NXP Semiconductors MC68302CEH16C

Overview

MC68302CEH16C from Freescale Semiconductor is an integrated multi-protocol communications processor featuring an MC68000/MC68008 microprocessor core, a dedicated RISC-based communications processor (CP), and system integration block (SIB). It operates at 16 MHz, includes 1152 bytes of on-chip dual-port RAM, three full-duplex Serial Communication Controllers (SCCs), and supports HDLC/SDLC, UART, Bisync, DDCMP, and Totally Transparent protocols - deployed in ISDN terminal adapters and line cards.

For engineers reviewing the MC68302CEH16C datasheet, MC68302CEH16C pinout, MC68302CEH16C application, or MC68302CEH16C equivalent, key selection considerations include its 16 MHz clock rating, SCC protocol flexibility, dual-port RAM accessibility, and HCMOS TQFP-132 package compatibility with legacy Motorola/Freescale toolchains and debug infrastructure.

Technical Context

The MC68302CEH16C integrates a tightly coupled MC68000/MC68008 CPU core with a separate RISC-based communications processor that handles protocol processing independently. Its architecture enables concurrent execution of multiple serial protocols via three SCCs and two SMCs, each with dedicated serial DMA channels and configurable physical interfaces for IDL, GCI, PCM, and NMSI.

System-level features include an interrupt controller with low-latency response, four programmable chip-select lines with wait-state logic, DRAM refresh control, hardware watchdog for bus activity monitoring, and freeze-debug capability for on-chip peripherals - all coordinated through the System Integration Block and on-chip clock generator.

Key Specifications

Pinout & Package

MC68302CEH16C is housed in a 132-pin Thin Quad Flat Pack (TQFP) with 0.4 mm lead pitch, thermally enhanced for sustained operation in networking equipment. Pin assignments follow Freescale's MC68302 Family Pinout Specification Rev. 3 (2001).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-protocol communications processor applications.

Compared with MC68EN302 and MC68QH302, the MC68302CEH16C offers optimal balance of serial protocol flexibility, compact 132-pin TQFP packaging, and proven deployment in cost-sensitive ISDN and modem applications - without over-provisioning Ethernet or dual-SCC resources.

Availability

MC68302CEH16C is available at Aetrix Electronics and suitable for ISDN terminal adapters, data concentrators, and modem line cards requiring stable component supply and long-term industrial lifecycle support.

Supply support for MC68302CEH16C 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) designed high-reliability communications processors for telecom infrastructure and industrial networking.

The MC68302 product line was engineered to integrate CPU, protocol acceleration, and system control in a single HCMOS device for ISDN, modem, and bridge applications - reducing design complexity and bill-of-materials cost.

FAQ

What is the maximum operating frequency of the MC68302CEH16C?

The MC68302CEH16C is rated for 16 MHz operation, as indicated by the "16" suffix in its part number. This frequency governs instruction cycle timing, SCC baud rate generation accuracy, and real-time response limits for protocol processing. The device does not support overclocking beyond this specification, and timing margins assume operation within Freescale's validated voltage and temperature ranges.

Does the MC68302CEH16C include on-chip memory, and what type?

Yes, the MC68302CEH16C integrates 1152 bytes of on-chip dual-port static RAM. This memory is independently accessible by both the MC68000 core and the RISC communications processor, enabling zero-wait-state data exchange between CPU and protocol engines - a key enabler for low-latency packet handling in the MC68302CEH16C.

Which serial protocols are natively supported by the SCCs in the MC68302CEH16C?

The three Serial Communication Controllers (SCCs) in the MC68302CEH16C natively support HDLC/SDLC, UART, Bisync, DDCMP, Totally Transparent, and V.110 protocols. These are implemented in hardware within the RISC communications processor and require no external protocol ICs - confirmed in Freescale's MC68302 User's Manual and Technical Data Sheet for MC68302CEH16C.

Is the MC68302CEH16C pin-compatible with other MC68302 derivatives like the MC68QH302?

No, the MC68302CEH16C is not pin-compatible with the MC68QH302. Although both share architectural lineage, the MC68QH302 uses a 144-pin TQFP package versus the 132-pin TQFP of the MC68302CEH16C, and pin assignments differ significantly - including additional SCC signals and re-routed address/data bus lines. Board-level redesign is required for substitution.

What debug and development tools are supported for the MC68302CEH16C?

The MC68302CEH16C benefits from mature third-party tool support including Motorola/Freescale's CodeWarrior IDE, P&E Micro's BDM debug probes, and GNU GCC cross-compilation toolchains targeting the 68k architecture. Freescale also provided official evaluation boards, application notes, and sample code specifically validated for MC68302CEH16C use cases such as ISDN terminal adapters.