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NXP Semiconductors MC68HC000EI12
- Part No.:
- MC68HC000EI12
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
MC68HC000EI12.pdf
- Description:
- IC MPU M680X0 12MHZ 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
MC68HC000EI12 from Freescale Semiconductor (formerly Motorola) is a CMOS 16/32-bit microprocessor with 32-bit internal architecture, 24-bit address bus (16 MB max), 16-bit data bus, and 12 MHz maximum clock frequency. It implements the full M68000 instruction set, supports supervisor/user privilege modes, and targets embedded control systems requiring deterministic real-time interrupt response and legacy system compatibility.
For engineers reviewing the MC68HC000EI12 datasheet, MC68HC000EI12 pinout, MC68HC000EI12 application, or MC68HC000EI12 equivalent, key selection criteria include bus timing compliance (asynchronous/synchronous modes), exception vector handling, DTACK/BERR handshake behavior, and thermal performance in industrial temperature range operation.
Technical Context
The MC68HC000EI12 executes instructions using a three-stage pipeline (fetch, decode, execute) and features a 16-bit external data bus with multiplexed address/data lines on pins AD0–AD15. Its bus interface supports asynchronous handshaking via DTACK, BERR, and HALT signals, enabling flexible memory and peripheral interfacing without fixed wait-state constraints.
It implements full M68000 programmer's model including 8 × 32-bit data/address registers, 16-bit status register with interrupt mask and mode bits, and 256-byte exception vector table starting at address $000000. Exception processing includes seven autovector levels, bus/address error recovery, and stack frame formats defined per exception type.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Clock Frequency | 12 MHz - Determines maximum instruction throughput and synchronous bus cycle rate. |
| Address Bus Width | 24-bit (A0–A23) - Supports up to 16 MB linear address space for program and data memory mapping. |
| Data Bus Width | 16-bit (AD0–AD15) - Multiplexed address/data bus reduces pin count; requires external latch for address capture. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial environments; thermal derating required above 70°C ambient. |
| Supply Voltage | +5 V ±5% - Single-rail CMOS operation; decoupling critical due to dynamic current spikes during bus cycles. |
| Interrupt Levels | 7-level autovector + TRAP - Enables prioritized real-time response to hardware events without software polling. |
| Exception Vector Base | $000000 - Fixed reset vector location; allows boot ROM placement at lowest memory address. |
Pinout & Package
MC68HC000EI12 uses a 68-pin PLCC (Plastic Leaded Chip Carrier) package, case 746-01 (LC suffix), with 0.050" lead pitch and body size 1.090" × 1.090". Pin numbering follows standard PLCC clockwise sequence starting from the index corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AD0–AD15 | Multiplexed Address/Data Bus | Carries lower 16 address bits during first clock phase, then 16-bit data; requires external latch (e.g., 74LS373) for address demultiplexing. |
| A16–A23 | Upper Address Bus | Dedicated non-multiplexed address lines for 24-bit addressing; used directly by memory/peripheral decoders. |
| DTACK | Data Transfer Acknowledge Input | Asynchronous handshake signal indicating external device readiness; low = valid data present on bus. |
| BERR | Bus Error Input | Indicates invalid bus cycle (e.g., unmapped address); triggers bus error exception and stack frame save. |
| HALT | Halt Request Input | Pauses CPU execution after current instruction; used for debug, power management, or bus arbitration coordination. |
| RESET | Reset Input | Active-low synchronous reset that initializes PC to $000000, SR to $2700, and disables interrupts. |
| Vcc / GND | Power Supply Terminals | Single +5 V supply; 12 dedicated Vcc and 12 GND pins distributed across package for noise reduction and current delivery. |
Key Features
| Feature | Design Value |
|---|---|
| Full M68000 Instruction Set Compatibility | Executes all original M68000 opcodes including MOVE, JSR, TRAP, and bit manipulation; enables drop-in replacement in legacy designs. |
| Supervisor/User Privilege Modes | Hardware-enforced separation of kernel and application code; prevents unauthorized memory access or register modification. |
| Asynchronous Bus Handshaking | DTACK/BERR/HALT signals allow interfacing with slow peripherals (e.g., UARTs, EPROMs) without fixed wait states or clock stretching. |
| Deterministic Exception Latency | Bus error, address error, and interrupt responses occur within fixed 3–5 cycle windows; critical for hard real-time control loops. |
| Industrial Temperature Range Operation | Validated operation from −40°C to +85°C with guaranteed timing margins; suitable for factory automation and transportation electronics. |
Applications
| Industrial PLC Controller | Legacy Medical Instrumentation |
|---|---|
Use Scenario: Programmable logic controller executing ladder logic scans with deterministic I/O update timing. IC Role / Device Role / Timing Role: Central execution unit managing scan cycle timing, discrete I/O mapping, and serial HMI communication. Use Value: 12 MHz clock and fixed exception latency ensure sub-10 ms scan times; 24-bit addressing supports modular I/O expansion up to 16 MB. |
Use Scenario: Embedded controller in FDA-cleared diagnostic equipment requiring long-term component availability and proven reliability. IC Role / Device Role / Timing Role: Main processor handling sensor acquisition, calibration routines, and RS-232 report generation. Use Value: CMOS process ensures low power and stable operation over 15+ year service life; M68000 ISA guarantees firmware maintainability. |
| Avionics Maintenance Terminal | Retro Computing Platform |
Use Scenario: Portable ground support equipment interfacing with aircraft subsystems via MIL-STD-1553 or ARINC-429 adapters. IC Role / Device Role / Timing Role: Host processor managing protocol translation, buffer management, and non-volatile configuration storage. Use Value: 7-level interrupt hierarchy supports concurrent bus arbitration and real-time response to maintenance command packets. |
Use Scenario: Hardware-accurate recreation of 1980s workstation architecture for software preservation and education. IC Role / Device Role / Timing Role: Cycle-accurate CPU core replicating original Macintosh Plus or Sun-2 timing behavior. Use Value: Identical instruction timing and bus protocol enable binary-compatible execution of vintage OS kernels and applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16/32-bit microprocessor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68EC000RC16 | Embedded variant with no A23 line (23-bit address bus), no DTACK/BERR, and 16 MHz max clock; lacks full bus exception signaling. | Suitable for cost-sensitive, memory-constrained designs where 8 MB address space suffices and external bus handshaking is unnecessary. | Select only if legacy M68000 compatibility is not required and system design can omit bus error recovery logic. |
| MC68000P12 | Bipolar TTL version; higher power consumption (typ. 1.5 W vs. 0.35 W), 12 MHz max, same pinout but incompatible DC specs and thermal profile. | Used in early 1980s systems where CMOS was unavailable; requires different power delivery and cooling strategy. | Choose only for exact field-replacement in vintage hardware; not recommended for new designs due to power and thermal limitations. |
Compared with MC68HC000EI12, the MC68EC000RC16 sacrifices bus robustness for integration and cost, while the MC68000P12 trades power efficiency for raw speed margin in TTL-compatible systems-neither offers full functional equivalence in modern industrial deployments.
Availability
MC68HC000EI12 is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy medical instrumentation, avionics maintenance terminals, and retro computing platforms requiring stable component supply and long-term lifecycle support.
Supply support for MC68HC000EI12 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 embedded processing, connectivity, and analog solutions for automotive, industrial, and networking markets.
The MC68HC000EI12 belongs to the M68000 family designed for high-reliability embedded control applications where instruction set compatibility, deterministic timing, and industrial temperature operation are mandatory design requirements.
FAQ
What is the maximum supported clock frequency for the MC68HC000EI12?
The MC68HC000EI12 is rated for a maximum clock frequency of 12 MHz under industrial temperature conditions (−40°C to +85°C). This rating assumes proper decoupling, stable +5 V ±5% supply, and adherence to AC timing specifications for input rise/fall times. Exceeding this frequency may result in undefined instruction execution or bus timing violations.
Does the MC68HC000EI12 support the full M68000 instruction set?
Yes, the MC68HC000EI12 implements the complete M68000 instruction set, including all addressing modes, arithmetic/logic operations, bit manipulation, and exception-handling instructions. It maintains binary compatibility with original M68000 code, enabling direct firmware reuse in upgraded CMOS-based systems.
What package type is used for the MC68HC000EI12?
The MC68HC000EI12 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), case number 746-01 (LC suffix), with dimensions 1.090" × 1.090" and 0.050" lead pitch. This surface-mount package provides mechanical robustness and thermal performance suitable for industrial PCB assembly.
How does the MC68HC000EI12 handle bus errors and exceptions?
The MC68HC000EI12 detects bus errors via the BERR input and responds by initiating a bus error exception: saving program counter and status register to the supervisor stack, loading vector $000008, and transferring control to the handler. Address errors, resets, and interrupts follow similarly defined stack frame formats and vector locations.
Is the MC68HC000EI12 suitable for new industrial designs today?
Yes, the MC68HC000EI12 remains viable for new industrial designs where long-term component availability, deterministic real-time behavior, and legacy software compatibility are critical. Its industrial temperature rating, proven reliability, and continued sourcing through authorized channels support multi-decade product lifecycles.
MC68HC000EI12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 68-LCC (J-Lead)
- Series:
- M680x0
- Packaging:
- Tube
- Product Status:
- Obsolete
- Core Processor:
- EC000
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 12MHz
- Co-Processors/DSP:
- -
- RAM Controllers:
- -
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- -
- SATA:
- -
- USB:
- -
- Voltage - I/O:
- 5.0V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
- Additional Interfaces:
- -
MC68HC000EI12 FAQ
1.How can I place an order for MC68HC000EI12 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC000EI12 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 MC68HC000EI12 reliable?
The price and inventory of MC68HC000EI12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC000EI12 is usually 5 days.
3.What payment methods are accepted for MC68HC000EI12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC000EI12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC000EI12?
MC68HC000EI12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC000EI12 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 MC68HC000EI12?
For technical support, including MC68HC000EI12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC000EI12 requirements.
6.How does Aetrix verify that MC68HC000EI12 is sourced from the original manufacturer or authorized distributors?
All MC68HC000EI12 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 MC68HC000EI12 meets industry standards.
7.What is the process for return or replacement of MC68HC000EI12?
All MC68HC000EI12 units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC000EI12, 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 MC68HC000EI12 part is unused and in its original packaging.
Return procedure for MC68HC000EI12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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