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NXP Semiconductors MC68HC11K1CFNE4
- Part No.:
- MC68HC11K1CFNE4
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
MC68HC11K1CFNE4.pdf
- Description:
- IC MCU 8BIT ROMLESS 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
MC68HC11K1CFNE4 from Freescale Semiconductor is an 8-bit HCMOS microcontroller unit (MCU) featuring 512 bytes of on-chip EEPROM, 512 bytes of RAM, and 24 KB of ROM. It integrates a 16-bit timer subsystem with input capture, output compare, pulse accumulator, and real-time interrupt capabilities, plus an 8-channel 8-bit analog-to-digital converter. It is used in industrial motor control systems requiring deterministic timing and embedded sensor interfacing.
For engineers reviewing the MC68HC11K1CFNE4 datasheet, MC68HC11K1CFNE4 pinout, MC68HC11K1CFNE4 application, or MC68HC11K1CFNE4 equivalent, key selection criteria include its single-chip mode operation, on-chip COP watchdog, E-clock timing architecture, and compatibility with legacy M68HC11 development tools and assembly toolchains.
Technical Context
The MC68HC11K1CFNE4 implements the classic M68HC11 CPU core with 16-bit address bus and 8-bit data bus, executing instructions at up to 2 MHz internal bus speed using a two-phase E-clock derived from external crystal or oscillator. Its memory map includes dedicated register space, RAM, EEPROM, and ROM regions mapped across fixed addresses, supporting both single-chip and expanded modes via chip select logic.
It features dual serial interfaces - an asynchronous SCI for host communication and a synchronous SPI for peripheral expansion - alongside parallel I/O ports A–H with configurable direction and internal pullups. The integrated A/D converter supports software- or timer-triggered conversions with selectable reference voltage sources (VRH/VRL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC11 8-bit CISC core with 16-bit index registers and condition code register |
| Max Bus Frequency | 2 MHz - determines instruction throughput and peripheral timing margins |
| On-Chip Memory | 24 KB ROM + 512 B EEPROM + 512 B RAM - enables standalone firmware execution without external memory |
| A/D Converter | 8-channel, 8-bit successive approximation ADC with programmable conversion trigger and VRH/VRL reference inputs |
| Timer System | 16-bit timer with 4 input capture, 5 output compare channels, pulse accumulator, and real-time interrupt |
| Serial Interfaces | SCI (asynchronous UART) and SPI (synchronous master/slave) - support sensor telemetry and peripheral daisy-chaining |
| Operating Voltage | 5.0 V ±10% - compatible with standard TTL/CMOS logic levels and industrial power rails |
| Package | 84-pin PLCC (Case 780) - surface-mountable with thermal and mechanical reliability for industrial PCBs |
Pinout & Package
MC68HC11K1CFNE4 is housed in an 84-pin Plastic-Leaded Chip Carrier (PLCC), Case 780, with gull-wing leads and JEDEC-standard footprint. The package supports reflow soldering and provides robust thermal dissipation for continuous operation in ambient temperatures up to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Primary digital power domain; decoupling required within 1 cm of pins for noise immunity |
| AVDD, AVSS | Analog power and ground | Isolated analog supply pins for A/D converter; must be filtered separately from digital VDD |
| XTAL / EXTAL | Clock input pair | Drives on-chip crystal oscillator; supports 1–4 MHz crystals or external clock source at EXTAL |
| E | External clock output | Provides synchronized E-clock (½ oscillator frequency) for peripheral timing coordination |
| RESET | Active-low reset input | Asynchronous hardware reset; requires external RC circuit per Figure 2-5 in datasheet |
| IRQ / XIRQ | Maskable and non-maskable interrupt inputs | Supports priority-based event handling; XIRQ cannot be disabled by software |
| PORTA–PORTH | Bi-directional I/O ports | Configurable as general-purpose I/O or dedicated peripheral signals (e.g., SCI TX/RX, SPI MOSI/MISO) |
| VRH / VRL | Analog reference high/low | Set A/D full-scale range; VRH = VDD and VRL = VSS by default, but externally adjustable |
Key Features
| Feature | Design Value |
|---|---|
| On-chip EEPROM | 512 bytes with byte-erase, row-erase, and bulk-erase capability - enables field firmware updates and parameter storage without external memory |
| COP Watchdog | Computer Operating Properly system with programmable timeout - prevents runaway code in safety-critical motor control loops |
| Single-Chip Mode | Full functionality with no external memory required - reduces BOM count and PCB area in cost-sensitive applications |
| Bootstrap ROM | On-chip 512-byte bootloader supporting in-system programming via SCI - eliminates need for external EPROM programmer |
| Low-Power Modes | Wait, Stop, and Slow modes with wake-on-interrupt - extends battery life in portable instrumentation |
| Hardware Timer Flexibility | Input capture for RPM measurement, output compare for PWM generation, and pulse accumulation for flow meter counting - all in one unified 16-bit timer module |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using tachometer feedback and PWM drive signal. IC Role / Device Role / Timing Role: MCU executes PID algorithm, reads A/D tachometer voltage, generates precise PWM duty cycle via output compare, and logs fault events to EEPROM. Use Value: Deterministic 2 MHz bus timing ensures sub-millisecond control loop execution; on-chip EEPROM retains calibration data across power cycles. | Use Scenario: Window lift controller with anti-pinch detection using current sensing and position tracking. IC Role / Device Role / Timing Role: Reads analog current sense and potentiometer signals, detects stall conditions via pulse accumulator edge counting, and drives H-bridge via PORTB outputs. Use Value: Integrated 8-channel A/D and pulse accumulator eliminate external signal conditioning ICs; COP watchdog meets automotive functional safety requirements. |
| Portable Data Logger | Legacy Industrial PLC I/O Module |
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and light intensity at 10-second intervals. IC Role / Device Role / Timing Role: Wakes from Stop mode on RTI interrupt, samples sensors via A/D, stores results in EEPROM, then returns to low-power state. Use Value: Ultra-low standby current (<10 µA) and on-chip EEPROM enable multi-year operation on coin-cell battery without external storage. | Use Scenario: Retrofit I/O expansion for aging PLC systems requiring discrete input monitoring and relay control. IC Role / Device Role / Timing Role: Interfaces with 24 VDC industrial sensors via opto-isolated inputs on PORTC, drives 12 V relays via PORTD high-side drivers, and communicates status via SCI to main PLC CPU. Use Value: Single-chip mode and configurable I/O direction simplify interface design; E-clock synchronization ensures deterministic scan-cycle timing with host controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC11E9CP | Same CPU core but 512 B RAM, 256 B EEPROM, 12 KB ROM; 80-pin QFP package | Lacks pulse accumulator and has reduced timer channel count; lower memory density | Select when board space constraints favor QFP and application does not require pulse accumulation or full 24 KB ROM |
| MC912B32CPVE | Enhanced 68HC12 core with 32 KB FLASH, 2 KB RAM, 10-bit A/D, and CAN 2.0B interface | Higher performance, flash-based reprogrammability, and CAN bus support - not pin-compatible | Select for new designs requiring field-upgradable firmware and vehicle network integration; requires PCB redesign |
Compared with MC68HC11E9CP, the MC68HC11K1CFNE4 offers greater on-chip memory and pulse accumulation for sensor counting; compared with MC912B32CPVE, it provides proven reliability in legacy systems but lacks flash and CAN - making it optimal for cost-sensitive, non-networked industrial upgrades.
Availability
MC68HC11K1CFNE4 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, portable data loggers, and legacy PLC I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC11K1CFNE4 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) was a leading designer of embedded processors and analog/mixed-signal ICs, founded in 2004 as a spin-off from Motorola's semiconductor division.
The MC68HC11K family was designed for deterministic real-time control in resource-constrained industrial and automotive environments, emphasizing on-chip integration, low-power operation, and toolchain continuity with the broader 68HC11 ecosystem.
FAQ
What is the maximum operating frequency of the MC68HC11K1CFNE4?
The MC68HC11K1CFNE4 operates with a maximum internal bus frequency of 2 MHz, derived from an external crystal or oscillator connected to XTAL/EXTAL pins. This corresponds to a maximum 4 MHz oscillator input, as the on-chip oscillator divides by two to generate the E-clock. Timing-critical peripherals like the A/D converter and timer subsystem are synchronized to this E-clock, and all electrical characteristics in Section 12 of the datasheet are validated at this speed.
Does the MC68HC11K1CFNE4 support in-system programming?
Yes, the MC68HC11K1CFNE4 supports in-system programming via its on-chip bootstrap ROM. Using the SCI interface and Freescale's bundled BUFFALO monitor firmware, users can download and program the 512-byte EEPROM over a serial link without removing the device from the target board. This capability is documented in Section 4.6.4 and Section 4.8.2 of the M68HC11K Family Technical Data manual.
What are the key differences between MC68HC11K1CFNE4 and MC68HC11A8?
The MC68HC11K1CFNE4 features 24 KB of ROM, 512 B EEPROM, and 512 B RAM in an 84-pin PLCC package, while the MC68HC11A8 contains 8 KB of ROM, 512 B RAM, and no on-chip EEPROM - requiring external memory for non-volatile storage. The K1 variant also adds enhanced timer functionality including pulse accumulation and additional output compare channels, making it suitable for more complex real-time control tasks than the A8.
Can the MC68HC11K1CFNE4 operate in low-power modes?
Yes, the MC68HC11K1CFNE4 supports three low-power modes: Wait (CPU halted, peripherals active), Stop (all clocks stopped except RTC-related circuits), and Slow (reduced E-clock frequency). In Stop mode, typical current consumption is less than 10 µA at 5 V and 25°C, enabling battery-powered operation for extended periods. Wakeup is supported via IRQ, XIRQ, RTI, or SCI receive events, as detailed in Section 5.8 of the technical data.
Is the MC68HC11K1CFNE4 pin-compatible with other M68HC11 variants?
No, the MC68HC11K1CFNE4 is not universally pin-compatible across the M68HC11 family. It uses an 84-pin PLCC package (Case 780), whereas variants like the MC68HC11E9CP use 80-pin QFP and the MC68HC11KS2 uses 68-pin PLCC. Pin assignments differ significantly between packages, and even functionally identical signals may occupy different physical locations - requiring PCB layout changes for substitution.
MC68HC11K1CFNE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 84-LCC (J-Lead)
- Series:
- HC11
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC11
- Core Size:
- 8-Bit
- Speed:
- 4MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 37
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- 640 x 8
- RAM Size:
- 768 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC11K1CFNE4 FAQ
1.How can I place an order for MC68HC11K1CFNE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC11K1CFNE4 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 MC68HC11K1CFNE4 reliable?
The price and inventory of MC68HC11K1CFNE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC11K1CFNE4 is usually 5 days.
3.What payment methods are accepted for MC68HC11K1CFNE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC11K1CFNE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC11K1CFNE4?
MC68HC11K1CFNE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC11K1CFNE4 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 MC68HC11K1CFNE4?
For technical support, including MC68HC11K1CFNE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC11K1CFNE4 requirements.
6.How does Aetrix verify that MC68HC11K1CFNE4 is sourced from the original manufacturer or authorized distributors?
All MC68HC11K1CFNE4 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 MC68HC11K1CFNE4 meets industry standards.
7.What is the process for return or replacement of MC68HC11K1CFNE4?
All MC68HC11K1CFNE4 units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC11K1CFNE4, 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 MC68HC11K1CFNE4 part is unused and in its original packaging.
Return procedure for MC68HC11K1CFNE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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