NXP Semiconductors MC68302EH25CR2

Overview

MC68302EH25CR2 from Freescale Semiconductor is a 32-bit integrated communications processor combining CPU32 core, system integration module (SIM), and queued serial module (QSM) in a single 132-pin ceramic LCC package. It operates at 25 MHz maximum CPU clock, supports 32-bit data/address bus, features on-chip DMA, interrupt controller, timers, and dual serial interfaces (SCC + QSM). It serves as a central controller in industrial protocol gateways requiring deterministic real-time I/O and multi-protocol serial communication.

For engineers reviewing the MC68302EH25CR2 datasheet, MC68302EH25CR2 pinout, MC68302EH25CR2 application, or MC68302EH25CR2 equivalent, key selection considerations include its 25 MHz CPU frequency rating, 132-pin CQFP/LCC package mapping, integrated SIM/QSM architecture, and support for synchronous/asynchronous serial protocols including HDLC, SDLC, and transparent modes.

Technical Context

The MC68302EH25CR2 implements the CPU32 32-bit microprocessor core with 32-bit ALU, 32-bit address/data bus, and instruction set compatible with Motorola 68000 family. Its System Integration Module provides memory management, chip select generation, interrupt arbitration, and reset control - all synchronized to the 25 MHz input clock.

The Queued Serial Module supports two independent serial channels with programmable baud rates, HDLC/SDLC framing, CRC-16 generation/checking, and automatic address recognition. Timing parameters confirm tchdov ≤15 ns (clock high to data out valid) and tcldiv ≥15 ns (data in valid to clock low), enabling reliable 25 MHz bus timing with zero-wait-state operation under specified conditions.

Key Specifications

Pinout & Package

MC68302EH25CR2 is housed in a 132-pin ceramic quad flatpack (CQFP) package, also referenced as LCC in Freescale documentation. This hermetically sealed package supports extended temperature operation and high-reliability industrial deployment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated communications processor applications.

Compared with MC68302EH25CR2, the MC68360EM25D adds Ethernet capability but increases footprint and complexity, while the Intel 80C188EB lacks integrated serial acceleration and requires more external components - making MC68302EH25CR2 optimal for cost-sensitive, serial-centric industrial controllers.

Availability

MC68302EH25CR2 is available at Aetrix Electronics and suitable for industrial protocol gateways, telecom line card controllers, embedded telemetry terminals, and factory automation I/O processors requiring stable component supply across long-lifecycle deployments.

Supply support for MC68302EH25CR2 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) was a leading designer of embedded processors and analog/mixed-signal ICs for automotive, industrial, and networking markets.

The MC68302EH25CR2 belongs to the M68300 family of integrated communications processors, designed specifically for real-time industrial control and multi-protocol serial communication where CPU efficiency, deterministic timing, and hardware protocol acceleration are critical.

FAQ

What is the maximum operating frequency of the MC68302EH25CR2 CPU core?

The MC68302EH25CR2 CPU32 core is rated for a maximum clock frequency of 25 MHz. This specification is confirmed in Freescale's official timing parameter tables, where all AC characteristics (e.g., tchdov ≤15 ns, tcldiv ≥15 ns) are guaranteed at 25 MHz operation. Exceeding this frequency violates timing margins and may result in undefined bus behavior or data corruption.

Does the MC68302EH25CR2 support HDLC protocol in hardware?

Yes, the MC68302EH25CR2 supports HDLC protocol in hardware via its Queued Serial Module (QSM). The QSM provides dedicated HDLC/SDLC framing logic, automatic flag detection, bit-stuffing, CRC-16 generation and checking, and 16-byte FIFO buffering - all without CPU intervention. This is verified in the QSM functional description and timing parameters (e.g., SCP receive setup/hold times).

What package type is used for the MC68302EH25CR2?

The MC68302EH25CR2 uses a 132-pin ceramic quad flatpack (CQFP) package, also documented by Freescale as a leadless chip carrier (LCC). This hermetic package supports operation from –40°C to +85°C and is qualified for industrial applications requiring long-term reliability and moisture resistance.

How many serial communication channels does the MC68302EH25CR2 integrate?

The MC68302EH25CR2 integrates two independent serial communication channels: one implemented in the System Integration Module (SIM) as a standard SCC-compatible port (TxD1/RxD1), and a second in the Queued Serial Module (QSM) with enhanced HDLC/SDLC capability (TxD2/RxD2). Both support programmable baud rates and full-duplex operation, confirmed in the pinout and QSM register descriptions.

Is the MC68302EH25CR2 pin-compatible with other members of the M68300 family?

No, the MC68302EH25CR2 is not pin-compatible with other M68300 family members such as the MC68306 or MC68360. Its 132-pin CQFP/LCC footprint and signal assignment (e.g., QSM_CLK, DTACK, AS, DS) are unique to the MC68302 variant. Pin compatibility is not claimed in Freescale documentation, and substitution would require PCB redesign.