08 instruction compatibility. IC Role / Device Role / Timing Role: Drop-in functional replacement preserving existing PCB layout and firmware binary compatibility. Use Value: Pin-compatible with MC68HC908AP64/AP16 family; same CGM, SIM, and peripheral register map simplifies migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908AP64CFB | 64 KB Flash, identical package and pinout, same peripheral set | Higher code storage capacity for complex control algorithms or bootloader + application separation | Select when future firmware expansion or dual-bank update capability is required |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB Flash, 16 KB RAM, different architecture and toolchain | Requires full firmware rewrite; offers higher performance, USB, and advanced debug features | Choose for new designs needing scalability beyond 8-bit constraints or long-term roadmap alignment |
Compared with MC68HC908AP64CFB, the MC68HC908AP32CFB trades Flash capacity for cost and density optimization in fixed-function systems; versus S9KEAZ128AMLH, it retains HC08 ecosystem compatibility but lacks ARM-level interrupt latency and peripheral integration.
Availability
MC68HC908AP32CFB is available at Aetrix Electronics and suitable for industrial control panels, smart sensor nodes, motor drive interfaces, and legacy equipment retrofits requiring stable component supply and long-term manufacturing continuity.
Supply support for MC68HC908AP32CFB 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908AP32CFB belongs to the HCS08 microcontroller family, designed for cost-sensitive, low-power embedded control applications where deterministic real-time response and toolchain maturity are critical.
FAQ
What is the maximum operating frequency of the MC68HC908AP32CFB?
The MC68HC908AP32CFB supports a maximum bus frequency of 8 MHz. This is achieved via its integrated Clock Generator Module (CGM) with PLL, which multiplies the base oscillator frequency. The actual CPU instruction execution rate depends on bus frequency and instruction cycle count, with most instructions completing in 1–3 bus cycles. MC68HC908AP32CFB maintains timing integrity across its specified voltage range (4.5–5.5 V).
Does the MC68HC908AP32CFB support in-system programming?
Yes, the MC68HC908AP32CFB includes a 2 KB Monitor ROM (MON) that enables in-system programming via its Serial Communications Interface (SCI). This allows firmware updates without removing the device from the board or using external programming hardware. MC68HC908AP32CFB supports commands for reading, erasing, and programming Flash memory through ASCII-based protocol over SCI.
What low-power modes does the MC68HC908AP32CFB offer?
The MC68HC908AP32CFB provides two primary low-power modes: Wait Mode (CPU halted, peripherals active, wake via interrupt) and Stop Mode (all clocks stopped except optional RTC or LVI, wake via RESET or IRQ). In Stop Mode, typical current consumption is less than 1 µA at 5 V. MC68HC908AP32CFB retains RAM contents and register states across both modes, enabling rapid resumption of operation.
Is the MC68HC908AP32CFB pin-compatible with other AP-series devices?
Yes, the MC68HC908AP32CFB shares identical 44-pin QFP packaging and pin assignments with MC68HC908AP64CFB, MC68HC908AP16CFB, and MC68HC908AP8CFB. All AP-series variants use the same peripheral register map, interrupt vector table, and electrical characteristics - enabling hardware reuse across different Flash/RAM configurations. MC68HC908AP32CFB requires no PCB redesign when substituting within this family.
What development tools support the MC68HC908AP32CFB?
The MC68HC908AP32CFB is supported by legacy Freescale tools including CodeWarrior Development Studio for HC08, P&E Micro's Multilink debug probes, and standalone MON ROM utilities. NXP maintains documentation archives and reference schematics. MC68HC908AP32CFB firmware can be developed in C or assembly, with GCC-based toolchains also available via community ports.
MC68HC908AP32CFB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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:
- 32KB (32K 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:
MC68HC908AP32CFB FAQ
1.How can I place an order for MC68HC908AP32CFB through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908AP32CFB 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 MC68HC908AP32CFB reliable?
The price and inventory of MC68HC908AP32CFB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908AP32CFB is usually 5 days.
3.What payment methods are accepted for MC68HC908AP32CFB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908AP32CFB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908AP32CFB?
MC68HC908AP32CFB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908AP32CFB 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 MC68HC908AP32CFB?
For technical support, including MC68HC908AP32CFB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908AP32CFB requirements.
6.How does Aetrix verify that MC68HC908AP32CFB is sourced from the original manufacturer or authorized distributors?
All MC68HC908AP32CFB 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 MC68HC908AP32CFB meets industry standards.
7.What is the process for return or replacement of MC68HC908AP32CFB?
All MC68HC908AP32CFB units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908AP32CFB, 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 MC68HC908AP32CFB part is unused and in its original packaging.
Return procedure for MC68HC908AP32CFB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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