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NXP Semiconductors MC68HC908QT1CP
- Part No.:
- MC68HC908QT1CP
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC68HC908QT1CP.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,635
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Product details
Overview
MC68HC908QT1CP from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 1 KB FLASH, 64 bytes RAM, internal RC oscillator (4 MHz nominal), 8-pin SOIC package, and integrated ADC, KBI, COP watchdog, and LVI voltage monitor - designed for cost-sensitive embedded control in appliance timers, motor starters, and sensor interface modules.
For engineers reviewing the MC68HC908QT1CP datasheet, MC68HC908QT1CP pinout, MC68HC908QT1CP application, or MC68HC908QT1CP equivalent, key selection considerations include its 8-pin SOIC footprint, 4 MHz internal clock accuracy (±15% over temperature), 8-bit ADC with 4-channel input, keyboard interrupt capability on Port A pins, and support for WAIT/STOP low-power modes in battery-constrained systems.
Technical Context
The MC68HC908QT1CP implements the M68HC08 CPU core with 16-bit address space, Harvard architecture memory map, and on-chip FLASH programmable in-system via single-VDD supply. Its oscillator module supports internal RC, external crystal, or external clock sources with automatic failover and trimming via OSCTRIM register at $FFC0.
Peripheral integration includes a 4-channel 8-bit ADC with software-triggered conversion, keyboard interrupt module (KBI) with configurable edge detection on PA0–PA3, and system-level features such as computer operating properly (COP) watchdog with selectable timeout (1.1–17.7 ms), low-voltage inhibit (LVI) reset at 3.0 V ±0.1 V, and dual low-power modes (WAIT/STOP) with wake-up from IRQ, KBI, or AWU events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M68HC08 8-bit CPU with 16-bit addressing and 32-instruction set - enables deterministic real-time control with minimal code footprint. |
| FLASH Memory | 1 KB on-chip FLASH with block protection - supports in-system programming and firmware updates without external hardware. |
| RAM Size | 64 bytes of on-chip RAM - sufficient for stack, registers, and small variable sets in ultra-compact control applications. |
| ADC Resolution | 8-bit successive approximation ADC with 4 analog inputs - delivers 256-step quantization for basic sensor signal digitization. |
| Internal Oscillator | 4 MHz RC oscillator, ±15% accuracy over –40°C to +85°C - eliminates need for external crystal in non-timing-critical functions. |
| Supply Voltage | 2.7–5.5 V operation - compatible with single-cell Li-ion, 3.3 V logic, and legacy 5 V industrial rails. |
| Package | 8-pin SOIC (Small Outline Integrated Circuit), 150 mil width - standard surface-mount footprint for high-volume PCB assembly. |
Pinout & Package
MC68HC908QT1CP uses an 8-pin SOIC package (case 751B-03) with 1.27 mm pitch, 5.0 mm × 4.0 mm body, and standard JEDEC MS-012AC outline. Pin assignments are validated per Figure 1-2 and Table 1-2 of Rev. 6 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 2.7–5.5 V supply rail; decoupling capacitor required at pin for stable core and peripheral operation. |
| VSS | Ground | Digital ground reference; must be connected directly to PCB ground plane with low-inductance path. |
| OSC1 | Crystal amplifier input | Accepts external crystal (1–4 MHz) or CMOS clock source; unused when internal RC oscillator selected. |
| OSC2/PTA4/BUSCLKX4 | Crystal output / I/O / clock output | Drives crystal load; also serves as general-purpose I/O (PTA4) and outputs 4× bus clock for debug or timing sync. |
| PTA0–PTA3 | Keyboard interrupt inputs | Configurable as KBI wake-up pins with programmable edge sensitivity - used for keypad scanning or momentary switch detection. |
| IRQ | External interrupt request | Active-low asynchronous interrupt input; triggers vector at $FFFE–$FFFF and supports level- or edge-sensitive mode. |
| RESET | Active-low reset input | Hardware reset assertion overrides all internal states; internal pull-up ensures reliable startup without external resistor. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip FLASH with block protection | Enables field firmware updates and prevents accidental overwrite of critical bootloader or calibration data. |
| Integrated keyboard interrupt (KBI) | Reduces BOM count by eliminating external scan logic; supports up to 4-key matrix wake-up with debounce filtering. |
| Computer operating properly (COP) watchdog | Prevents runaway code execution with user-selectable timeout (1.1–17.7 ms); reset recovery time < 10 µs. |
| Low-voltage inhibit (LVI) | Guarantees safe reset before supply collapse - activates at 3.0 V ±0.1 V with hysteresis to prevent chatter near threshold. |
| Auto wakeup module (AWU) | Generates periodic interrupts from STOP mode using internal RC clock - extends battery life in intermittent-sensing applications. |
Applications
| Appliance Timer Control | Motor Starter Interface |
|---|---|
|
Use Scenario: Digital timer in microwave oven or washing machine control panel. IC Role / Device Role / Timing Role: Main controller executing state-machine logic, driving LED display segments, and managing user input via PTA0–PTA3 KBI lines. Use Value: 1 KB FLASH stores full UI logic and timing sequences; internal 4 MHz RC oscillator eliminates crystal BOM cost while meeting ±15% timing tolerance for non-critical delays. |
Use Scenario: Soft-start sequencer for single-phase AC induction motors in HVAC blowers. IC Role / Device Role / Timing Role: Supervisory MCU monitoring line voltage via ADC channel, triggering TRIAC gate drive after ramp delay. Use Value: LVI reset ensures safe shutdown during brownout; COP watchdog prevents latch-up during EMI transients on motor power lines. |
| Sensor Signal Conditioning | Industrial Keypad Interface |
|
Use Scenario: Analog front-end for thermistor-based temperature monitoring in thermostats. IC Role / Device Role / Timing Role: ADC digitizes conditioned sensor voltage; result processed and transmitted via simple UART bit-banging on PTA4. Use Value: 8-bit ADC resolution provides adequate 1°C granularity over 0–100°C range; 64-byte RAM holds calibration coefficients and filter buffers. |
Use Scenario: Dedicated keypad scanner in security panel or access control terminal. IC Role / Device Role / Timing Role: Dedicated KBI processor scanning 4-button matrix and debouncing inputs before forwarding key codes to host MCU. Use Value: Hardware KBI offloads host processor; PTA0–PTA3 support both rising/falling edge detection for momentary or latching switch types. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QT2CP | 2 KB FLASH, same 8-pin SOIC package and peripheral set - adds 1 KB program storage capacity. | Required where firmware exceeds 1 KB, e.g., multi-language UI or extended self-test routines. | Select MC68HC908QT2CP if future firmware growth or feature expansion is anticipated; pinout and code compatibility are maintained. |
| MC9RS08KA2CP | Renesas RS08 core, 2 KB FLASH, 128 bytes RAM, 10-bit ADC, and enhanced debug interface - newer architecture with higher code density. | Better suited for designs requiring longer-term roadmap support or higher ADC resolution for precision sensing. | Choose MC9RS08KA2CP for new designs needing extended lifecycle availability or improved analog performance; not pin-compatible. |
Compared with MC68HC908QT1CP, the QT2CP offers direct upgrade path with identical footprint and peripherals but double FLASH, while the RS08KA2CP provides architectural modernization and higher-resolution ADC at the cost of software migration and layout change.
Availability
MC68HC908QT1CP is available at Aetrix Electronics and suitable for appliance timer control, motor starter interface, and sensor signal conditioning applications requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.
Supply support for MC68HC908QT1CP 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 communication infrastructure markets.
The MC68HC908QT1CP belongs to the legacy HCS08 microcontroller family, engineered for ultra-low-cost, low-pin-count embedded control in resource-constrained environments where reliability and long-term supply stability are critical.
FAQ
What is the maximum operating frequency of the MC68HC908QT1CP?
The MC68HC908QT1CP operates with a maximum bus clock frequency of 4 MHz derived from its internal RC oscillator. This frequency is factory-trimmed and specified to maintain ±15% accuracy across the full industrial temperature range (–40°C to +85°C). External crystal or clock sources can be used to achieve higher precision, but the internal oscillator remains the default and most commonly deployed option for cost-sensitive applications.
Does the MC68HC908QT1CP support in-system programming (ISP)?
Yes, the MC68HC908QT1CP supports in-system programming via its single-wire background debug interface (BDM). FLASH memory can be reprogrammed using only the VDD, VSS, and BKGD pins - no external high-voltage programmer is required. This capability enables field firmware updates and simplifies manufacturing test and calibration workflows without removing the device from the PCB.
How many analog input channels does the ADC in the MC68HC908QT1CP support?
The MC68HC908QT1CP integrates an 8-bit successive approximation ADC with four dedicated analog input channels mapped to Port A pins PTA0–PTA3. These inputs share the same KBI-capable pins, allowing flexible allocation between keypad scanning and analog sensing - though simultaneous use requires careful timing coordination due to shared pin resources.
What low-power modes are available on the MC68HC908QT1CP?
The MC68HC908QT1CP supports two hardware low-power modes: WAIT mode (CPU halted, peripherals active) and STOP mode (all clocks stopped except AWU oscillator). In STOP mode, current consumption drops to less than 1 µA typical, and wake-up is supported via IRQ, KBI, or AWU timeout - making it suitable for battery-powered devices requiring extended standby duration.
Is the MC68HC908QT1CP pin-compatible with other members of the QY/QT family?
Yes, the MC68HC908QT1CP shares identical 8-pin SOIC pinout and electrical characteristics with MC68HC908QT2CP and MC68HC908QT4CP. This allows direct substitution within the same package variant for design scalability - for example, upgrading from 1 KB to 2 KB or 4 KB FLASH without PCB revision, provided firmware and peripheral configuration remain compatible.
MC68HC908QT1CP 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:
MC68HC908QT1CP FAQ
1.How can I place an order for MC68HC908QT1CP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QT1CP 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 MC68HC908QT1CP reliable?
The price and inventory of MC68HC908QT1CP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QT1CP is usually 5 days.
3.What payment methods are accepted for MC68HC908QT1CP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QT1CP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908QT1CP?
MC68HC908QT1CP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QT1CP 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 MC68HC908QT1CP?
For technical support, including MC68HC908QT1CP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QT1CP requirements.
6.How does Aetrix verify that MC68HC908QT1CP is sourced from the original manufacturer or authorized distributors?
All MC68HC908QT1CP 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 MC68HC908QT1CP meets industry standards.
7.What is the process for return or replacement of MC68HC908QT1CP?
All MC68HC908QT1CP units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QT1CP, 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 MC68HC908QT1CP part is unused and in its original packaging.
Return procedure for MC68HC908QT1CP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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