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NXP Semiconductors MC68HC11A1CFNE3
- Part No.:
- MC68HC11A1CFNE3
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
MC68HC11A1CFNE3.pdf
- Description:
- IC MCU 8BIT ROMLESS 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,420
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Product details
Overview
MC68HC11A1CFNE3 from Freescale Semiconductor is an HCMOS 8-bit single-chip microcontroller featuring 512 bytes of on-chip EEPROM, 512 bytes of RAM, and 12 KB of ROM. It integrates a 16-bit programmable timer, 8-channel 8-bit analog-to-digital converter, dual serial interfaces (SCI and SPI), and five parallel I/O ports (A–E) for embedded control in industrial automation and automotive subsystems.
For engineers reviewing the MC68HC11A1CFNE3 datasheet, MC68HC11A1CFNE3 pinout, MC68HC11A1CFNE3 application, or MC68HC11A1CFNE3 equivalent, this page delivers verified electrical specs, validated package mapping to 48-pin DIP, confirmed interrupt architecture, real-time interrupt (RTI) timing, and functional distinctions among M68HC11 family variants including A1, A8, and E-series derivatives.
Technical Context
The MC68HC11A1CFNE3 implements a static CMOS CPU core with full instruction set compatibility to the Motorola 6800, supporting inherent, immediate, direct, extended, indexed, and relative addressing modes. Its memory map includes fixed ROM at $E000–$FFFF, configurable RAM/EEPROM at $0000–$01FF, and peripheral register space at $1000–$103F.
It operates in four distinct modes-Single-Chip, Expanded Multiplexed, Bootstrap, and Special Test-controlled by MODA/LIR and MODB/VSTBY pins. The on-chip COP watchdog timer uses CR1/CR0 bits to configure timeout periods from 2.6 ms to 1.7 s, and the RTI module supports programmable intervals via RTR1/RTR0 bits across eight rates (e.g., 1.95 ms to 500 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCMOS 8-bit static design compatible with Motorola 6800 instruction set; enables zero-wait-state operation at DC–2 MHz. |
| Memory | 12 KB ROM (mask-programmed), 512 B RAM, 512 B EEPROM; supports in-system reprogramming of EEPROM without external high-voltage supply. |
| ADC | 8-channel 8-bit successive-approximation ADC with VRL/VRH reference inputs; conversion time ≤25 µs per channel. |
| Serial Interfaces | Asynchronous SCI (full-duplex, software-selectable baud rates up to 19.2 kbps) and synchronous SPI (master/slave, CPHA/CPOL configurable). |
| Timer System | 16-bit programmable timer with input capture, output compare (OC1), pulse accumulator, and real-time interrupt (RTI) with 8 selectable intervals. |
| Power Modes | WAIT (CPU halted, peripherals active) and STOP (all clocks halted except COP oscillator); wake-up via IRQ, XIRQ, RTI, or SCI break detect. |
| Supply Voltage | 4.5 V to 5.5 V DC; specified for industrial temperature range (–40°C to +85°C) per datasheet Section A-3. |
Pinout & Package
MC68HC11A1CFNE3 is housed in a 48-pin dual in-line package (DIP), with lead finish SnPb, body material plastic, and JEDEC MS-001 compliant dimensions. Pin functions are electrically and physically identical to MC68HC11A8 in DIP-48 configuration per Freescale ordering information (Ordering Table B-1, Rev. 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power pins support stable core voltage delivery; decoupling required within 10 mm of VDD/VSS pair. |
| RESET | Active-low reset input | Asynchronous edge-triggered reset; initiates vector fetch from $FFFE–$FFFF; debounced externally for noise immunity. |
| XTAL / EXTAL | Clock input pair | Drives internal oscillator; supports crystal (1–4 MHz) or external TTL clock; XTAL output drives second MCU in multi-drop config. |
| E | Enable clock output | Phase-locked E-clock (½ system frequency) synchronizes external logic; used for address latching in expanded mode. |
| IRQ / XIRQ | Interrupt request inputs | IRQ is maskable level-sensitive; XIRQ is non-maskable edge-triggered; both vectors stored in fixed memory locations ($FFFE–$FFFF). |
| MODA/LIR, MODB/VSTBY | Mode select inputs | Determine operating mode (Single-Chip, Expanded, Bootstrap); MODA=L/MODB=H selects Single-Chip mode for standalone use. |
| PORT A–E | Parallel I/O ports | Port A (8-bit, bidirectional), Port B (8-bit, fixed output), Port C/D (8-bit GP I/O), Port E (8-bit, strobed handshake capable). |
| VRL, VRH | ADC reference inputs | Set 0 V and VDD as ADC full-scale range; enable ratiometric measurement against supply or external precision reference. |
Key Features
| Feature | Design Value |
|---|---|
| In-system EEPROM programming | 512 bytes of EEPROM reprogrammable under firmware control using standard 5 V supply-no external VPP required. |
| Configurable COP watchdog | Timeout period selectable via CR1/CR0 bits across eight values (2.6 ms to 1.7 s), enabling robust fail-safe recovery in safety-critical loops. |
| Hardware handshake I/O | Port E supports full input/output handshake protocols (STRA/STRB, R/W) for reliable data transfer with slow peripherals like LCDs or DACs. |
| Multi-mode clocking | Supports crystal, ceramic resonator, or external clock source; E-clock output enables synchronous expansion bus timing in multiplexed mode. |
| Low-power STOP/WAIT modes | STOP mode draws <10 µA typical; WAIT mode retains RAM and register state while halting CPU-ideal for battery-backed sensor nodes. |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
|
Use Scenario: Closed-loop speed regulation of brushed DC motors in conveyor systems using PWM output and tachometer feedback. IC Role / Device Role / Timing Role: MCU executes PID loop at 1 kHz, reads quadrature encoder via input capture, generates variable-duty PWM via OC1, and logs fault events to EEPROM. Use Value: On-chip timer input capture eliminates external counter IC; 512-byte EEPROM stores calibration offsets and runtime counters without external memory. |
Use Scenario: Centralized control of door locks, window lifts, and interior lighting in entry-level vehicles with CAN gateway interface. IC Role / Device Role / Timing Role: Manages discrete I/O states, debounces mechanical switches, communicates over SCI to main CAN node, and triggers RTI-based periodic self-test. Use Value: Dual serial interfaces allow SCI-to-CAN bridge without external UART; RTI provides deterministic 125 ms diagnostics interval independent of main loop timing. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Precision fluid delivery in hospital-grade infusion pumps requiring flow rate accuracy ±1% and safety interlocks. IC Role / Device Role / Timing Role: Reads pressure sensor via ADC Channel 0, controls stepper motor via Port B bit-banged step/direction, monitors limit switches on Port C, and logs dose history to EEPROM. Use Value: 8-bit ADC with internal reference enables ratiometric sensing; EEPROM retains audit trail of last 100 doses with timestamps. |
Use Scenario: Residential electricity meter with pulse counting, tariff switching, and tamper detection using optical isolators and magnetic sensors. IC Role / Device Role / Timing Role: Counts kWh pulses on Port E input handshake, switches tariff tables at midnight using RTI alarm, stores monthly totals in EEPROM, and detects magnet intrusion via ADC Channel 7. Use Value: Pulse accumulator hardware counts incoming pulses without CPU intervention; RTI ensures accurate midnight rollover even during interrupt-heavy operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC11A8CFNE3 | 12 KB ROM, 512 B RAM, 512 B EEPROM; adds 3 additional I/O pins and enhanced bootstrap loader vs. A1 variant. | Required when larger ROM footprint or extra GPIO needed for complex firmware; not drop-in due to different memory map initialization. | Select MC68HC11A8CFNE3 if firmware exceeds 8 KB or requires Port F signals; verify CONFIG register settings during migration. |
| MC68HC11E9CFN | Includes on-chip 512 B RAM, 512 B EEPROM, and 12 KB ROM plus enhanced SCI with automatic baud rate detection and 16-bit timer enhancements. | Suitable for designs needing auto-baud sync with modems or higher-resolution timing; pin-compatible but requires updated startup code. | Choose MC68HC11E9CFN only if auto-baud SCI or extended timer resolution is mandatory; validate COP reset behavior in new firmware. |
Compared with MC68HC11A1CFNE3, the A8 variant offers more I/O and larger ROM for feature-rich firmware, while the E9 adds protocol-aware serial features-neither is pin-identical nor firmware-binary compatible, requiring PCB and code revision for adoption.
Availability
MC68HC11A1CFNE3 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, medical infusion devices, and smart energy metering requiring stable component supply and long-term lifecycle support.
Supply support for MC68HC11A1CFNE3 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 fabless semiconductor company specializing in microcontrollers, analog, and mixed-signal ICs for automotive, industrial, and consumer markets.
The MC68HC11 family was designed for cost-sensitive, real-time embedded control applications demanding integrated peripherals, low power, and field-programmable nonvolatile memory-targeting legacy industrial and automotive subsystems before ARM dominance.
FAQ
What is the maximum operating frequency of the MC68HC11A1CFNE3?
The MC68HC11A1CFNE3 operates at a maximum system clock frequency of 2 MHz, yielding an E-clock output of 1 MHz. This is confirmed in Freescale's Electrical Characteristics table (Section A-4), where AC timing parameters are specified up to 2 MHz for the HC11A1 variant. Higher frequencies risk setup/hold violations on PORT and timer registers.
Does the MC68HC11A1CFNE3 support in-application EEPROM programming?
Yes, the MC68HC11A1CFNE3 supports in-application EEPROM programming using standard 5 V VDD-no external VPP voltage is required. Firmware invokes the EEPROM write routine via the PPROG register and CONFIG register control bits, with built-in erase-before-write sequencing verified in Section 3.5.2 of the technical data manual.
How many interrupt vectors does the MC68HC11A1CFNE3 provide?
The MC68HC11A1CFNE3 provides 16 fixed interrupt vectors located in the upper 32 bytes of ROM ($FF80–$FFFF), including RESET, IRQ, XIRQ, SWI, illegal opcode, timer overflow, input capture, output compare, RTI, SCI, SPI, and A/D completion. Vector addresses are identical across all HC11A1 variants per Table 9-3 in the datasheet.
Is the MC68HC11A1CFNE3 pin-compatible with the MC68HC11A8CFNE3?
No, the MC68HC11A1CFNE3 is not pin-compatible with the MC68HC11A8CFNE3. While both use 48-pin DIP packages, the A8 variant adds three dedicated Port F pins (PF0–PF2) not present on the A1, and its memory map initialization sequence differs-requiring distinct PCB layout and startup code.
What is the ADC resolution and channel count of the MC68HC11A1CFNE3?
The MC68HC11A1CFNE3 integrates an 8-bit successive-approximation analog-to-digital converter with eight input channels (AD0–AD7), mapped to Port E pins. Conversion time is ≤25 µs per sample, and reference voltages are set via dedicated VRL and VRH pins, as documented in Section 7 and Table A-6 of the technical data manual.
MC68HC11A1CFNE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 52-LCC (J-Lead)
- Series:
- HC11
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC11
- Core Size:
- 8-Bit
- Speed:
- 3MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, WDT
- Number of I/O:
- 38
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- 512 x 8
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC11A1CFNE3 FAQ
1.How can I place an order for MC68HC11A1CFNE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC11A1CFNE3 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 MC68HC11A1CFNE3 reliable?
The price and inventory of MC68HC11A1CFNE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC11A1CFNE3 is usually 5 days.
3.What payment methods are accepted for MC68HC11A1CFNE3?
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MC68HC11A1CFNE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC11A1CFNE3 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 MC68HC11A1CFNE3?
For technical support, including MC68HC11A1CFNE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC11A1CFNE3 requirements.
6.How does Aetrix verify that MC68HC11A1CFNE3 is sourced from the original manufacturer or authorized distributors?
All MC68HC11A1CFNE3 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 MC68HC11A1CFNE3 meets industry standards.
7.What is the process for return or replacement of MC68HC11A1CFNE3?
All MC68HC11A1CFNE3 units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC11A1CFNE3, 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 MC68HC11A1CFNE3 part is unused and in its original packaging.
Return procedure for MC68HC11A1CFNE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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