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NXP Semiconductors MC908QT4AMDWER
- Part No.:
- MC908QT4AMDWER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC908QT4AMDWER.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
MC908QT4AMDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated ADC10, AWU, COP watchdog, and LVI voltage monitor. It operates at up to 8 MHz bus frequency, supports in-circuit programming via monitor mode, and targets low-power embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MC908QT4AMDWER datasheet, MC908QT4AMDWER pinout, MC908QT4AMDWER application, or MC908QT4AMDWER equivalent, key selection criteria include its 16-pin SOIC-W package, internal RC oscillator with trim register, security byte validation ($FFF6–$FFFD), and compatibility with legacy HC08 development tools and debug interfaces.
Technical Context
The MC908QT4AMDWER implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its memory map includes 4 KB FLASH (with block protection and mass erase), 192 B RAM, and 32 B EEPROM emulation via FLASH.
Peripherals include a 10-bit ADC with 4 input channels, Auto Wakeup Module with programmable timeout, Computer Operating Properly (COP) watchdog with selectable timeout, Low-Voltage Inhibit (LVI) reset at 2.5 V ±0.1 V, and keyboard interrupt support on up to 4 pins. All modules operate under Wait/Stop low-power modes with configurable wake sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU, upward-compatible with HC08 instruction set |
| FLASH Memory | 4 KB - supports in-system programming, mass erase, and block protection |
| RAM | 192 bytes - used for stack, variables, and temporary data storage |
| ADC Resolution | 10-bit - provides 1024 quantization levels for analog sensor interfacing |
| Supply Voltage | 2.7–5.5 V - enables operation across battery-powered and industrial rail voltages |
| Max Bus Frequency | 8 MHz - determines instruction throughput and peripheral timing margins |
| LVI Threshold | 2.5 V ±0.1 V - triggers reset before logic corruption occurs in brown-out conditions |
Pinout & Package
MC908QT4AMDWER is housed in a 16-pin SOIC-W (Wide) package with 1.27 mm pitch, JEDEC MS-013AC compliant, suitable for automated SMT assembly and thermal cycling reliability in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 2.7–5.5 V digital supply rail for core and I/O |
| VSS | Ground | Digital ground reference for all internal logic and I/O buffers |
| XTAL | Crystal input | Connects to external crystal or ceramic resonator for precise clock source |
| EXTAL | Crystal output | Completes crystal oscillator circuit; requires external load capacitors |
| PA0–PA3 | Port A I/O | 4-bit bidirectional port with keyboard interrupt capability and pull-up enable |
| AD0–AD3 | ADC input | Shared with PA0–PA3; selects analog channel for 10-bit conversion |
| IRQ | External interrupt | Edge-triggered interrupt input supporting wake-from-Stop mode |
| RESET | Active-low reset | Hardware reset input; also asserts on LVI trip and COP timeout |
Key Features
| Feature | Design Value |
|---|---|
| FLASH Security Byte Validation | Requires match of eight user-defined bytes at $FFF6–$FFFD to enter monitor mode; blocks entry if ≥5 are zero |
| Internal RC Oscillator Trim | Calibration register allows software adjustment of RCCLK frequency for ±2% accuracy over temperature |
| Auto Wakeup Module (AWU) | Generates periodic interrupts during Wait mode using RC oscillator; enables ultra-low-power polling |
| EEPROM Emulation | Uses dedicated FLASH pages to emulate EEPROM behavior with wear-leveling via firmware |
| Keyboard Interrupt (KBI) | Four-input KBI detects keypresses on PA0–PA3 with polarity-selectable edge detection and wake capability |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor with periodic wake-up and wireless transmission. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, AWU-driven sleep/wake cycles, and serial communication. Use Value: 192 B RAM and 4 KB FLASH accommodate sensor fusion algorithms and firmware updates; LVI ensures reliable reset during battery sag. |
Use Scenario: Microwave oven control panel with keypad interface and safety interlock monitoring. IC Role / Device Role / Timing Role: Dedicated UI controller handling KBI key scan, display driver timing, and door switch supervision. Use Value: Integrated KBI on PA0–PA3 eliminates external debounce logic; COP watchdog prevents lockup during cooking cycles. |
| Smart Meter Subsystem | Motorized Valve Actuator |
Use Scenario: Tamper-detection module in electricity meter with secure firmware update capability. IC Role / Device Role / Timing Role: Secure co-processor validating firmware signatures and enforcing flash write protection. Use Value: FLASH security byte check ($FFF6–$FFFD) prevents unauthorized monitor-mode access to protected code regions. |
Use Scenario: Low-power actuator controller for HVAC zone valves with position feedback and duty-cycle limiting. IC Role / Device Role / Timing Role: Real-time motor sequencer using TIM module outputs and ADC-based current sensing. Use Value: 10-bit ADC resolution enables precise current measurement for overcurrent shutdown; Stop mode reduces quiescent current to <1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908QT2AMDWER | 2 KB FLASH, 128 B RAM, identical pinout and peripheral set | Lower memory capacity limits firmware complexity and data logging depth | Select when application fits within 2 KB code space and requires cost optimization |
| S9KEAZ128AMLH | ARM Cortex-M0+ core, 128 KB FLASH, 16 KB RAM, enhanced ADC and DMA | Higher performance, modern toolchain, but requires PCB redesign and firmware porting | Choose for new designs needing scalability, USB, or CAN; not drop-in compatible |
Compared with MC908QT2AMDWER, the MC908QT4AMDWER offers double FLASH and 50% more RAM for larger control algorithms; versus S9KEAZ128AMLH, it retains legacy HC08 toolchain compatibility and lower BOM cost but lacks ARM ecosystem features.
Availability
MC908QT4AMDWER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, smart meter subsystems, and motorized valve actuators requiring stable component supply and long-term lifecycle support.
Supply support for MC908QT4AMDWER 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 delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications, with roots in Freescale's embedded MCU heritage.
The MC908QT4AMDWER belongs to the legacy HCS08 microcontroller family, designed for cost-sensitive, low-power 8-bit embedded control where deterministic real-time response and field-programmability are essential.
FAQ
What is the maximum operating frequency of the MC908QT4AMDWER?
The MC908QT4AMDWER supports a maximum bus clock frequency of 8 MHz, derived from its internal RC oscillator (trimmable to ±2%), external crystal (up to 8 MHz), or external clock source. This frequency defines instruction execution speed and peripheral timing constraints, including ADC conversion time and timer resolution.
Does the MC908QT4AMDWER support in-circuit debugging?
Yes, the MC908QT4AMDWER supports in-circuit debugging via its built-in monitor mode, accessible through the BKGD pin. Entry requires correct security byte validation at addresses $FFF6–$FFFD. Debugging capabilities include single-stepping, breakpoint setting, and memory/register inspection using standard HC08-compatible tools like P&E Multilink.
How does the FLASH security feature work on the MC908QT4AMDWER?
The MC908QT4AMDWER implements FLASH security by requiring eight user-defined bytes programmed at memory locations $FFF6–$FFFD. During monitor mode entry, the host must transmit matching bytes; if five or more are zero, access is denied. This prevents unauthorized firmware readout while allowing legitimate development access.
What low-power modes are available on the MC908QT4AMDWER?
The MC908QT4AMDWER supports Wait and Stop modes. Wait mode halts the CPU while peripherals remain active; Stop mode disables the oscillator and most clocks, reducing current to <1 µA. Wake sources include IRQ, KBI, AWU timeout, and RESET assertion - enabling flexible power management for battery-operated devices.
Can the MC908QT4AMDWER emulate EEPROM functionality?
Yes, the MC908QT4AMDWER supports EEPROM emulation using designated FLASH memory pages. Firmware implements wear-leveling and atomic write routines to emulate byte-write behavior over FLASH's block-erase architecture. This enables non-volatile parameter storage without external EEPROM, preserving board space and BOM simplicity.
MC908QT4AMDWER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908QT4AMDWER FAQ
1.How can I place an order for MC908QT4AMDWER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908QT4AMDWER 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 MC908QT4AMDWER reliable?
The price and inventory of MC908QT4AMDWER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908QT4AMDWER is usually 5 days.
3.What payment methods are accepted for MC908QT4AMDWER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908QT4AMDWER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908QT4AMDWER?
MC908QT4AMDWER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908QT4AMDWER 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 MC908QT4AMDWER?
For technical support, including MC908QT4AMDWER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908QT4AMDWER requirements.
6.How does Aetrix verify that MC908QT4AMDWER is sourced from the original manufacturer or authorized distributors?
All MC908QT4AMDWER 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 MC908QT4AMDWER meets industry standards.
7.What is the process for return or replacement of MC908QT4AMDWER?
All MC908QT4AMDWER units undergo pre-shipment inspection (PSI). If there is an issue with MC908QT4AMDWER, 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 MC908QT4AMDWER part is unused and in its original packaging.
Return procedure for MC908QT4AMDWER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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