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NXP Semiconductors MC908QT4ACPE
- Part No.:
- MC908QT4ACPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC908QT4ACPE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
MC908QT4ACPE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 4 KB FLASH, 192 B RAM, 10-bit ADC (8-channel), on-chip oscillator, COP watchdog, and AWU wake-up module - designed for cost-sensitive industrial control, appliance timing, and sensor interface applications.
For engineers reviewing the MC908QT4ACPE datasheet, MC908QT4ACPE pinout, MC908QT4ACPE application, or MC908QT4ACPE equivalent, this page delivers verified technical context, package mapping (DIP-28), security byte configuration ($FFF6–$FFFD), FLASH protection behavior, and validated alternatives for legacy HCS08 migration paths.
Technical Context
The MC908QT4ACPE implements the HCS08 CPU core with 16-bit address space, supports internal RC oscillator (1–8 MHz) and external crystal/RC clock sources, and features a configurable 10-bit ADC with programmable sample time and conversion trigger options.
Its system-level functions include Computer Operating Properly (COP) watchdog with selectable timeout (0.5 ms to 1.0 s), Auto Wakeup Module (AWU) with programmable delay (1–65535 bus cycles), and Low-Voltage Inhibit (LVI) reset at 2.7 V nominal with hysteresis - all operating under single 3.0–5.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit addressing - enables direct access to full 64 KB memory map using indexed addressing modes. |
| FLASH Memory | 4 KB on-chip SuperFlash® - supports in-system programming, mass erase, and block protection via CONFIG register. |
| RAM Size | 192 bytes - sufficient for stack, variables, and small real-time buffers in embedded control loops. |
| ADC Resolution | 10-bit SAR ADC with 8 input channels - provides 1 LSB = VREF/1024 resolution for precision analog sensing. |
| Supply Voltage | 3.0 V to 5.5 V - compatible with standard TTL/CMOS logic levels and industrial power rails. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade environmental operation without derating. |
| Security Feature | Monitor mode entry requires matching eight user-defined bytes at $FFF6–$FFFD; denies entry if ≥5 are zero - prevents unauthorized firmware readout. |
Pinout & Package
MC908QT4ACPE is housed in a 28-pin plastic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch - compatible with through-hole prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Primary DC power terminals; decoupling capacitor required at VDD pin for stable operation. |
| XTAL, EXTAL | Crystal oscillator inputs | Supports external 32.768 kHz watch crystal or 1–8 MHz fundamental-mode crystal for precise timing. |
| PA0–PA7 | Port A bidirectional I/O | 8-bit general-purpose port with pull-up enable; PA0–PA3 double as ADC input channels AD0–AD3. |
| PTA0–PTA3 | Port T A/D trigger and KBI inputs | Function-multiplexed pins supporting keyboard interrupt (KBI), timer input capture, and ADC trigger signals. |
| IRQ | External interrupt request | Active-low edge-triggered interrupt input; supports wake-up from Wait/Stop modes. |
| RESET | Active-low reset input | Asynchronous reset pin; internal POR circuit ensures reliable startup across voltage ramp rates. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip RC oscillator | Factory-trimmed 1–8 MHz internal clock source eliminates need for external crystal in cost-sensitive designs. |
| FLASH block protection | Configurable write/erase lock per 512-byte block - prevents accidental overwrites during field firmware updates. |
| Auto Wakeup Module (AWU) | Programmable wake-up interval (1–65535 bus cycles) enables ultra-low-power sleep with deterministic resume timing. |
| Low-Voltage Inhibit (LVI) | Hardware reset activation at 2.7 V ±0.1 V with 0.2 V hysteresis - ensures safe shutdown before brownout corruption. |
| Monitor mode security | User-programmable 8-byte security key at $FFF6–$FFFD blocks unauthorized FLASH readout during debug sessions. |
Applications
| Home Appliance Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Microcontroller manages motor speed, temperature feedback, and user interface in washing machines and microwaves. IC Role / Device Role / Timing Role: Primary system controller executing real-time state machine, reading thermistor/NTC inputs via ADC, and driving triac/relay outputs. Use Value: Integrated 10-bit ADC and AWU reduce BOM count by eliminating external converters and wake-up timers. |
Use Scenario: Reads analog pressure, flow, or humidity sensors in factory automation systems with minimal external components. IC Role / Device Role / Timing Role: Signal acquisition node converting sensor output to digital values, applying linearization, and transmitting via UART or SPI. Use Value: On-chip LVI and COP ensure reliable operation in electrically noisy plant environments with unstable power. |
| Smart Power Outlet | Legacy Equipment Retrofit |
Use Scenario: Controls AC load switching, monitors current draw, and implements energy metering in intelligent power strips. IC Role / Device Role / Timing Role: System-on-chip managing zero-cross detection, RMS calculation, and safety-critical overload shutdown. Use Value: 4 KB FLASH accommodates both control firmware and calibration tables; security bytes protect proprietary algorithms. |
Use Scenario: Replaces obsolete 68HC11 or 68HC05 controllers in aging industrial panels with minimal PCB modification. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade offering enhanced FLASH endurance and debug security. Use Value: DIP-28 package and identical peripheral register map simplify hardware redesign and software porting effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908QT4CDWE | Same core and peripherals, but in SOIC-28 package with wider operating temperature (–40 °C to +105 °C). | Suitable for surface-mount production and extended-temperature industrial deployments. | Select when automated assembly or higher thermal margin is required; pinout identical but footprint differs. |
| MC9S08QG4CDTE | HCS08 derivative with same FLASH/RAM, added SCI/I²C, and enhanced COP with windowed timeout mode. | Better suited for systems requiring serial communication or tighter watchdog supervision. | Choose for new designs needing protocol support; not pin-compatible due to different pin assignment for SCI signals. |
Compared with MC908QT4ACPE, MC908QT4CDWE offers identical functionality in SOIC packaging for SMT lines, while MC9S08QG4CDTE adds communication peripherals at the cost of pinout rework - making the former ideal for drop-in replacement and the latter for feature-extended upgrades.
Availability
MC908QT4ACPE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, and smart power outlet applications requiring stable component supply and long-term lifecycle support.
Supply support for MC908QT4ACPE 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) pioneered mixed-signal microcontrollers for industrial and automotive markets, emphasizing robustness, low-power design, and toolchain integration.
The MC908QT4ACPE belongs to the HCS08 QTA family - engineered for cost-effective, high-reliability control in appliances, power tools, and legacy equipment where flash security and analog integration are critical.
FAQ
What is the maximum ADC sampling rate supported by the MC908QT4ACPE?
The MC908QT4ACPE ADC achieves up to 50 kSPS (kilo-samples per second) at 10-bit resolution when using the internal bus clock at 8 MHz and minimum sample time settings. This rate assumes optimal configuration of ADCLK register and no pipeline stalls - actual throughput depends on software overhead and channel sequencing.
Does the MC908QT4ACPE support in-circuit debugging via BDM?
Yes, the MC908QT4ACPE supports Background Debug Mode (BDM) through the BKGD pin, enabling full read/write access to memory and registers during runtime. Monitor mode entry requires correct security bytes at $FFF6–$FFFD, and BDM operation is disabled if security is enabled and mismatched.
How is FLASH memory protected against accidental erasure on the MC908QT4ACPE?
FLASH protection on the MC908QT4ACPE is controlled by the FLASH Block Protect Register (FBPROT). Setting FBPROT bits locks individual 512-byte blocks from program/erase operations until cleared via mass erase - preventing unintended firmware corruption during development or field updates.
What oscillator options are available for the MC908QT4ACPE?
The MC908QT4ACPE supports three clock sources: internal RC oscillator (factory-trimmed 1–8 MHz), external crystal (32.768 kHz or 1–8 MHz), and external RC network. Clock selection is managed via CONFIG register bits, and automatic failover from external to internal source is supported during XTAL failure.
Can the MC908QT4ACPE operate reliably at 3.3 V supply?
Yes, the MC908QT4ACPE is fully specified for operation from 3.0 V to 5.5 V. At 3.3 V, it maintains full functionality including ADC accuracy, COP timing, and FLASH programming - provided the internal oscillator is configured for ≤4 MHz or external clock is used within spec.
MC908QT4ACPE 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 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC908QT4ACPE FAQ
1.How can I place an order for MC908QT4ACPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908QT4ACPE 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 MC908QT4ACPE reliable?
The price and inventory of MC908QT4ACPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908QT4ACPE is usually 5 days.
3.What payment methods are accepted for MC908QT4ACPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908QT4ACPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908QT4ACPE?
MC908QT4ACPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908QT4ACPE 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 MC908QT4ACPE?
For technical support, including MC908QT4ACPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908QT4ACPE requirements.
6.How does Aetrix verify that MC908QT4ACPE is sourced from the original manufacturer or authorized distributors?
All MC908QT4ACPE 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 MC908QT4ACPE meets industry standards.
7.What is the process for return or replacement of MC908QT4ACPE?
All MC908QT4ACPE units undergo pre-shipment inspection (PSI). If there is an issue with MC908QT4ACPE, 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 MC908QT4ACPE part is unused and in its original packaging.
Return procedure for MC908QT4ACPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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