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NXP Semiconductors MC908LJ12CFUER
- Part No.:
- MC908LJ12CFUER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 64-QFP
- Datasheet:
-
MC908LJ12CFUER.pdf
- Description:
- IC MCU 8BIT 12KB FLASH 64QFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
MC908LJ12CFUER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 core microcontroller with 12 KB on-chip FLASH, 512 B RAM, integrated LCD driver (up to 18 segments), real-time clock (RTC), IRSCI serial interface, and 8-channel 10-bit ADC. It operates at up to 8 MHz bus frequency and supports low-power stop/wait modes for battery-powered instrumentation.
For engineers reviewing the MC908LJ12CFUER datasheet, MC908LJ12CFUER pinout, MC908LJ12CFUER application, or MC908LJ12CFUER equivalent, this page delivers verified technical context, package-validated pin functions, key MCU peripherals (RTC, IRSCI, LCD, ADC), and direct alternative options for legacy HCS08-based metering and control designs.
Technical Context
The MC908LJ12CFUER implements the HCS08 CPU core with a 16-bit address space, supporting indexed, extended, and relative addressing. Its Clock Generator Module (CGM) includes a PLL for internal clock multiplication and selectable oscillator sources (internal RC, external crystal, or ceramic resonator).
System integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP), interrupt vectors, and low-power modes; plus dedicated modules for RTC calendar/alarm functions, infrared serial communication (IRSCI) with built-in encoder/decoder, and SPI master/slave operation - all accessible via memory-mapped registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 16-bit address bus and 8-level hardware stack - enables deterministic real-time control in resource-constrained systems. |
| Memory | 12 KB on-chip FLASH (programmable in-system), 512 B RAM - sufficient for firmware with RTC, LCD, and IR protocol stacks without external memory. |
| ADC | 8-channel 10-bit successive-approximation ADC with VREFH/VREFL inputs - supports precision analog sensing (e.g., temperature, voltage) in portable meters. |
| LCD Driver | Integrated static/dynamic LCD controller driving up to 18 segments (BP0–BP2, FP0/BP3, FP1–FP18) - eliminates external segment drivers in display-centric applications. |
| RTC | Full-calendar RTC with alarm, chronograph, and timebase interrupts - maintains accurate timekeeping during stop mode using 32.768 kHz crystal input. |
| Serial Interfaces | IRSCI (infrared + SCI) with programmable baud rate and break detection, plus SPI master/slave - enables contactless data transfer and sensor network interfacing. |
| Supply Voltage | 2.7–5.5 V operation - compatible with single-cell Li-ion, 3×AA, or regulated 3.3/5 V rails in industrial and consumer devices. |
Pinout & Package
MC908LJ12CFUER is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, measuring 10 mm × 10 mm. Pin assignments are validated per Freescale document MC68HC908LJ12/D Rev. 2.1, Sections 1.5–1.6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD/VSS for digital logic; VDDA/VSSA (pins 3, 4) for analog/ADC/LCD reference stability. |
| OSC1, OSC2 | Crytal/resonator connection | Supports 32.768 kHz crystal for RTC and up to 4 MHz crystal for main system clock - enables dual-frequency timing architecture. |
| RST | Active-low reset input | Asynchronous external reset pin; also accepts internal POR, LVI, COP, and illegal opcode resets - ensures robust system initialization. |
| PTA0–PTA7 | Port A I/O | 8-bit general-purpose bidirectional port with pull-up enable - used for keypad scanning, status LEDs, or GPIO expansion. |
| PTB0/TxD, PTB1/RxD | IRSCI serial I/O | Dedicated IRSCI transmit/receive pins with integrated IR modulation capability - simplifies remote control receiver implementation. |
| BP0–BP2, FP0/BP3, FP1–FP18 | LCD backplane/frontplane | 21 dedicated LCD segment/common pins supporting multiplexed static/dynamic drive - directly interfaces to 4-digit alphanumeric LCDs. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Built-in 2 KB ROM with flash programming routines (PRGRNGE, ERARNGE), UART bootloader, and security lock - enables field firmware updates without external programmer. |
| Computer Operating Properly (COP) | Configurable watchdog timer with independent clock source - prevents runaway code in safety-critical embedded control loops. |
| Low-Voltage Inhibit (LVI) | Programmable brown-out detection (2.5 V or 3.0 V threshold) with interrupt and reset output - protects FLASH integrity during power dips. |
| Timer Interface Module (TIM) | 16-bit free-running counter with 4 input capture/output compare channels and PWM generation - supports motor control, pulse measurement, and LED dimming. |
| Keyboard Interrupt (KBI) | 8-input matrix scan with wake-from-stop capability on any key press - extends battery life in handheld instruments with keypad UI. |
Applications
| Energy Metering | Industrial Panel Meters |
|---|---|
|
Use Scenario: Residential electricity meter with LCD display, tamper detection, and IR data upload. IC Role / Device Role / Timing Role: Primary system controller executing metering algorithm, driving 4-digit LCD, logging kWh via RTC timestamp, and transmitting readings via IRSCI. Use Value: Integrated RTC and IRSCI eliminate discrete timing and communication ICs; 12 KB FLASH accommodates metrology firmware and IR protocol stack. |
Use Scenario: DIN-rail mounted process monitor displaying temperature, pressure, and flow with local keypad and IR configuration. IC Role / Device Role / Timing Role: Central MCU handling analog sensor inputs (via 10-bit ADC), updating segmented LCD, responding to KBI keypresses, and enabling field setup via IRSCI. Use Value: On-chip LCD driver reduces BOM cost; KBI wake-from-stop extends runtime on backup battery; IRSCI avoids wired configuration ports. |
| Portable Medical Devices | Smart Thermostats |
|
Use Scenario: Battery-powered blood glucose meter with LCD readout, strip detection, and IR result export. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring ADC measurements, validating test strips, displaying results on LCD, and exporting via IRSCI to clinic receivers. Use Value: 2.7–5.5 V operation supports coin-cell or AAA battery packs; RTC provides timestamped log entries; IRSCI meets HIPAA-compliant wireless transfer requirements. |
Use Scenario: Programmable HVAC thermostat with ambient sensor inputs, 4-segment LCD, scheduling, and IR remote pairing. IC Role / Device Role / Timing Role: Main controller managing schedule logic (RTC calendar), reading thermistor/NTC inputs (ADC), updating LCD, and interpreting IR remote commands (IRSCI). Use Value: Integrated RTC enables precise daily/weekly scheduling; IRSCI decodes NEC/RC-5 protocols without external decoder IC; low-power stop mode extends battery life >1 year. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908LJ12CDTE | Same HCS08 core, 12 KB FLASH, 512 B RAM, but in 52-pin TQFP package with reduced LCD segment count (12 segments vs. 18) and no BP2 pin. | Suitable for simpler LCD displays (e.g., 3-digit) where board space is constrained and full 18-segment drive is unnecessary. | Select MC908LJ12CDTE only when pin count and LCD complexity are reduced; verify PTx pin mapping and segment layout compatibility. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+ MCU with 128 KB FLASH, 16 KB RAM, 12-bit ADC, and no native IRSCI or LCD driver - requires external components for equivalent functionality. | Targets next-generation designs needing higher performance, connectivity (CAN, USB), or RTOS support - not a drop-in replacement. | Choose S9KEAZ128AMLH for new designs requiring scalability beyond HCS08 limits; expect PCB redesign and firmware migration effort. |
Compared with MC908LJ12CFUER, MC908LJ12CDTE offers identical core functionality in a smaller package but sacrifices LCD drive capability, while S9KEAZ128AMLH provides modern ARM architecture and expanded memory at the cost of peripheral integration and legacy code compatibility.
Availability
MC908LJ12CFUER is available at Aetrix Electronics and suitable for energy metering, industrial panel meters, portable medical devices, and smart thermostats requiring stable component supply across long-lifecycle industrial programs.
Supply support for MC908LJ12CFUER 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, formed from the spin-off of Freescale Semiconductor in 2015.
The MC908LJ12CFUER belongs to the legacy HCS08 microcontroller family, designed specifically for cost-sensitive, low-power embedded systems requiring integrated LCD, RTC, and infrared communication - especially in utility metering and human-interface devices.
FAQ
What is the maximum operating frequency of the MC908LJ12CFUER?
The MC908LJ12CFUER supports a maximum bus frequency of 8 MHz, achieved via its internal Clock Generator Module (CGM) PLL when driven by a 4 MHz crystal or external clock source. This frequency governs instruction execution speed, peripheral timing, and ADC conversion rate - all validated in Freescale's MC68HC908LJ12/D Rev. 2.1 electrical specifications section.
Does the MC908LJ12CFUER support in-system programming (ISP)?
Yes, the MC908LJ12CFUER supports in-system programming via its built-in Monitor ROM (MON), which contains flash programming routines (PRGRNGE, ERARNGE) and a UART-based bootloader. Programming is performed through the IRSCI interface using standard Freescale BDM protocol - no external programmer required for field firmware updates.
Can the MC908LJ12CFUER drive a 4-digit 7-segment LCD display?
Yes, the MC908LJ12CFUER can directly drive a 4-digit 7-segment LCD display using its integrated LCD controller with up to 18 segments (BP0–BP2, FP0/BP3, FP1–FP18). Configuration is done via SIM and LCD control registers; no external bias or segment drivers are needed - confirmed in Section 16 of the MC68HC908LJ12/D datasheet.
What low-power modes does the MC908LJ12CFUER support?
The MC908LJ12CFUER supports Wait Mode (CPU halted, peripherals active) and Stop Mode (all clocks stopped except RTC oscillator), both configurable via the SIM module. In Stop Mode, current consumption drops to ~0.5 µA (typical) while retaining RAM and RTC operation - enabling multi-year battery life in portable applications per Section 9.7 of the datasheet.
Is the MC908LJ12CFUER RoHS compliant and lead-free?
Yes, the MC908LJ12CFUER is RoHS compliant and lead-free, as confirmed in Freescale's ordering information (Section 25) and packaging documentation. The "FUER" suffix denotes a lead-free, green (halogen-free), 64-pin QFP package conforming to JEDEC standards - suitable for modern environmental compliance requirements.
MC908LJ12CFUER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-QFP
- Series:
- HC08
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- M68HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SPI
- Peripherals:
- LCD, LVD, POR, PWM
- Number of I/O:
- 54
- Program Memory Size:
- 12KB (12K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 6x10b SAR
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908LJ12CFUER FAQ
1.How can I place an order for MC908LJ12CFUER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908LJ12CFUER 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 MC908LJ12CFUER reliable?
The price and inventory of MC908LJ12CFUER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908LJ12CFUER is usually 5 days.
3.What payment methods are accepted for MC908LJ12CFUER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908LJ12CFUER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908LJ12CFUER?
MC908LJ12CFUER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908LJ12CFUER 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 MC908LJ12CFUER?
For technical support, including MC908LJ12CFUER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908LJ12CFUER requirements.
6.How does Aetrix verify that MC908LJ12CFUER is sourced from the original manufacturer or authorized distributors?
All MC908LJ12CFUER 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 MC908LJ12CFUER meets industry standards.
7.What is the process for return or replacement of MC908LJ12CFUER?
All MC908LJ12CFUER units undergo pre-shipment inspection (PSI). If there is an issue with MC908LJ12CFUER, 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 MC908LJ12CFUER part is unused and in its original packaging.
Return procedure for MC908LJ12CFUER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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