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NXP Semiconductors MC68HC908LJ24CFQ
- Part No.:
- MC68HC908LJ24CFQ
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC68HC908LJ24CFQ.pdf
- Description:
- IC MCU 8BIT 24KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
MC68HC908LJ24CFQ from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 24 KB on-chip FLASH, 512 B RAM, integrated LCD driver (up to 32 segments), real-time clock (RTC), IRSCI, SPI, I²C, and 10-bit ADC. It operates at up to 8 MHz bus frequency and supports low-power stop/wait modes for battery-powered instrumentation and industrial control.
For engineers reviewing the MC68HC908LJ24CFQ datasheet, MC68HC908LJ24CFQ pinout, MC68HC908LJ24CFQ application, or MC68HC908LJ24CFQ equivalent, key selection criteria include its integrated RTC with calendar/alarm functions, 32-segment LCD drive capability, IRSCI infrared communication support, and SuperFlash® programmable memory with block protection.
Technical Context
The MC68HC908LJ24CFQ implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) integrates a PLL for flexible clock synthesis from internal RC or external crystal sources, enabling precise bus timing across voltage and temperature ranges.
The System Integration Module (SIM) coordinates reset sources-including POR, LVI, COP, and external RST-and manages low-power modes with configurable wake-up sources from IRQ, KBI, RTC alarms, or IRSCI activity. The IRSCI module combines infrared encoder/decoder logic with standard SCI UART functionality for contactless serial communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit architecture with 16-bit index register and enhanced instruction set |
| FLASH Memory | 24 KB SuperFlash® with block erase, program, and protection registers |
| RAM | 512 bytes of on-chip static RAM for data and stack storage |
| ADC | 10-bit successive-approximation ADC with 8 input channels and VREFH/VREFL references |
| LCD Driver | Static or multiplexed (1/2–1/4 duty) drive for up to 32 segments with VLCD bias generation |
| RTC | Real-time clock with calendar (year/month/day/hour/min/sec), alarm, chronograph, and calibration registers |
| IRSCI | Integrated infrared serial interface supporting NEC and RC-5 protocols plus standard UART framing |
Pinout & Package
MC68HC908LJ24CFQ is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MS-026. Pin assignments are defined per Section 1.5 (Pin Assignments) and Section 1.6 (Pin Functions) of the Rev. 2.1 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Digital core power (VDD) and return (VSS); separate analog ground (VSSA) and analog supply (VDDA) for ADC/LCD/PLL |
| OSC1, OSC2 | Crystal oscillator terminals | Supports external crystal (32.768 kHz for RTC or 1–8 MHz for main clock) or ceramic resonator |
| RST | Active-low reset input | Asynchronous external reset; also accepts internal reset sources via SIM |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit general-purpose port with keyboard interrupt capability on select pins |
| PTB0–PTB7 | Port B bidirectional I/O | Includes TxD/RxD (IRSCI), SPI MOSI/MISO/SCK, and TIM channel I/O |
| PTC0–PTC7 | Port C bidirectional I/O | Supports I²C SDA/SCL, ADC inputs, and LCD frontplane/backplane outputs |
| PTD0–PTD7 | Port D bidirectional I/O | Includes TIM clock inputs (T1CLK/T2CLK), CGMXFC filter capacitor connection |
| PTE0–PTE7 | Port E bidirectional I/O | Configurable as LCD frontplane/backplane or general-purpose I/O |
| PTF0–PTF7 | Port F bidirectional I/O | Supports LCD segment drive (FP0–FP32, BP0–BP3) and analog reference inputs (VREFH/VREFL) |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® FLASH memory | Enables in-system programming, 100K write/erase cycles, and hardware block protection for firmware security |
| Integrated RTC with calendar | Provides year/month/day/hour/minute/second tracking, alarm interrupts, and ±1 ppm calibration adjustment |
| 32-segment LCD driver | Eliminates external display controller; supports static, 1/2, or 1/4 duty drive with software-configurable bias |
| IRSCI dual-mode interface | Combines infrared modulation/demodulation with full-duplex UART operation on shared pins PTB0/PTB1 |
| Low-voltage inhibit (LVI) | Generates reset when VDD drops below 2.7 V (typical), ensuring reliable operation during brown-out conditions |
| Computer Operating Properly (COP) watchdog | Configurable timeout (0.5 ms to 1.0 s) with windowed enable to detect firmware lockup or timing faults |
Applications
| Industrial Panel Meter | Medical Patient Monitor |
|---|---|
|
Use Scenario: Standalone digital panel meter measuring temperature, pressure, or flow with local LCD readout and IR-based configuration. IC Role / Device Role / Timing Role: Primary system controller executing measurement acquisition, linearization, display refresh, and IR command parsing. Use Value: Integrated 10-bit ADC, 32-segment LCD driver, and IRSCI eliminate discrete support ICs-reducing BOM count and PCB area by ≥3 components. |
Use Scenario: Portable vital signs monitor displaying pulse rate, SpO₂, and battery status on segmented LCD with clinician-programmable thresholds via IR remote. IC Role / Device Role / Timing Role: Real-time sensor hub managing ADC sampling, RTC-stamped event logging, and IR-triggered parameter updates. Use Value: On-chip RTC with calendar and alarm enables timestamped data capture and scheduled alerts without external timekeeping IC. |
| Smart Energy Meter Display | Appliance Control Board |
|
Use Scenario: Residential electricity meter with LCD showing kWh, tariff period, and outage history, updated via IR telemetry from utility handheld. IC Role / Device Role / Timing Role: Dedicated display and IR interface controller interfacing with main metering SoC over SPI or UART. Use Value: IRSCI supports NEC protocol natively-enabling direct compatibility with standard utility IR remotes without firmware translation layer. |
Use Scenario: Microwave oven control board requiring keypad scanning, LCD status display, relay timing, and safety interlock monitoring. IC Role / Device Role / Timing Role: Secondary MCU handling HMI, user input, display, and auxiliary timing (e.g., door open timeout, cooling fan delay). Use Value: Keyboard interrupt module (KBI) with debounced scan and low-power wake-on-keypress extends battery life in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908LK24CFQ | Same HCS08 core and peripheral set, but adds 2 KB EEPROM and removes IRSCI module | Better suited for applications requiring nonvolatile parameter storage without IR communication | Select when EEPROM retention > IR interface; not drop-in due to missing IRSCI pins and firmware dependencies |
| S9KEAZ128AMLH | ARM Cortex-M0+ core, 128 KB FLASH, 16 KB RAM, no integrated LCD or IRSCI, but adds CAN and USB | Targets higher-performance, connected systems where CAN bus or USB host capability is required | Choose for new designs needing modern toolchain support and connectivity; requires PCB redesign and firmware rewrite |
Compared with MC68HC908LK24CFQ, the MC68HC908LJ24CFQ trades EEPROM for IRSCI-making it optimal for IR-configurable displays. Against S9KEAZ128AMLH, it offers lower power and simpler integration for cost-sensitive, LCD-centric applications without connectivity demands.
Availability
MC68HC908LJ24CFQ is available at Aetrix Electronics and suitable for industrial panel meters, medical patient monitors, and smart energy meter displays requiring stable component supply and long-term lifecycle support.
Supply support for MC68HC908LJ24CFQ 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) designed high-reliability microcontrollers for automotive, industrial, and consumer applications with emphasis on mixed-signal integration and low-power operation.
The MC68HC908LJ24CFQ belongs to the HCS08 family, engineered for cost-sensitive, LCD-driven embedded systems requiring real-time control, human interface, and infrared configurability in space-constrained designs.
FAQ
What is the maximum operating frequency of the MC68HC908LJ24CFQ?
The MC68HC908LJ24CFQ supports a maximum bus frequency of 8 MHz, achieved via its Clock Generator Module (CGM) using either internal RC oscillator or external crystal source. This frequency governs instruction execution speed, peripheral timing, and ADC conversion rate, and is specified under VDD = 5.0 V and TA = –40°C to +85°C conditions per Section 24 of the datasheet.
Does the MC68HC908LJ24CFQ include a hardware real-time clock with calendar support?
Yes, the MC68HC908LJ24CFQ integrates a full-featured Real Time Clock (RTC) module with calendar functionality covering year, month, day, hour, minute, and second, plus alarm, chronograph, and calibration registers. It supports 32.768 kHz crystal input and ±1 ppm calibration adjustment, as documented in Section 12 of the MC68HC908LJ24/LK24 datasheet Rev. 2.1.
Can the MC68HC908LJ24CFQ drive a 32-segment LCD directly without external components?
Yes, the MC68HC908LJ24CFQ features an integrated LCD driver capable of static or multiplexed (1/2 or 1/4 duty) operation for up to 32 segments. It generates VLCD bias internally and supports software-selectable contrast and drive strength, eliminating need for external LCD bias ICs or charge pumps in most implementations.
What communication interfaces are supported by the MC68HC908LJ24CFQ?
The MC68HC908LJ24CFQ supports multiple serial interfaces: IRSCI (infrared + UART on PTB0/PTB1), SPI (master/slave on PTC/PTD), and Multi-Master IIC (on PTC). It does not include CAN or USB. The IRSCI module natively handles NEC and RC-5 infrared protocols alongside standard asynchronous serial framing.
Is the FLASH memory in the MC68HC908LJ24CFQ field-programmable and protected?
Yes, the 24 KB FLASH memory in the MC68HC908LJ24CFQ uses Freescale's SuperFlash® technology and supports in-system programming via background debug mode or MON ROM routines. Block protection is implemented through dedicated FLASH Block Protect Registers (FBPROT), allowing selective locking of memory pages against accidental overwrite or unauthorized access.
MC68HC908LJ24CFQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SPI
- Peripherals:
- LCD, LVD, POR, PWM
- Number of I/O:
- 48
- Program Memory Size:
- 24KB (24K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 768 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908LJ24CFQ FAQ
1.How can I place an order for MC68HC908LJ24CFQ through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908LJ24CFQ 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 MC68HC908LJ24CFQ reliable?
The price and inventory of MC68HC908LJ24CFQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908LJ24CFQ is usually 5 days.
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Once your MC68HC908LJ24CFQ 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 MC68HC908LJ24CFQ?
For technical support, including MC68HC908LJ24CFQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908LJ24CFQ requirements.
6.How does Aetrix verify that MC68HC908LJ24CFQ is sourced from the original manufacturer or authorized distributors?
All MC68HC908LJ24CFQ 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 MC68HC908LJ24CFQ meets industry standards.
7.What is the process for return or replacement of MC68HC908LJ24CFQ?
All MC68HC908LJ24CFQ units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908LJ24CFQ, 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 MC68HC908LJ24CFQ part is unused and in its original packaging.
Return procedure for MC68HC908LJ24CFQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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