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NXP Semiconductors MC68HC908QT1CPE
- Part No.:
- MC68HC908QT1CPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC68HC908QT1CPE.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,255
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Product details
Overview
MC68HC908QT1CPE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 1 KB FLASH, 64 bytes RAM, internal RC oscillator (4 MHz typical), 8-pin DIP package, and integrated ADC, COP watchdog, LVI, and keyboard interrupt module - used in low-cost appliance control and industrial sensor interfaces.
For engineers reviewing the MC68HC908QT1CPE datasheet, MC68HC908QT1CPE pinout, MC68HC908QT1CPE application, or MC68HC908QT1CPE equivalent, key selection criteria include its 8-pin DIP footprint, 4 MHz internal clock accuracy (±5% over temperature), 8-bit ADC with 4-channel input, COP timeout programmability, and support for STOP/WAIT low-power modes in embedded control systems.
Technical Context
The MC68HC908QT1CPE implements the M68HC08 CPU core with 16-bit address bus, Harvard architecture, and 32-instruction-cycle minimum interrupt latency. It integrates a 4-channel 8-bit successive-approximation ADC with software-selectable conversion clock source and optional auto-triggering via timer or external event.
Its oscillator subsystem supports internal RC (4 MHz ±5%), external crystal (up to 8 MHz), or external clock input, with configurable BUSCLKX2/BUSCLKX4 outputs. The SIM includes reset sources from power-on, COP timeout, LVI trip, and external IRQ, all mapped to a single vector with status flag prioritization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC08 8-bit CISC core with 32+ cycle interrupt latency and 16-bit addressing |
| FLASH Memory | 1 KB on-chip FLASH with page erase, mass erase, and block protection register |
| RAM Size | 64 bytes of on-chip RAM for data and stack storage |
| ADC Resolution | 8-bit successive-approximation ADC with 4 analog input channels (AN0–AN3) |
| Internal Oscillator | RC-based 4 MHz ±5% over –40°C to +85°C; trimmable via OSCTRIM register |
| Power Modes | Active, WAIT (CPU halted, peripherals active), and STOP (all clocks gated, 1 µA typical) |
| Package | 8-pin plastic DIP (Dual In-line Package), 0.3 inch width, through-hole mounting |
Pinout & Package
MC68HC908QT1CPE uses an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and 0.1-inch pin pitch, designed for through-hole PCB assembly and legacy prototyping environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage | Positive power rail (4.5–5.5 V); powers core, I/O, and ADC reference |
| VSS | Ground | Digital ground reference for all internal logic and analog circuitry |
| OSC1 | Crystal input | Input to internal crystal amplifier; accepts external crystal or clock source |
| OSC2/PTA4/BUSCLKX4 | Crystal output / Port A bit 4 / Clock output | Crystal amplifier output; also serves as general-purpose I/O or 4× bus clock output |
| PTA0/IRQ | Port A bit 0 / External interrupt | Shared I/O pin; functions as digital input/output or edge-triggered IRQ source |
| PTA1/AN0 | Port A bit 1 / ADC channel 0 | Configurable digital I/O or analog input for 8-bit ADC conversion |
| PTA2/AN1 | Port A bit 2 / ADC channel 1 | Configurable digital I/O or analog input for 8-bit ADC conversion |
| PTA3/AN2/AN3 | Port A bit 3 / ADC channels 2 & 3 | Configurable digital I/O or analog input for dual-channel ADC sampling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated COP watchdog | Configurable timeout (0.5 ms to 1.0 s) with independent clock source prevents runaway code |
| Low-voltage inhibit (LVI) | Programmable trip point (4.25 V or 3.7 V) forces reset before supply collapse corrupts FLASH |
| Auto-wakeup module (AWU) | Generates periodic interrupts from STOP mode using internal RC oscillator (no external components) |
| Keyboard interrupt (KBI) | Scans up to 8-key matrix via PTA0–PTA3 with hardware debouncing and interrupt-on-change |
| FLASH block protection | FLBPR register enables write/erase lock for bootloader or calibration data sections |
Applications
| Appliance Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Standalone control of washing machine motor sequencing, water valve timing, and LED display. IC Role / Device Role / Timing Role: Primary MCU executing state-machine logic, driving discrete outputs, and reading front-panel buttons. Use Value: Integrated KBI eliminates external debounce circuitry; 1 KB FLASH accommodates full control firmware in compact DIP form factor. | Use Scenario: Battery-powered temperature/humidity node transmitting data via UART to gateway. IC Role / Device Role / Timing Role: Sensor acquisition controller with ADC sampling, LVI monitoring, and STOP-mode power management. Use Value: 1 µA STOP current extends battery life; internal 4 MHz RC oscillator avoids crystal BOM cost and layout area. |
| Legacy Equipment Retrofit | Small-Motor Drive Supervision |
Use Scenario: Replacing obsolete discrete logic or EPROM-based controllers in HVAC fan speed modules. IC Role / Device Role / Timing Role: Drop-in replacement MCU handling PWM generation, fault detection, and serial diagnostics. Use Value: 8-pin DIP footprint matches legacy socket; BUSCLKX4 output drives external logic at 16 MHz equivalent timing. | Use Scenario: Monitoring overcurrent, thermal shutdown, and supply brownout in 24 V DC brush motor driver. IC Role / Device Role / Timing Role: Safety supervisor interfacing with gate drivers and reporting faults via PTA pins. Use Value: LVI reset ensures safe shutdown before undervoltage causes erratic gate drive; COP prevents latch-up during EMI events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QT2CPE | 2 KB FLASH, same 8-pin DIP package, identical peripheral set and pinout | Supports larger firmware images and bootloader partitioning without layout change | Select when firmware exceeds 1 KB or requires field-upgradable code |
| MC68HC908QY1CP | 8-pin SOIC package (surface-mount), 1 KB FLASH, same core/peripherals but different pin mapping | Requires PCB redesign; suited for automated SMT production instead of through-hole | Select for volume manufacturing where board space and assembly automation are priorities |
Compared with MC68HC908QT2CPE and MC68HC908QY1CP, the MC68HC908QT1CPE offers minimal footprint and lowest BOM cost for fixed-function control, while sacrificing upgrade headroom and surface-mount compatibility - ideal for cost-sensitive, low-volume, or legacy-repair use cases.
Availability
MC68HC908QT1CPE is available at Aetrix Electronics and suitable for appliance control, industrial sensor interface, and legacy equipment retrofit requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC908QT1CPE 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, specializing in secure connectivity, automotive, industrial, and IoT solutions.
The MC68HC908QT1CPE belongs to the HCS08 family - designed for cost-sensitive, low-pin-count embedded control applications where integration, power efficiency, and ease of programming outweigh raw performance needs.
FAQ
What is the maximum operating frequency of the MC68HC908QT1CPE?
The MC68HC908QT1CPE supports a maximum bus clock frequency of 8 MHz. When using the internal RC oscillator, it operates at 4 MHz nominal (±5% over temperature). External crystal or clock sources can drive the system up to 8 MHz, with BUSCLKX2 and BUSCLKX4 outputs providing derived clock signals for peripheral synchronization. The MC68HC908QT1CPE's instruction execution rate scales directly with bus clock speed, delivering up to 2 million instructions per second at 8 MHz.
Does the MC68HC908QT1CPE support in-circuit programming?
Yes, the MC68HC908QT1CPE supports in-circuit programming via the MON (Monitor) module using a standard RS-232 interface and dedicated monitor mode entry sequence (RESET + specific pin states). No external programmer hardware is required beyond a UART-level signal translator. The MC68HC908QT1CPE's on-chip FLASH allows full firmware updates in the target system, enabling field upgrades and factory programming without removing the device from the PCB.
What ADC input channels are available on the MC68HC908QT1CPE?
The MC68HC908QT1CPE provides four ADC input channels: AN0 (PTA1), AN1 (PTA2), and AN2/AN3 multiplexed on PTA3. All channels share the same 8-bit successive-approximation converter with software-selectable clock prescaling and conversion trigger sources (software, timer overflow, or external event). The MC68HC908QT1CPE does not support differential inputs or internal temperature sensor - inputs are single-ended relative to VSS.
Can the MC68HC908QT1CPE operate from a 3.3 V supply?
No, the MC68HC908QT1CPE is specified only for 4.5 V to 5.5 V operation per its electrical characteristics table. Its internal oscillator, FLASH programming voltage, and I/O thresholds are optimized for 5 V TTL-compatible signaling. Operating below 4.5 V risks unreliable FLASH writes, COP timeout instability, and undefined reset behavior. For 3.3 V systems, consider NXP's later S08DZ or S08PT families - the MC68HC908QT1CPE requires strict 5 V supply regulation.
What debug and development tools are compatible with the MC68HC908QT1CPE?
The MC68HC908QT1CPE is supported by Freescale's (now NXP's) P&E Micro USB-ML-ICP programmer/debugger and the CodeWarrior Development Studio for HC08 v6.x. These tools enable full-cycle development including assembly/C compilation, FLASH programming, real-time register inspection, and breakpoint debugging via the MON module. The MC68HC908QT1CPE does not support JTAG or SWD; debug access relies exclusively on the asynchronous serial monitor interface using PTA0/PTA1 pins.
MC68HC908QT1CPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- HC08
- Packaging:
- Tube
- 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:
- 1.5KB (1.5K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC68HC908QT1CPE FAQ
1.How can I place an order for MC68HC908QT1CPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QT1CPE 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 MC68HC908QT1CPE reliable?
The price and inventory of MC68HC908QT1CPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QT1CPE is usually 5 days.
3.What payment methods are accepted for MC68HC908QT1CPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QT1CPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908QT1CPE?
MC68HC908QT1CPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QT1CPE 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 MC68HC908QT1CPE?
For technical support, including MC68HC908QT1CPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QT1CPE requirements.
6.How does Aetrix verify that MC68HC908QT1CPE is sourced from the original manufacturer or authorized distributors?
All MC68HC908QT1CPE 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 MC68HC908QT1CPE meets industry standards.
7.What is the process for return or replacement of MC68HC908QT1CPE?
All MC68HC908QT1CPE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QT1CPE, 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 MC68HC908QT1CPE part is unused and in its original packaging.
Return procedure for MC68HC908QT1CPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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