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NXP Semiconductors MC68HC908JL8CFAE
- Part No.:
- MC68HC908JL8CFAE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68HC908JL8CFAE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,353
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Product details
Overview
MC68HC908JL8CFAE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 8 KB on-chip Flash, 512 B RAM, and integrated peripherals including SCI, TIM, ADC, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency, supports 3.3 V or 5 V supply, and targets low-cost embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MC68HC908JL8CFAE datasheet, MC68HC908JL8CFAE pinout, MC68HC908JL8CFAE application, or MC68HC908JL8CFAE equivalent, key selection criteria include Flash endurance (100k erase/write cycles), built-in monitor ROM for in-system programming, IRQ/KBI interrupt latency under 4 µs, and compatibility with legacy HC08 toolchains and debug interfaces.
Technical Context
The MC68HC908JL8CFAE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its System Integration Module (SIM) provides configurable bus clock generation from internal RC or external crystal oscillators, with automatic clock recovery after reset and support for Wait/Stop low-power modes.
Peripheral integration includes an 8-channel 8-bit ADC with software-triggered conversion, a dual-channel Timer Interface Module (TIM) supporting input capture, output compare, and PWM, and a full-duplex Serial Communications Interface (SCI) with programmable baud rate and framing error detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit index register and 24-bit address space |
| Flash Memory | 8 KB on-chip Flash with 100,000 erase/write cycles and block protection |
| RAM Size | 512 bytes of on-chip RAM for data and stack operations |
| Max Bus Frequency | 8 MHz - determines instruction throughput and peripheral timing resolution |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels and software trigger |
| Supply Voltage | 2.7–5.5 V - enables direct interface with 3.3 V logic or legacy 5 V systems |
| Operating Temp | –40 °C to +85 °C - qualified for industrial ambient environments |
Pinout & Package
MC68HC908JL8CFAE is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm lead pitch and exposed thermal pad. The package meets JEDEC MS-026 standard and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power Supply / Ground | Dual power pins for noise isolation; VDD must be decoupled locally with 0.1 µF ceramic capacitor |
| OSC1, OSC2 | Crystal Oscillator Input/Output | Supports 1–8 MHz parallel-resonant crystals; internal load capacitors configurable via CONFIG register |
| PTA0–PTA7 | Port A I/O | 8-bit general-purpose port with pull-up enable and interrupt capability on PTA0–PTA3 |
| PTB0–PTB7 | Port B I/O | 8-bit general-purpose port; PTB0–PTB1 support SCI TxD/RxD functions |
| PTD4, PTD5 | TIM Channel 0/1 Inputs | Input capture and output compare pins for timer-based motor control or pulse measurement |
| PTE0, PTE1 | TIM Channel 2/3 Inputs | Additional timer I/O for dual independent PWM outputs or quadrature decoding |
| IRQ | External Interrupt Request | Edge-sensitive active-low input with configurable debounce and priority over most interrupts |
| RESET | Active-Low Reset Input | Asynchronous reset pin; internal pull-up ensures valid state during power-up |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | 2 KB factory-programmed ROM enabling in-circuit flash programming via SCI without external programmer |
| Computer Operating Properly (COP) | Configurable watchdog timer with independent RC oscillator - prevents system lockup in safety-critical loops |
| Keyboard Interrupt (KBI) | 8-input matrix scan with debounced edge detection and wake-from-Stop capability |
| Low-Voltage Inhibit (LVI) | On-chip voltage monitor with programmable trip points (4.2 V / 3.7 V) to prevent erratic operation during brownout |
| Break Module | Hardware-assisted debug entry via BKGD pin - supports single-step, memory read/write, and register inspection |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor with local display and RS-232 reporting. IC Role / Device Role / Timing Role: Main controller executing sensor polling, ADC conversion, SCI transmission, and LED status updates. Use Value: Integrated 8-bit ADC and SCI eliminate external signal conditioning and level-shifting ICs; MON ROM enables field firmware updates over serial link. |
Use Scenario: Washing machine main control board managing motor drive, water valves, and user interface. IC Role / Device Role / Timing Role: Central sequencer coordinating relay actuation, KBI-based button scanning, and fault monitoring via COP and LVI. Use Value: IRQ and KBI support fast response to door switch events; Stop mode reduces standby current to <10 µA for energy compliance. |
| Motor Speed Controller | Legacy Industrial I/O Module |
Use Scenario: Brushed DC motor speed regulation using analog feedback and PWM output. IC Role / Device Role / Timing Role: Real-time PWM generation (via TIM), ADC-based tachometer sampling, and closed-loop PID calculation. Use Value: Buffered PWM outputs ensure glitch-free duty cycle changes; 8 MHz bus clock enables 10 kHz PWM carrier with 0.4% resolution. |
Use Scenario: DIN-rail mounted digital I/O expansion unit interfacing PLCs via RS-485. IC Role / Device Role / Timing Role: Protocol translator and discrete I/O manager handling MODBUS RTU framing and opto-isolated input sampling. Use Value: SCI supports half-duplex RS-485 with automatic direction control; PTA/PTB ports provide 16 GPIOs with programmable slew rate for EMI reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8 | RS08 core, 8 KB Flash, no hardware multiply; lacks KBI and MON ROM; lower interrupt latency but no in-system programming | Suitable for cost-sensitive, non-upgradable designs where debug access is via BDM only | Select when lowest BOM cost is critical and field firmware updates are unnecessary |
| MC9S08QG8 | HCS08 core, 8 KB Flash, same peripheral set but 20-pin SOIC package; no PTD/PTE timer pins; reduced I/O count (16 vs 32) | Better suited for space-constrained PCBs where full 44-pin I/O is not required | Choose for compact designs needing identical firmware compatibility but fewer external connections |
Compared with MC9RS08KA8, the MC68HC908JL8CFAE offers field-upgradable firmware and keyboard interrupt support; compared with MC9S08QG8, it delivers expanded I/O and dual TIM channels for complex timing tasks - both trade-offs impact layout, toolchain, and long-term serviceability.
Availability
MC68HC908JL8CFAE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and motor speed controllers requiring stable component supply across multi-year production cycles.
Supply support for MC68HC908JL8CFAE 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 MC68HC908JL8CFAE belongs to the legacy HCS08 microcontroller family designed for cost-effective, low-power embedded control in resource-constrained industrial and consumer systems.
FAQ
What is the maximum operating frequency of the MC68HC908JL8CFAE?
The MC68HC908JL8CFAE supports a maximum bus clock frequency of 8 MHz. This is derived from its internal oscillator or external crystal source, and defines the timing base for all peripherals including TIM, SCI, and ADC. The CPU executes instructions at this bus rate, with most instructions completing in 1–3 bus cycles.
Does the MC68HC908JL8CFAE include a hardware debug interface?
Yes, the MC68HC908JL8CFAE features a single-wire Background Debug Mode (BDM) interface via the BKGD pin. This allows full in-circuit debugging - including breakpoint setting, register inspection, and memory read/write - without halting real-time peripheral operation, and is supported by standard Freescale/NXP BDM tools.
Can the MC68HC908JL8CFAE perform in-system programming without external hardware?
Yes, the MC68HC908JL8CFAE contains a 2 KB Monitor ROM (MON) that enables in-system programming over its SCI interface. Using the MON commands, users can erase, program, and verify Flash memory directly through a UART connection - eliminating the need for dedicated programmers in production or field update scenarios.
What ADC capabilities does the MC68HC908JL8CFAE provide?
The MC68HC908JL8CFAE integrates an 8-bit successive-approximation ADC with 8 input channels. Conversion is software-triggered, supports single-ended inputs, and completes in 21 bus cycles (2.6 µs at 8 MHz). Reference voltage is selectable between VDD and an internal 1.2 V bandgap source.
How does the COP watchdog function on the MC68HC908JL8CFAE?
The Computer Operating Properly (COP) module on the MC68HC908JL8CFAE is an independent watchdog timer driven by its own RC oscillator. It requires periodic servicing via the COPCTL register; failure to clear within the timeout window (configurable from 2 ms to 1.1 s) triggers a system reset, ensuring recovery from software hangs or infinite loops.
MC68HC908JL8CFAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 26
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 13x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908JL8CFAE FAQ
1.How can I place an order for MC68HC908JL8CFAE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JL8CFAE 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 MC68HC908JL8CFAE reliable?
The price and inventory of MC68HC908JL8CFAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JL8CFAE is usually 5 days.
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Once your MC68HC908JL8CFAE 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 MC68HC908JL8CFAE?
For technical support, including MC68HC908JL8CFAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JL8CFAE requirements.
6.How does Aetrix verify that MC68HC908JL8CFAE is sourced from the original manufacturer or authorized distributors?
All MC68HC908JL8CFAE 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 MC68HC908JL8CFAE meets industry standards.
7.What is the process for return or replacement of MC68HC908JL8CFAE?
All MC68HC908JL8CFAE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JL8CFAE, 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 MC68HC908JL8CFAE part is unused and in its original packaging.
Return procedure for MC68HC908JL8CFAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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