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NXP Semiconductors MC908JL3EMPE
- Part No.:
- MC908JL3EMPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MC908JL3EMPE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,861
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Product details
Overview
MC908JL3EMPE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 4 KB FLASH, 192 B RAM, 8-channel 8-bit ADC, and integrated TIM module with PWM and input capture. It operates at up to 8 MHz bus frequency, supports 5 V operation, and targets embedded control in cost-sensitive industrial and consumer systems such as motor control interfaces and sensor signal conditioning.
For engineers reviewing the MC908JL3EMPE datasheet, MC908JL3EMPE pinout, MC908JL3EMPE application, or MC908JL3EMPE equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases - all grounded in Freescale's official MC68H(R)C908JL3 Rev. 1.1 Technical Data document.
Technical Context
The MC908JL3EMPE implements the HCS08 CPU core with a 16-bit address bus, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) provides clock generation from internal RC or external crystal oscillator, configurable reset sources (POR, COP, LVI), and low-power Wait/Stop modes with wake-up via IRQ, KBI, or TIM.
It integrates a 16-bit Timer Interface Module (TIM) with two channels supporting input capture, output compare, and buffered/unbuffered PWM - plus an 8-channel Analog-to-Digital Converter with software-selectable conversion time (16–64 µs) and built-in reference voltage options (VDD or internal bandgap).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 12-clock-cycle instruction execution baseline |
| FLASH Memory | 4 KB on-chip FLASH with block erase, mass erase, and program operations; supports in-system programming |
| RAM Size | 192 bytes of on-chip RAM for data storage and stack operations |
| ADC Resolution | 8-bit successive-approximation ADC with 8 selectable input channels and programmable conversion timing |
| Timer Channels | Two independent 16-bit TIM channels with input capture, output compare, and PWM generation capability |
| Supply Voltage | 4.5 V to 5.5 V DC operation - validated for stable performance across industrial temperature range (−40°C to +85°C) |
| I/O Pins | 16 general-purpose I/O pins distributed across Ports A, B, and D with configurable pull-ups and data direction control |
Pinout & Package
MC908JL3EMPE is housed in a 28-pin Plastic Dual In-line Package (PDIP) with 0.600-inch body width and standard through-hole mounting. Pin assignments follow Freescale's MC68H(R)C908JL3 Rev. 1.1 Figure 1-2 and Section 1.5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main 5 V supply input; decoupling capacitor required near pin for noise immunity |
| VSS | Ground | Digital ground reference; must be connected to system common ground plane |
| OSC1 | Clock Input | Crystal amplifier input for external quartz crystal (1–8 MHz) or ceramic resonator connection |
| OSC2/PTA6/RCCLK | Clock Output / I/O / RC Clock | Crystal amplifier output; also serves as PTA6 general-purpose I/O or RC oscillator clock source |
| IRQ | Interrupt Request | Active-low external interrupt input with edge-triggered detection and priority handling in SIM |
| RESET | Reset Input | Active-low hardware reset pin; initiates full system initialization including register clearing and vector fetch |
| PTA0–PTA7 | Port A I/O | 8-bit bidirectional port with individual direction control (DDRA) and pull-up enable (PTAPUE) |
| PTB0–PTB7 | Port B I/O | 8-bit bidirectional port with direction control (DDRB); PTB0–PTB3 support keyboard interrupt (KBI) inputs |
| PTD0–PTD7 | Port D I/O | 8-bit bidirectional port with direction control (DDRD); PTD0–PTD3 serve as ADC input channels AD0–AD3 |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | On-chip 256-byte ROM enabling serial bootloader functionality via UART interface without external programmer |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms to 1.0 s) to recover from software lockup or infinite loops |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detection circuit that forces reset when VDD drops below 4.2 V (typical), preventing erratic operation |
| Keyboard Interrupt Module (KBI) | Hardware scan logic for up to 8-key matrix with automatic wake-up from Wait/Stop mode on keypress event |
| Break Module | Dedicated debug interface supporting single-step execution, breakpoint setting, and memory inspection during development |
Applications
| Motor Control Interface | Sensor Signal Conditioning |
|---|---|
Use Scenario: Low-cost fan speed controller using potentiometer input and PWM-driven MOSFET gate. IC Role / Device Role / Timing Role: MCU executing closed-loop duty-cycle adjustment based on analog feedback and generating precise PWM output. Use Value: Integrated 8-bit ADC and dual-channel TIM eliminate need for external converters or timer ICs, reducing BOM count and PCB area. |
Use Scenario: Temperature monitoring node converting thermistor voltage to digital readings for display or transmission. IC Role / Device Role / Timing Role: Signal acquisition engine performing periodic ADC sampling and scaling via firmware lookup table. Use Value: On-chip 8-channel ADC with internal reference enables direct ratiometric measurement without external voltage reference IC. |
| Industrial Panel Keypad | Consumer Appliance Timer |
Use Scenario: Microwave oven control panel detecting button presses and managing display backlight timing. IC Role / Device Role / Timing Role: Keyboard scanner and state machine controller with KBI wake-up and TIM-based debounce timing. Use Value: Hardware KBI module reduces CPU load during idle periods and ensures reliable key detection even in low-power Stop mode. |
Use Scenario: Washing machine cycle timer managing motor sequencing, valve actuation, and LED status indicators. IC Role / Device Role / Timing Role: Real-time task scheduler using COP watchdog for fault recovery and TIM interrupts for precise interval timing. Use Value: Built-in COP and low-power modes ensure deterministic behavior and energy efficiency over multi-hour run cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908JK3ECD | Same HCS08 core but with 2 KB FLASH, no ADC, and 20-pin SOIC package - lower peripheral integration | Limited to simpler control tasks without analog sensing or complex timing; lacks KBI and MON ROM | Select when cost and board space are critical and ADC/KBI are unnecessary |
| MC9RS08KA2CSC | RSA08 core, 2 KB FLASH, 128 B RAM, 10-bit ADC, 16-pin SOIC - newer architecture with enhanced debug and lower power | Better ADC resolution and active current (1.3 mA @ 10 MHz vs. 4.5 mA), but requires toolchain migration | Prefer for new designs requiring higher precision or longer battery life; not drop-in compatible |
Compared with MC908JL3EMPE, MC908JK3ECD offers reduced memory and no analog capability - suitable only for basic digital control. MC9RS08KA2CSC delivers improved ADC accuracy and lower active current but mandates firmware rework due to architectural differences and non-pin-compatible packaging.
Availability
MC908JL3EMPE is available at Aetrix Electronics and suitable for industrial motor control, appliance timing, sensor interface, and keypad management applications requiring stable component supply and long-term manufacturability.
Supply support for MC908JL3EMPE 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) is a global leader in embedded processing solutions, delivering high-reliability microcontrollers for automotive, industrial, and consumer markets.
The MC68HC908JL3 belongs to Freescale's legacy HCS08 family - designed specifically for cost-optimized, low-pin-count embedded control where Flash programmability, integrated peripherals, and robust reset/watchdog features are essential.
FAQ
What is the maximum operating frequency of the MC908JL3EMPE?
The MC908JL3EMPE supports a maximum bus frequency of 8 MHz when driven by an external crystal oscillator (1–8 MHz range). Its internal RC oscillator option runs at 4.2 MHz nominal and is factory-trimmed to ±5% accuracy. The CPU executes instructions at one bus cycle per instruction for most operations, enabling deterministic real-time response in timing-critical applications like PWM generation and ADC sampling.
Does the MC908JL3EMPE include a hardware watchdog timer?
Yes, the MC908JL3EMPE includes a Computer Operating Properly (COP) watchdog timer with user-selectable timeout intervals ranging from 0.5 ms to 1.0 s. The COP is enabled by default after reset and must be serviced regularly via software writes to the COPCTL register to prevent system reset. This feature ensures fail-safe recovery from software hangs or unexpected code flow deviations in safety-conscious applications.
Can the MC908JL3EMPE operate from a 3.3 V supply?
No, the MC908JL3EMPE is specified only for 4.5 V to 5.5 V operation per Section 18.4 of the MC68H(R)C908JL3 Rev. 1.1 datasheet. It does not support 3.3 V supply rails. Attempting to power the device below 4.5 V may cause unreliable operation, undefined reset behavior, or failure to execute instructions correctly due to insufficient voltage margin for internal logic thresholds.
How many ADC input channels does the MC908JL3EMPE support?
The MC908JL3EMPE integrates an 8-bit successive-approximation ADC with eight selectable input channels (AD0–AD7), mapped to Port D pins PTD0–PTD3 and Port A pins PTA0–PTA3. Conversion time is software-configurable between 16 µs and 64 µs, and the ADC supports both VDD and internal bandgap reference voltage selection - enabling flexible ratiometric or absolute measurements depending on system requirements.
Is there on-chip debug support for the MC908JL3EMPE?
Yes, the MC908JL3EMPE includes a dedicated Break Module supporting hardware breakpoints, single-stepping, and memory/register inspection via the BKGD pin. This module works in conjunction with Freescale's BDM (Background Debug Mode) protocol and is fully supported by CodeWarrior Development Studio. No external emulator is required for basic debugging, significantly accelerating firmware bring-up and validation cycles for the MC908JL3EMPE.
MC908JL3EMPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 23
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC908JL3EMPE FAQ
1.How can I place an order for MC908JL3EMPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908JL3EMPE 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 MC908JL3EMPE reliable?
The price and inventory of MC908JL3EMPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908JL3EMPE is usually 5 days.
3.What payment methods are accepted for MC908JL3EMPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908JL3EMPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908JL3EMPE?
MC908JL3EMPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908JL3EMPE 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 MC908JL3EMPE?
For technical support, including MC908JL3EMPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908JL3EMPE requirements.
6.How does Aetrix verify that MC908JL3EMPE is sourced from the original manufacturer or authorized distributors?
All MC908JL3EMPE 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 MC908JL3EMPE meets industry standards.
7.What is the process for return or replacement of MC908JL3EMPE?
All MC908JL3EMPE units undergo pre-shipment inspection (PSI). If there is an issue with MC908JL3EMPE, 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 MC908JL3EMPE part is unused and in its original packaging.
Return procedure for MC908JL3EMPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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