NXP Semiconductors MC68EC000EI12R2

Overview

MC68EC000EI12R2 from Motorola is a 16-/32-bit embedded controller CPU implementing the M68000 instruction set architecture, featuring a 32-bit internal data path, 24-bit address bus (16 MB address space), no on-chip MMU or FPU, and operation at up to 12 MHz. It targets cost-sensitive industrial control, instrumentation, and legacy embedded systems requiring ROM-based boot and minimal peripheral integration.

For engineers reviewing the MC68EC000EI12R2 datasheet, MC68EC000EI12R2 pinout, MC68EC000EI12R2 application, or MC68EC000EI12R2 equivalent, key selection considerations include its 12 MHz maximum clock frequency, lack of memory management unit, 68-pin PGA package, support for asynchronous memory interfaces, and compatibility with M68000-family development tools and software stacks.

Technical Context

The MC68EC000EI12R2 implements the full M68000 integer instruction set with 32-bit registers (D0–D7, A0–A7), 24-bit linear addressing, and supervisor/user privilege modes. It executes instructions in a three-stage pipeline (fetch, decode, execute) and supports vectorized exception handling including bus error, address error, and trap vectors.

It uses asynchronous external bus timing with separate read/write strobes (R/W̅, DS̅, AS̅), requires external latching for address/data multiplexing, and relies on external logic for interrupt acknowledge cycles (IPL0–IPL2). No on-chip cache, no FPU, and no MMU distinguish it from later M68000-family members like the MC68EC030 or MC68EC040.

Key Specifications

Pinout & Package

MC68EC000EI12R2 is housed in a 68-pin ceramic Pin Grid Array (PGA) package with 0.1-inch pin spacing, designed for socketed insertion into industrial backplane or prototyping boards. Thermal and mechanical characteristics align with MIL-STD-883 Class B requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar embedded controller applications.

Compared with MC68EC000EI12R2, the MC68EC000FN16R2 offers higher performance at the cost of increased power and incompatible packaging, while the MC68HC000P12 delivers identical timing and footprint with significantly lower active power - making it optimal for energy-constrained deployments without sacrificing software or hardware compatibility.

Availability

MC68EC000EI12R2 is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy test equipment, embedded HMI terminals, ruggedized data loggers, and instrumentation systems requiring stable component supply across extended product lifecycles.

Supply support for MC68EC000EI12R2 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

Motorola Semiconductor (now part of NXP Semiconductors) was a pioneering developer of 32-bit microprocessors and embedded controllers, known for the M68000 family and foundational contributions to embedded computing architecture.

The MC68EC000EI12R2 belongs to Motorola's Embedded Controller (EC) subfamily, designed specifically for cost-sensitive, non-MMU industrial and instrumentation applications where software compatibility with the M68000 ISA is essential but advanced features like caching or virtual memory are unnecessary.

FAQ

What is the maximum operating frequency of the MC68EC000EI12R2?

The MC68EC000EI12R2 is rated for a maximum clock frequency of 12 MHz under industrial temperature conditions (–40°C to +85°C) and nominal +5 V supply. This speed defines its instruction execution rate, bus timing budgets, and peripheral interface limits. Exceeding 12 MHz may result in timing violations, especially with asynchronous peripherals relying on DTACK̅ handshaking. The MC68EC000EI12R2 does not support PLL-based clock multiplication.

Does the MC68EC000EI12R2 include an on-chip memory management unit (MMU)?

No, the MC68EC000EI12R2 does not include an on-chip MMU. It provides a flat 24-bit address space (16 MB) with no hardware support for virtual memory, paging, or memory protection. Memory management must be implemented in software or via external logic. This distinguishes the MC68EC000EI12R2 from later M68000-family members such as the MC68EC030 or MC68EC040, which integrate paged MMUs.

What package type is used for the MC68EC000EI12R2?

The MC68EC000EI12R2 is packaged in a 68-pin ceramic Pin Grid Array (PGA) with 0.1-inch pin pitch. This through-hole package is designed for high-reliability industrial applications and socketed prototyping. It is mechanically and electrically incompatible with PLCC or QFP variants such as the MC68EC000FN16R2 (84-pin PLCC) or MC68EC000RC16 (QFP), despite functional similarity.

Can the MC68EC000EI12R2 execute code from external ROM without additional support logic?

Yes, the MC68EC000EI12R2 supports ROM-based boot and execution directly from external memory. Its asynchronous bus interface, vector fetch capability, and RESET-initiated vector table read ($000000) allow standalone operation with only a ROM (e.g., 27C512), address latch (e.g., 74LS373), and basic decode logic. No external MMU or cache controller is required for basic program execution.

Is the MC68EC000EI12R2 pin-compatible with the standard MC68000?

No, the MC68EC000EI12R2 is not pin-compatible with the original MC68000. While both use 68-pin packages, the MC68000 employs a 64-pin DIP, whereas the MC68EC000EI12R2 uses a 68-pin PGA with different pin assignments - particularly for bus control signals (e.g., AS̅, DS̅) and interrupt encoding. Software is compatible, but hardware adaptation is required for replacement.