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NXP Semiconductors MC908QC8CDXE
- Part No.:
- MC908QC8CDXE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC908QC8CDXE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,138
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Product details
Overview
MC908QC8CDXE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 8 KB on-chip FLASH, 512 B RAM, and integrated peripherals including ADC10, ESCI, SPI, TIM1/TIM2, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets low-cost embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MC908QC8CDXE datasheet, MC908QC8CDXE pinout, MC908QC8CDXE application, or MC908QC8CDXE equivalent, key selection considerations include its 28-pin SOIC package, FLASH security byte validation ($FFF6–$FFFD), 10-bit ADC with 8-channel input, ESCI asynchronous serial interface, and support for wait/stop low-power modes with LVI reset protection.
Technical Context
The MC908QC8CDXE implements the HCS08 CPU core with 16-bit address space, 8-level hardware stack, and instruction set compatible with HC08 derivatives. Its memory map includes 8 KB FLASH (with block protection and EEPROM emulation), 512 B RAM, and 64 B of register space mapped to direct page addresses.
Peripherals are managed via the System Integration Module (SIM), which handles clock distribution (BUSCLKX2/BUSCLKX4), reset control, interrupt vectoring, and mode configuration. The enhanced serial communications interface (ESCI) supports full-duplex asynchronous operation with programmable baud rate, while the ADC10 module provides 10-bit resolution with software- or timer-triggered conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit addressing and 8-level hardware stack |
| FLASH Memory | 8 KB on-chip FLASH with mass/page erase, block protection, and EEPROM emulation capability |
| RAM Size | 512 bytes of on-chip RAM for data storage and stack operations |
| ADC Resolution | 10-bit successive-approximation ADC with 8 analog input channels and configurable sample time |
| Max Bus Frequency | 8 MHz - determines instruction execution speed and peripheral timing margins |
| Supply Voltage Range | 2.7 V to 5.5 V - enables direct interface with 3.3 V and 5 V logic systems without level translation |
| Security Mechanism | Monitor-mode entry requires matching eight user-defined security bytes at $FFF6–$FFFD; denies access if ≥5 are zero |
Pinout & Package
MC908QC8CDXE is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 0.3-inch body width and standard 1.27 mm pitch. Pin assignments follow the MC68HC908QC family layout, with dedicated ports, oscillator inputs, reset, and power pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main digital supply input (2.7–5.5 V); must be decoupled near pin |
| VSS | Ground | Digital ground reference; separate analog ground (VSSA) required for ADC accuracy |
| OSC1 / OSC2 | Crystal Oscillator Interface | Connects to external crystal or ceramic resonator; internal RC oscillator available as fallback |
| RESET | Active-Low Reset Input | Asynchronous reset assertion; internally pulled up; accepts external pushbutton or supervisor signal |
| PTA0–PTA7 | Port A I/O Pins | 8-bit general-purpose bidirectional port with individual direction control and pull-up enable |
| PTB0–PTB3 | Port B I/O Pins | 4-bit port supporting KBI interrupt inputs and ESCI/SPI alternate functions |
| PTC0–PTC3 | Port C I/O Pins | 4-bit port with ADC channel inputs (AD0–AD3) and TIM1/TIM2 capture/compare functionality |
| AD4–AD7 | ADC Analog Inputs | Additional 4-channel analog inputs multiplexed onto Port B pins PTB0–PTB3 when configured for ADC use |
Key Features
| Feature | Design Value |
|---|---|
| FLASH Security Bytes | User-programmable 8-byte pattern at $FFF6–$FFFD enforces monitor-mode access control; prevents unauthorized firmware readout |
| ADC10 Module | 10-bit resolution with 8 selectable input channels, software/timer trigger, and conversion complete interrupt |
| ESCI Serial Interface | Full-duplex UART supporting asynchronous communication with programmable baud rate and framing options |
| COP Watchdog | Configurable timeout (0.5 ms to 1.6 s) with disable option; resets MCU on timeout or illegal COPCTL write |
| Low-Voltage Inhibit (LVI) | Programmable trip point (2.5 V or 3.8 V) with hysteresis prevents erratic operation during brown-out conditions |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
|
Use Scenario: Standalone temperature/humidity sensor with local display and RS-232 output. IC Role / Device Role / Timing Role: Main system controller executing sensor polling, linearization, and serial protocol handling. Use Value: On-chip ADC10 eliminates external converter; ESCI enables direct UART-to-RS232 interface; 8 KB FLASH accommodates calibration tables and firmware updates. |
Use Scenario: Microwave oven main control board managing keypad, display, magnetron, and safety interlocks. IC Role / Device Role / Timing Role: Central real-time controller coordinating user input (KBI), cooking timers (TIM1/TIM2), and fault monitoring (COP/LVI). Use Value: KBI supports matrix keypad scanning; COP ensures safe shutdown on software hang; LVI prevents erratic behavior during line dips. |
| Smart Power Outlet | Motorized Valve Controller |
|
Use Scenario: Wi-Fi-enabled outlet with current sensing, relay control, and energy logging. IC Role / Device Role / Timing Role: Local intelligence unit handling AC zero-cross detection, relay timing, and analog current measurement. Use Value: TIM1 captures zero-cross events; ADC10 measures shunt voltage; 512 B RAM stores rolling energy counters between cloud syncs. |
Use Scenario: HVAC actuator controlling damper position via stepper motor with feedback potentiometer. IC Role / Device Role / Timing Role: Closed-loop position controller using ADC for pot reading and TIM2 for step pulse generation. Use Value: ADC10 provides 10-bit position resolution; TIM2 outputs precise step pulses; FLASH stores calibration offsets per unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908QC16CDXE | 16 KB FLASH, same pinout and peripheral set; higher code capacity for complex control algorithms | Preferred where firmware size exceeds 8 KB or future feature expansion is anticipated | Select when additional FLASH headroom is needed without changing PCB layout |
| MC908QY4CDTE | 4 KB FLASH, 20-pin TSSOP; reduced I/O count and no ESCI module; lower cost and smaller footprint | Suitable for ultra-simple controls like LED drivers or basic timers where serial comms are unnecessary | Choose for cost-sensitive, space-constrained designs with minimal peripheral requirements |
Compared with MC908QC8CDXE, the MC908QC16CDXE offers double FLASH for larger firmware while maintaining identical peripherals and pin compatibility, whereas the MC908QY4CDTE trades FLASH, I/O, and ESCI for lower cost and size-making it suitable only for stripped-down implementations.
Availability
MC908QC8CDXE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and smart power outlets requiring stable component supply and long-term manufacturing continuity.
Supply support for MC908QC8CDXE 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 pioneer in 8-bit and 32-bit microcontrollers, known for robust automotive and industrial-grade silicon.
The MC68HC908QC family was designed for cost-sensitive, low-power embedded control applications requiring integrated analog interfaces, serial communication, and reliable reset/watchdog functionality.
FAQ
What is the maximum bus frequency supported by the MC908QC8CDXE?
The MC908QC8CDXE supports a maximum bus frequency of 8 MHz. This timing governs instruction execution speed, peripheral clocking, and ADC conversion rates. Operation at this frequency requires stable 2.7–5.5 V supply and proper oscillator configuration - typically using an external crystal on OSC1/OSC2 or trimmed internal RC source. The MC908QC8CDXE datasheet specifies timing parameters under both 3.3 V and 5 V conditions.
Does the MC908QC8CDXE include hardware debug support?
The MC908QC8CDXE supports background debug mode (BDM) via a single-wire interface, enabling non-intrusive program download, breakpoint setting, and register inspection. Debug entry requires correct security byte matching at $FFF6–$FFFD. Unlike newer HCS12 devices, it lacks JTAG; BDM is the sole standardized debug path defined in the MC68HC908QC16/8/4 datasheet Rev. 5.
How does the FLASH security feature work on the MC908QC8CDXE?
The MC908QC8CDXE implements FLASH security by requiring eight user-defined bytes stored at memory locations $FFF6–$FFFD to match host-supplied values during monitor mode entry. If five or more of those bytes are zero, monitor access is denied. This prevents unauthorized firmware extraction while allowing legitimate development tools to bypass protection when valid keys are provided.
Can the MC908QC8CDXE operate from a 3.3 V supply?
Yes, the MC908QC8CDXE is fully specified for 3.3 V operation across its entire temperature range (–40°C to +85°C). Electrical characteristics including I/O voltage levels, ADC reference behavior, and ESCI timing are validated at 3.3 V. The device maintains full functionality - including FLASH programming and COP operation - without requiring level shifters or external regulators beyond standard decoupling.
What peripheral modules are integrated into the MC908QC8CDXE?
The MC908QC8CDXE integrates the ADC10 (10-bit, 8-channel), ESCI (asynchronous serial), SPI (synchronous serial), two 16-bit timer modules (TIM1 and TIM2), keyboard interrupt (KBI), computer operating properly (COP) watchdog, low-voltage inhibit (LVI), and periodic wakeup (PWU). All are accessible via the System Integration Module (SIM) and share the HCS08's unified memory-mapped register architecture.
MC908QC8CDXE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 12
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 384 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 10x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908QC8CDXE FAQ
1.How can I place an order for MC908QC8CDXE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908QC8CDXE 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 MC908QC8CDXE reliable?
The price and inventory of MC908QC8CDXE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908QC8CDXE is usually 5 days.
3.What payment methods are accepted for MC908QC8CDXE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908QC8CDXE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908QC8CDXE?
MC908QC8CDXE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908QC8CDXE 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 MC908QC8CDXE?
For technical support, including MC908QC8CDXE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908QC8CDXE requirements.
6.How does Aetrix verify that MC908QC8CDXE is sourced from the original manufacturer or authorized distributors?
All MC908QC8CDXE 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 MC908QC8CDXE meets industry standards.
7.What is the process for return or replacement of MC908QC8CDXE?
All MC908QC8CDXE units undergo pre-shipment inspection (PSI). If there is an issue with MC908QC8CDXE, 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 MC908QC8CDXE part is unused and in its original packaging.
Return procedure for MC908QC8CDXE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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