MC68HC11E1CFNE3R - 8-Bit 3MHz MCU 512B EE ROMless PLCC-52 | NXP
MPN: MC68HC11E1CFNE3R ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.8 | $9,800.00 |
MC68HC11E1CFNE3R Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and programmable peripherals on one die. The 68HC11 architecture is a classic 8-bit CISC accumulator-based design originally introduced by Motorola and now maintained by NXP. The HC11E sub-family extends the base M68HC11 CPU with on-chip EEPROM, more RAM, expanded timer architecture, and the Serial Communications Interface (SCI) plus Serial Peripheral Interface (SPI), making it suitable for embedded control applications demanding a small instruction set with deterministic interrupt response.
Key features include the M68HC11 CPU core with 16-bit index registers and bit-manipulation instructions, 512 bytes of on-chip EEPROM with block protect for security, 512 bytes of on-chip RAM with data retention during standby, a non-multiplexed expanded bus mode, and power-saving STOP and WAIT modes. Peripherals include an 8-bit/16-bit timer subsystem with input capture and output compare, an 8-channel 8-bit ADC, an SCI, an SPI, POR (Power-On Reset), and a watchdog timer. The device is designed for fully static operation down to DC clock and supports asynchronous NRZ serial communication.
Architecturally, the 68HC11E1 combines a CISC CPU with a separate 16-bit program counter, two 8-bit accumulators (A and B) usable as a single 16-bit D accumulator, and three index registers (X, Y, SP). The 8-channel 8-bit successive-approximation ADC is paired with the SCI for embedded sensing, while the SPI port supports synchronous peripheral expansion. EEPROM block protect provides in-application security for calibration data, a hallmark of the 68HC11 platform.
Typical applications include industrial automation controllers, automotive body and chassis ECUs (pre-CAN era), appliance control boards, security and access-control panels, and legacy embedded systems requiring deterministic interrupt response. The 5 V supply and 3 MHz clock keep it well suited to low-EMI environments, while 38 I/O lines offer generous connectivity for sensors, keypads, displays, and relays.
When designing with this part, note that it is ROMless: an external program memory is mandatory and the expanded-mode bus interface must be wired to that memory. Ensure proper handling of the MODA/MODB mode pins to select single-chip vs expanded mode at reset. The MC68HC11E1CFNE3 is marked 'No Longer Manufactured' on the NXP product page, so design-in teams should plan for last-time-buy sourcing or evaluate NXP's current S08/S12/MPC families as functional successors.
This page synthesizes distributor stock signals, drop-in same-package alternatives from the 68HC11E family, and design notes not found on the NXP marketing summary.
Drop-in alternatives for MC68HC11E1CFNE3R — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC68HC11E1CFNE3R (same form factor and footprint) — differing in Package, Mounting Type, Supply Voltage, EEPROM, Program Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HC11E1CFNE2R
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11E1CFNE3
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11E0CFNE3
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →MC68HC11E0CFNE2
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HCP11E1CFNE3
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11E1CFNE3R Maximum Ratings & Electrical Characteristics
| Core Processor | HC11 |
| Core Size | 8-Bit |
| Core Architecture | CISC |
| Maximum Clock Speed | 3 MHz |
| Program Memory Size | ROMless (none on-chip) |
| Program Memory Type | ROMless |
| EEPROM Size | 512 x 8 bytes |
| RAM Size | 512 x 8 bytes |
| Number of I/O | 38 |
| Connectivity | SCI, SPI |
| Peripherals | POR, WDT |
| Supply Voltage | 5 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 52-PLCC (FN) 19.1 x 19.1 mm |
| Mounting Type | Surface Mount |
| Data Bus Width | 8-Bit |
| Packaging | Tape & Reel (R suffix) |
MC68HC11E1CFNE3R Pin Configuration
| Pin 1 | IRQ — Maskable interrupt request |
| Pin 2 | PA7 — Port A bit 7 / timer I/O |
| Pin 3 | PA6 — Port A bit 6 |
| Pin 4 | PA5 — Port A bit 5 |
| Pin 5 | PA4 — Port A bit 4 |
| Pin 6 | PA3 — Port A bit 3 |
| Pin 7 | PA2 — Port A bit 2 |
| Pin 8 | PA1 — Port A bit 1 |
| Pin 9 | PA0 — Port A bit 0 |
| Pin 10 | PB7 — Port B bit 7 |
| Pin 11 | PB6 — Port B bit 6 |
| Pin 12 | PB5 — Port B bit 5 / OC1 |
| Pin 13 | PB4 — Port B bit 4 / OC2 |
| Pin 14 | PB3 — Port B bit 3 / OC3 |
| Pin 15 | PB2 — Port B bit 2 / OC4 |
| Pin 16 | PB1 — Port B bit 1 / OC5 |
| Pin 17 | PB0 — Port B bit 0 / OC6 |
| Pin 18 | PC0 — Port C bit 0 / ADDR8 |
| Pin 19 | PC1 — Port C bit 1 / ADDR9 |
| Pin 20 | PC2 — Port C bit 2 / ADDR10 |
| Pin 21 | PC3 — Port C bit 3 / ADDR11 |
| Pin 22 | PC4 — Port C bit 4 / ADDR12 |
| Pin 23 | PC5 — Port C bit 5 / ADDR13 |
| Pin 24 | PC6 — Port C bit 6 / ADDR14 |
| Pin 25 | PC7 — Port C bit 7 / ADDR15 |
| Pin 26 | PD0 — Port D bit 0 / RxD |
| Pin 27 | PD1 — Port D bit 1 / TxD |
| Pin 28 | PD2 — Port D bit 2 |
| Pin 29 | PD3 — Port D bit 3 |
| Pin 30 | PD4 — Port D bit 4 |
| Pin 31 | PD5 — Port D bit 5 / SS |
| Pin 32 | PD6 — Port D bit 6 / SCK |
| Pin 33 | PD7 — Port D bit 7 / MOSI |
| Pin 34 | PE0 — Port E bit 0 / ADC0 |
| Pin 35 | PE1 — Port E bit 1 / ADC1 |
| Pin 36 | PE2 — Port E bit 2 / ADC2 |
| Pin 37 | PE3 — Port E bit 3 / ADC3 |
| Pin 38 | PE4 — Port E bit 4 / ADC4 |
| Pin 39 | PE5 — Port E bit 5 / ADC5 |
| Pin 40 | PE6 — Port E bit 6 / ADC6 |
| Pin 41 | PE7 — Port E bit 7 / ADC7 |
| Pin 42 | XIRQ — Non-maskable interrupt |
| Pin 43 | MODB — Mode select B |
| Pin 44 | MODA — Mode select A |
| Pin 45 | RESET — Reset input, active low |
| Pin 46 | VRH — ADC high reference |
| Pin 47 | VRL — ADC low reference |
| Pin 48 | E — E clock output |
| Pin 49 | XOSC1 — Crystal oscillator input |
| Pin 50 | XOSC2 — Crystal oscillator output |
| Pin 51 | VDD — +5 V supply |
| Pin 52 | VSS — Ground |
Typical Applications
MC68HC11E1CFNE3R is suitable for 6 applications: Industrial Automation Controllers, Automotive Body Electronics ECUs, Appliance Control Boards, Security and Access Control Panels, Point-of-Sale Terminals and Card Readers, Medical Monitoring Devices.
Industrial Automation Controllers
The MC68HC11E1CFNE3R is a strong fit for legacy industrial controllers thanks to its 8-bit HC11 CISC core at 3 MHz, 38 GPIO lines, on-chip 8-channel ADC, SCI, and SPI. The 512-byte EEPROM is used for retention of calibration constants and operating hours, while STOP/WAIT modes support low standby current. Pair it with an external EPROM for program storage in expanded mode and a 2-wire RS-485 driver for fieldbus connectivity.
Recommended
Automotive Body Electronics ECUs
Pre-CAN body ECUs - window lift, mirror control, seat control, instrument clusters - historically used the 68HC11E1 for its rugged industrial temperature range and deterministic interrupt response. The 38 GPIO drive relays, H-bridges, and LED banks directly, while the on-chip ADC reads battery voltage, thermistors, and position feedback. The -40C to +85C industrial rating covers cabin electronics, while the external bus supports mask ROM or external flash for code storage.
Recommended
Appliance Control Boards
White-goods controllers - washing machines, dishwashers, HVAC thermostats - leverage the HC11's I/O count and EEPROM block protect for storing wash-cycle parameters and tamper-resistant settings. The on-chip 8-bit ADC samples temperature sensors and water level, the timer subsystem generates PWM for motor control, and the SCI interfaces to LED or VFD displays. The 5 V single supply simplifies the analog front end for sensor conditioning.
Recommended
Security and Access Control Panels
Keypad-based alarm panels and door controllers benefit from the 38 GPIO for matrix keypads, relay drivers, siren outputs, and zone inputs. The 512-byte EEPROM stores installer codes, zone configurations, and event logs - protected by the hardware block protect feature. The SCI provides a serial link to central monitoring stations, and the on-chip watchdog prevents firmware lockup. External program memory holds the main application code.
Recommended
Point-of-Sale Terminals and Card Readers
Legacy POS terminals and magnetic-stripe card readers used the 68HC11E1 as a keyboard/display controller thanks to its generous GPIO count and integrated peripherals. The SCI links to the main terminal CPU, the SPI drives an alphanumeric LCD or dot-matrix display, and the timer subsystem generates beep tones. EEPROM stores terminal ID, encryption keys, and configuration parameters protected by the block-protect fuse.
Recommended
Medical Monitoring Devices
Low-risk medical monitoring devices - blood-pressure cuffs, thermometers, infusion pump controllers in legacy designs - use the HC11E1 for its deterministic interrupt handling and proven long-term silicon reliability. The 8-channel ADC digitizes sensor signals, the EEPROM stores calibration tables, and the SCI connects to bedside monitors. The 5 V single supply simplifies analog signal conditioning circuits. For new designs, migrate to a modern Cortex-M or S12 MCU with active longevity.
Recommended
Recommended Products Summary
Engineering reference data for MC68HC11E1CFNE3R — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC11E1CFNE2R | MC68HC11E0CFNE3 | MC68HC11E0CFNE2 | MC68HCP11E1CFNE3 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 52-PLCC (FN) | 52-PLCC (FN) - same | 52-PLCC (FN) - same | 52-PLCC (FN) - same | 52-PLCC (FN) - same |
| Core / Speed | HC11 8-bit, 3 MHz | HC11 8-bit, 3 MHz | HC11 8-bit, 3 MHz | HC11 8-bit, 3 MHz | HC11 8-bit, 3 MHz |
| RAM | 512 bytes | 512 bytes | 512 bytes | 256 bytes | 512 bytes |
| EEPROM | 512 bytes | 2 KB | None (512 B ROM) | None (256 B ROM) | 512 bytes |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 3.0-5.5 V (low-voltage) |
| GPIO Count | 38 | 38 | 38 | 38 | 38 |
| Lifecycle Status | Last Time Buy (No Longer Manufactured) | Obsolete / NFM | Last Time Buy | Last Time Buy | Last Time Buy |
Key Differentiators
- Larger EEPROM density in same package (vs MC68HC11E1CFNE2R)
- EEPROM available vs ROM-only (vs MC68HC11E0CFNE3)
- Standard 5 V supply vs wide-range low-voltage variant (vs MC68HCP11E1CFNE3)
- Tape & Reel ready vs tray packaging (vs MC68HC11E1CFNE3)
Design Notes
Estimated: at 5 V supply, the HC11E1 in active mode draws roughly 15-25 mA depending on peripheral use, falling below 50 uA in STOP mode with the watchdog disabled. Bulk-decouple VDD with at least a 10 uF tantalum plus a 100 nF ceramic placed within 25 mm of the VDD pin, and ensure the PLL/oscillator analog supply (AVDD if separate) is filtered separately. The internal POR requires VDD ramp time within 100 ms for reliable reset.
The MC68HC11E1 is ROMless in CFNE3R: external program memory must be wired on the expanded bus, or the device must be reconfigured via the MODA/MODB pins for single-chip mode (in which case the part must be sourced with internal ROM - E0 variants). Misconfiguring the mode pins or missing an external EPROM will cause the part to execute garbage vectors on reset.
Estimated: in a 52-PLCC package the HC11E1 typically dissipates under 250 mW at 3 MHz, so a thermal heatsink is unnecessary. Theta_JA is roughly 50-60 C/W, so worst-case junction-to-ambient rise is below 15 C. Ensure ambient stays below the 85 C industrial limit and watch for self-heating only if clock is overclocked above the 3 MHz rating.
The E clock output carries a 3 MHz (or OSC/2) square wave that can couple into adjacent analog traces; route analog inputs (port E ADC) away from the E clock net and keep the E clock trace short. If the oscillator is a crystal, place the load capacitors within 5 mm of XOSC1/XOSC2 and keep digital traces clear of the crystal body.
Compliance Information
Compliance status not stated in the verified web data for this discontinued MCU; consult NXP product environmental compliance reports for definitive RoHS/REACH status.
