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NXP Semiconductors MC68HC908AP16CFB
- Part No.:
- MC68HC908AP16CFB
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
MC68HC908AP16CFB.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 44QFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,140
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Product details
Overview
MC68HC908AP16CFB from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 16 KB on-chip Flash, 512 B RAM, and integrated peripherals including SCI, SPI, IIC, ADC, PWM, and TIM modules. It operates at up to 8 MHz internal bus speed, supports 3.0–5.5 V supply, and features low-power stop/wait modes for battery-powered industrial controls and sensor nodes.
For engineers reviewing the MC68HC908AP16CFB datasheet, MC68HC908AP16CFB pinout, MC68HC908AP16CFB application, or MC68HC908AP16CFB equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases - all grounded in the official Rev. 4 datasheet and Freescale's AP-family documentation.
Technical Context
The MC68HC908AP16CFB implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Clock Generator Module (CGM) integrates a PLL for frequency multiplication and selectable reference clock sources (internal RC, crystal, or external). The System Integration Module (SIM) manages reset sequencing, interrupt prioritization, and low-power mode entry/exit.
Peripherals include a 10-bit, 8-channel ADC with programmable sample time and conversion trigger options; a Timer Interface Module (TIM) with input capture, output compare, and buffered/unbuffered PWM; and dual serial interfaces - SCI (asynchronous UART) and SPI (master/slave synchronous). All modules are memory-mapped and controlled via dedicated registers accessible in user mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 32+ instructions optimized for embedded control loops. |
| Flash Memory | 16 KB on-chip Flash with block protection, mass erase, and in-system programming capability. |
| RAM Size | 512 bytes of on-chip RAM for stack, variables, and temporary buffers - sufficient for real-time sensor fusion tasks. |
| ADC Resolution | 10-bit successive-approximation ADC with 8 input channels and configurable clock division (500 kHz–1 MHz). |
| Max Bus Frequency | 8 MHz system bus speed enables deterministic timing for motor control PWM generation and serial protocol handling. |
| Supply Voltage | 3.0 V to 5.5 V operation allows direct interface with legacy 5 V logic and modern 3.3 V sensors without level-shifting. |
| I/O Pins | 34 general-purpose I/O pins with configurable pull-ups, interrupt-on-change, and peripheral multiplexing. |
Pinout & Package
MC68HC908AP16CFB is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm pitch, compliant with JEDEC MS-026. The package provides thermal and mechanical stability for industrial temperature range (–40°C to +85°C) operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD/VSS for digital logic; VDDA/VSSA for analog ADC and PLL sections - require separate bypassing. |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 1–8 MHz fundamental-mode crystals; internal load capacitors configurable via CONFIG register. |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; triggers full system initialization and clears CPU registers and peripheral states. |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with interrupt-on-change capability; PA0–PA3 support SCI, SPI, and IIC alternate functions. |
| PTA0–PTA7 | Port T (Timer) I/O | 8-bit port with dedicated TIM channel pins (e.g., PTA0 = TIMCH0, PTA1 = TIMCH1) for PWM and capture signals. |
| AD0–AD7 | ADC input channels | 8 analog inputs mapped to Port A pins; share physical pins with digital I/O - configured via ADCTL register. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | On-chip 1 KB ROM providing bootloader, flash programming routines (EE_WRITE/EE_READ), and SCI-based debug interface - eliminates need for external programmer. |
| Low-Voltage Inhibit (LVI) | Hardware voltage monitor with programmable trip points (4.25 V / 3.75 V / 3.25 V) prevents erratic operation during brown-out conditions. |
| Computer Operating Properly (COP) | Watchdog timer with software-resettable window; configurable timeout (0.5 ms–1.6 s) ensures fail-safe recovery in safety-critical applications. |
| Keyboard Interrupt Module (KBI) | 8-input matrix scan engine with debounce filtering and wake-from-stop capability - ideal for keypad-based HMI systems. |
| IRSCI Support | Infrared serial interface with carrier generation (38 kHz) and pulse-width modulation - enables remote control receiver integration without external ICs. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from hall-effect sensors and PWM-driven H-bridge drivers. IC Role / Device Role / Timing Role: Central controller executing PID algorithm, generating 8-bit PWM outputs, sampling analog current/voltage, and communicating status via SCI. Use Value: On-chip 10-bit ADC and 8-MHz bus enable sub-100 µs loop execution; MON ROM simplifies field firmware updates over serial link. | Use Scenario: Battery-powered environmental monitoring node measuring temperature, humidity, and CO₂ with periodic wireless upload. IC Role / Device Role / Timing Role: Low-power system manager coordinating sensor reads, data logging to EEPROM, and SCI-to-Bluetooth bridge handshaking. Use Value: Stop mode current < 1 µA extends battery life; KBI and LVI ensure reliable wake-on-event and brown-out recovery. |
| Home Appliance UI | Automotive Body Control |
Use Scenario: Microwave oven control panel with membrane keypad, LED display driver, and safety interlock monitoring. IC Role / Device Role / Timing Role: Keypad scanner (KBI), LED segment driver (via GPIO/PWM), and door switch watchdog (COP + IRQ). Use Value: 34 I/O pins support direct LED drive and matrix scanning; IRSCI enables remote diagnostics without added components. | Use Scenario: Interior lighting module managing dimmable LED strips, occupancy detection, and LIN bus communication. IC Role / Device Role / Timing Role: LIN slave node processing sensor inputs, generating PWM-dimmable outputs, and responding to master commands via SCI. Use Value: 5.5 V tolerant I/O interfaces directly with automotive 12 V supply rails; built-in LVI prevents reset glitches during load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CFD | RS08 core, 8 KB Flash, no PLL, max 20 MHz bus (with internal oscillator), smaller footprint (20-pin SOIC). | Lacks TIM advanced features (no buffered PWM), reduced ADC channels (4 vs. 8), lower memory - suitable for simpler UI or sensor readout only. | Select when cost and board space are critical and full AP-series peripheral set is unnecessary. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB Flash, 16 KB RAM, higher performance, USB, CAN, and enhanced ADC (16-bit). | Requires toolchain migration, larger PCB footprint, higher power consumption - justified only for future-proofing or complex connectivity needs. | Choose for new designs requiring scalability beyond 8-bit constraints, especially where CAN or USB is required. |
Compared with MC9RS08KA8CFD, the MC68HC908AP16CFB offers superior peripheral integration and deterministic real-time response; versus S9KEAZ128AMLH, it delivers lower BOM cost, simpler certification path, and proven reliability in long-lifecycle industrial deployments.
Availability
MC68HC908AP16CFB is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UIs, and automotive body control modules requiring stable component supply across multi-year production cycles.
Supply support for MC68HC908AP16CFB 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 markets, with deep heritage in microcontroller innovation dating back to Motorola's 6800 family.
The MC68HC908AP16CFB belongs to the HCS08-based AP-family designed specifically for cost-sensitive, high-reliability embedded control applications demanding robust analog integration, low-power operation, and field-programmable Flash - particularly in white goods and industrial automation.
FAQ
What is the maximum operating frequency of the MC68HC908AP16CFB?
The MC68HC908AP16CFB supports a maximum system bus frequency of 8 MHz, achieved via its integrated PLL circuit which multiplies the internal or external reference clock. This frequency is specified under 5.0 V supply and 25°C ambient conditions per the Rev. 4 datasheet, and enables precise timing for PWM generation, ADC sampling, and serial communications without external clock synthesis.
Does the MC68HC908AP16CFB include on-chip debug capability?
Yes, the MC68HC908AP16CFB includes a 1 KB Monitor ROM (MON) that provides in-circuit debugging and flash programming functionality via the SCI interface. This allows firmware updates and basic runtime inspection without requiring an external debugger or JTAG pod - a key feature confirmed in Chapter 8 of the official datasheet.
What are the supported low-power modes for the MC68HC908AP16CFB?
The MC68HC908AP16CFB supports two hardware low-power modes: Wait Mode (CPU halted, peripherals active, wake on interrupt) and Stop Mode (all clocks stopped except LVI and COP, wake on RESET or IRQ). Typical Stop Mode current is less than 1 µA at 3.0 V, making it suitable for battery-backed applications - values verified in Section 22.3 of the Rev. 4 datasheet.
Can the MC68HC908AP16CFB operate from a 3.3 V supply?
Yes, the MC68HC908AP16CFB is fully specified for operation from 3.0 V to 5.5 V, including 3.3 V nominal systems. Its internal voltage regulator (VREG) and LVI circuitry are calibrated across this range, and all I/O pins are 5 V tolerant - enabling direct interfacing with both 3.3 V sensors and legacy 5 V peripherals without level shifters.
How many ADC channels does the MC68HC908AP16CFB provide?
The MC68HC908AP16CFB integrates a 10-bit successive-approximation ADC with 8 input channels (AD0–AD7), each mapped to dedicated pins on Port A. Channel selection, conversion trigger source, and sample time are fully programmable via the ADCTL and ADCSC registers - details confirmed in Chapter 15 of the Rev. 4 datasheet.
MC68HC908AP16CFB 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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K 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:
MC68HC908AP16CFB FAQ
1.How can I place an order for MC68HC908AP16CFB through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908AP16CFB 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 MC68HC908AP16CFB reliable?
The price and inventory of MC68HC908AP16CFB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908AP16CFB is usually 5 days.
3.What payment methods are accepted for MC68HC908AP16CFB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908AP16CFB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908AP16CFB?
MC68HC908AP16CFB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908AP16CFB 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 MC68HC908AP16CFB?
For technical support, including MC68HC908AP16CFB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908AP16CFB requirements.
6.How does Aetrix verify that MC68HC908AP16CFB is sourced from the original manufacturer or authorized distributors?
All MC68HC908AP16CFB 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 MC68HC908AP16CFB meets industry standards.
7.What is the process for return or replacement of MC68HC908AP16CFB?
All MC68HC908AP16CFB units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908AP16CFB, 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 MC68HC908AP16CFB part is unused and in its original packaging.
Return procedure for MC68HC908AP16CFB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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