NXP Semiconductors MC68EC000EI10

Overview

MC68EC000EI10 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 10 MHz. It serves as the central execution unit in cost-sensitive industrial controllers, point-of-sale terminals, and legacy instrumentation systems requiring deterministic real-time response.

For engineers reviewing the MC68EC000EI10 datasheet, MC68EC000EI10 pinout, MC68EC000EI10 application, or MC68EC000EI10 equivalent, key selection criteria include its lack of memory management hardware, 10 MHz maximum clock frequency, 68-pin PLCC package, compatibility with standard M68000 software binaries, and suitability for ROM-based boot and minimal peripheral interface designs.

Technical Context

The MC68EC000EI10 implements the full M68000 integer instruction set-including data movement, arithmetic, logical, bit manipulation, and program control instructions-with identical addressing modes (register direct, absolute short/long, PC-relative, indexed, etc.) and condition code behavior as the MC68000. It supports supervisor/user privilege levels and exception vectoring via a 256-byte vector table starting at address $000000.

It executes instructions using a three-stage pipeline (fetch, decode, execute) and requires external bus arbitration logic for multi-master systems. The processor asserts AS, DTACK, and BERR signals for synchronous bus timing and supports both little-endian and big-endian data ordering depending on external strap configuration.

Key Specifications

Pinout & Package

MC68EC000EI10 is housed in a 68-pin PLCC (Plastic Leaded Chip Carrier) package with J-lead terminations, designed for socketed or surface-mount PCB assembly. Pin numbering follows standard PLCC convention (Pin 1 marked by corner notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EC000FN10 and MC68000P10, the MC68EC000EI10 offers optimal balance of surface-mount reliability, thermal performance in constrained enclosures, and direct compatibility with existing PLCC-based industrial control hardware.

Availability

MC68EC000EI10 is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy point-of-sale terminals, and embedded test instruments requiring stable component supply across extended product lifecycles.

Supply support for MC68EC000EI10 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) pioneered the M68000 architecture and delivered high-reliability microprocessors for industrial, automotive, and aerospace markets from the 1980s onward.

The MC68EC000EI10 belongs to the M68000 Family Embedded Controller line, designed specifically for cost-sensitive, ROM-based embedded systems where MMU/FPU overhead is unnecessary and long-term component availability is critical.

FAQ

What is the maximum operating frequency of the MC68EC000EI10?

The MC68EC000EI10 is rated for a maximum clock frequency of 10 MHz under specified voltage and temperature conditions. This frequency determines the worst-case instruction cycle time (100 ns) and constrains memory access timing budgets. Operation above 10 MHz is not guaranteed and may result in undefined behavior or data corruption. The MC68EC000EI10 does not support dynamic frequency scaling or overclocking features.

Does the MC68EC000EI10 include an integrated memory management unit (MMU)?

No, the MC68EC000EI10 does not include an on-chip MMU. It provides a flat 24-bit address space (16 MB) with no virtual memory, paging, or protection features beyond supervisor/user mode privilege separation. System designers must implement external memory mapping or rely on fixed-address peripheral and ROM/RAM layouts. This distinguishes the MC68EC000EI10 from later M68000-family members like the MC68020 or MC68030.

Is the MC68EC000EI10 pin-compatible with the standard MC68000?

No, the MC68EC000EI10 is not pin-compatible with the MC68000. While both share the same instruction set, the MC68EC000EI10 uses a 68-pin PLCC package with a distinct pinout optimized for embedded use (e.g., dedicated VPA, HALT, and simplified bus control), whereas the MC68000 uses a 64-pin DIP or PGA package with multiplexed address/data lines and different control signal assignments.

What development tools support the MC68EC000EI10?

The MC68EC000EI10 is supported by legacy Motorola development tools including the M68K assembler (ASM68K), linker (LINK68K), and debugger (DBUG). It also runs firmware compiled for the MC68000 using GNU GCC cross-compilers targeting m68k-elf. Emulation and in-circuit debugging require compatible JTAG adapters or BDM interfaces designed for the M68000 family architecture.

Can the MC68EC000EI10 execute code from external flash memory?

Yes, the MC68EC000EI10 can execute code directly from external flash memory mapped into its 16 MB address space. Its synchronous bus interface supports wait-state insertion via the DTACK signal, allowing reliable operation with common parallel NOR flash devices. Boot initialization begins at address $000000, where the reset vector must be located-typically implemented in flash or mask ROM.