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NXP Semiconductors MC68HC908QT4MPE
- Part No.:
- MC68HC908QT4MPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC68HC908QT4MPE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
MC68HC908QT4MPE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using internal RC oscillator or external crystal, and targets low-cost embedded control in appliance motor drives and industrial sensor interfaces.
For engineers reviewing the MC68HC908QT4MPE datasheet, MC68HC908QT4MPE pinout, MC68HC908QT4MPE application, or MC68HC908QT4MPE equivalent, key selection criteria include its 16-pin SOIC package, internal oscillator trim capability, COP watchdog, LVI reset threshold, and KBI keyboard interrupt support for human-interface systems.
Technical Context
The MC68HC908QT4MPE implements the M68HC08 CPU core with 16-bit address space, supporting WAIT/STOP low-power modes and a configurable Computer Operating Properly (COP) watchdog timer with selectable timeout intervals. Its System Integration Module (SIM) manages clock sources, reset generation, and interrupt vectoring.
It integrates an 8-channel single-ended analog-to-digital converter with programmable sample time and conversion trigger options, plus a Keyboard Interrupt Module (KBI) supporting edge-sensitive wake-up on up to 8 pins. The internal RC oscillator provides factory-trimmed operation at 4.0 MHz ±2% over temperature and voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M68HC08 8-bit CPU with 16-bit addressing and 59-instruction set |
| FLASH Memory | 4 KB on-chip FLASH with block protection and in-system programmability |
| RAM Size | 192 bytes of on-chip RAM for data and stack storage |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels and software-selectable reference |
| Max Bus Frequency | 8 MHz - determines instruction execution speed and peripheral timing budgets |
| Oscillator Options | Internal RC (4 MHz ±2%), external crystal (up to 8 MHz), or external clock source |
| Package Type | 16-pin SOIC (Small Outline Integrated Circuit), 300 mil width, RoHS-compliant |
Pinout & Package
MC68HC908QT4MPE is housed in a 16-pin SOIC package (case #751A-03) with 1.27 mm pitch, 10.3 mm × 7.5 mm body size, and standard JEDEC MS-012AC footprint. Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Primary 5 V supply input; must be decoupled locally for noise immunity |
| VSS | Ground | Digital ground reference; requires low-impedance connection to system GND plane |
| OSC1 | Clock Input | Crystal amplifier input; connects to one terminal of external quartz crystal or ceramic resonator |
| OSC2/PTA4/BUSCLKX4 | Multi-function Pin | Crystal amplifier output, Port A bit 4, or 4× bus clock output - function selected via CONFIG register |
| PTA0–PTA7 | I/O Port A | 8-bit bidirectional port with individual direction control; PTA0–PTA3 support KBI wake-up |
| PTB0–PTB1 | I/O Port B | 2-bit bidirectional port; PTB0 supports IRQ external interrupt input |
| RESET | Active-Low Reset | Asynchronous reset input; internal pull-up enables reset via external pushbutton or supervisor IC |
| IRQ | External Interrupt | Edge-triggered interrupt input with configurable polarity; shares pin with PTB0 |
Key Features
| Feature | Design Value |
|---|---|
| Internal Oscillator Trim | Factory-trimmed 4 MHz RC oscillator with OSCTRIM register for ±10% fine-tuning across voltage/temperature |
| COP Watchdog Timer | Configurable timeout (1.0–16.4 ms) with independent clock source prevents firmware lockup in safety-critical loops |
| Low-Voltage Inhibit (LVI) | Programmable reset threshold (4.25 V or 3.7 V) with hysteresis ensures reliable operation during brownout conditions |
| Keyboard Interrupt (KBI) | Hardware scan engine on PTA0–PTA3 enables wake-from-STOP on keypress without CPU polling overhead |
| FLASH Block Protection | FLBPR register allows locking of top 256-byte FLASH block to prevent accidental overwrite of boot code |
Applications
| Appliance Motor Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Fan speed regulation in HVAC blower units using PWM-driven DC motors. IC Role / Device Role / Timing Role: MCU executes closed-loop PID algorithm, generates 8-bit PWM via TIM module, reads tachometer feedback via IRQ pin. Use Value: On-chip ADC measures thermistor temperature; KBI wakes MCU from STOP mode when user adjusts control knob. | Use Scenario: Analog signal conditioning and digitization for pressure transducers in factory automation. IC Role / Device Role / Timing Role: ADC samples 4–20 mA loop signals; COP monitors main control loop; LVI prevents erratic behavior during line sags. Use Value: Internal 4 MHz oscillator eliminates external crystal cost; 4 KB FLASH accommodates calibration tables and firmware updates. |
| Consumer Remote Control Hub | Smart Power Outlet Monitoring |
Use Scenario: IR receiver demodulation and button matrix scanning in universal remote base station. IC Role / Device Role / Timing Role: KBI detects keypress events; TIM captures IR carrier frequency; PTA pins drive LED indicators. Use Value: Low-power STOP mode draws <1 µA; internal oscillator avoids crystal startup delay during rapid wake-up cycles. | Use Scenario: Real-time current/voltage monitoring and relay control in energy-management outlets. IC Role / Device Role / Timing Role: ADC reads shunt resistor voltage; COP guards relay activation logic; IRQ triggers on zero-cross detection. Use Value: FLASH memory stores energy consumption logs; 192 B RAM holds rolling averages and communication buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QY4MPE | Same core and peripherals but includes 4-channel 10-bit ADC instead of 8-channel 8-bit ADC; adds TCLK pin for external timer clock input | Better suited for higher-precision analog sensing where 10-bit resolution improves dynamic range | Select QY4 variant when ADC accuracy >8-bit is required; QT4 remains optimal for cost-sensitive 8-bit sensor nodes |
| MC9RS08KA2CFD | Successor RS08 core with 2 KB FLASH, 128 B RAM, and enhanced COP; lacks KBI but adds I²C interface | Targets newer designs requiring serial communication or lower power; not drop-in compatible due to different instruction set and register map | Choose KA2 for new low-power designs needing I²C; retain QT4 for legacy code compatibility and keyboard wake-up capability |
Compared with MC68HC908QY4MPE, the MC68HC908QT4MPE trades ADC resolution for channel count and omits TCLK-making it more suitable for multi-sensor polling. Versus MC9RS08KA2CFD, it offers mature toolchain support and KBI functionality absent in the RS08 family.
Availability
MC68HC908QT4MPE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, and consumer remote control hub applications requiring stable component supply and long-term manufacturing continuity.
Supply support for MC68HC908QT4MPE 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 company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity and embedded processing solutions.
The MC68HC908QT4MPE belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in white goods, industrial controls, and human-interface devices.
FAQ
What is the maximum operating frequency of the MC68HC908QT4MPE?
The MC68HC908QT4MPE supports a maximum bus clock frequency of 8 MHz. This is achieved either by using an external crystal up to 8 MHz or by enabling the internal RC oscillator's 4× PLL mode (BUSCLKX4), which multiplies the factory-trimmed 4 MHz internal oscillator to 8 MHz. The actual achievable frequency depends on supply voltage and temperature per Electrical Specifications Table 16-1.
Does the MC68HC908QT4MPE support in-circuit programming?
Yes, the MC68HC908QT4MPE supports in-system programming (ISP) via the MON (Monitor) mode using a single-wire background debug interface. Programming requires applying high-voltage (≥7 V) to the RESET pin while holding the device in monitor mode, then using compatible tools such as P&E Micro's Cyclone or Freescale's DEMO908QT4 evaluation board. No external programmer socket is needed.
What is the purpose of the OSCTRIM register in the MC68HC908QT4MPE?
The OSCTRIM register ($FFC0) in the MC68HC908QT4MPE allows runtime adjustment of the internal RC oscillator frequency by ±10% in 16 discrete steps. This enables compensation for voltage and temperature drift, ensuring timing-critical functions like UART baud generation or ADC sampling remain within specification across operating conditions without requiring an external crystal.
Can the MC68HC908QT4MPE operate from a 3.3 V supply?
No, the MC68HC908QT4MPE is specified only for 5.0 V ±10% operation (4.5 V to 5.5 V). Its electrical characteristics-including ADC reference, I/O thresholds, and internal oscillator performance-are characterized exclusively at 5 V. Operating below 4.5 V risks LVI reset activation, unstable FLASH programming, or undefined CPU behavior per Section 16.1 of the datasheet.
How many interrupt vectors does the MC68HC908QT4MPE support?
The MC68HC908QT4MPE supports 16 interrupt vectors, including reset, IRQ, keyboard interrupt (KBI), ADC conversion complete, timer overflow, COP timeout, and LVI reset. Each vector maps to a fixed 16-bit address in the interrupt vector table located at $FFDC–$FFFF. The SIM module prioritizes interrupts based on vector address order, with lowest address having highest priority.
MC68HC908QT4MPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- HC08
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 5
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC68HC908QT4MPE FAQ
1.How can I place an order for MC68HC908QT4MPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QT4MPE 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 MC68HC908QT4MPE reliable?
The price and inventory of MC68HC908QT4MPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QT4MPE is usually 5 days.
3.What payment methods are accepted for MC68HC908QT4MPE?
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MC68HC908QT4MPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QT4MPE 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 MC68HC908QT4MPE?
For technical support, including MC68HC908QT4MPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QT4MPE requirements.
6.How does Aetrix verify that MC68HC908QT4MPE is sourced from the original manufacturer or authorized distributors?
All MC68HC908QT4MPE 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 MC68HC908QT4MPE meets industry standards.
7.What is the process for return or replacement of MC68HC908QT4MPE?
All MC68HC908QT4MPE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QT4MPE, 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 MC68HC908QT4MPE part is unused and in its original packaging.
Return procedure for MC68HC908QT4MPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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