NXP Semiconductors MC68EN360CRC25L

Overview

MC68EN360CRC25L from Freescale Semiconductor is a quad integrated communications controller (QUICC) featuring a 32-bit CPU32+ core, dual-port RAM, and an independent Communications Processor Module (CPM) with four serial channels (SCC/SMC), supporting HDLC, UART, BISYNC, and transparent protocols. It operates at 25 MHz, uses a 244-pin PGA package, and targets industrial networking and telecom edge equipment requiring deterministic real-time protocol handling.

For engineers reviewing the MC68EN360CRC25L datasheet, MC68EN360CRC25L pinout, MC68EN360CRC25L application, or MC68EN360CRC25L equivalent, this page delivers verified architecture details, CPM register mapping, SIM60 bus timing, CPU32+ exception handling, and validated alternative parts for legacy QUICC-based router and base station designs.

Technical Context

The MC68EN360CRC25L integrates a CPU32+ core with 32-bit address/data bus, 8 KB on-chip dual-port RAM shared between CPU and CPM, and a System Integration Module (SIM60) managing memory mapping, interrupt arbitration, and bus control. Its CPM executes microcode independently to offload serial protocol processing-including HDLC frame assembly, CRC-16 generation, and bit-stuffing-freeing the CPU for application tasks.

Clock operation supports external crystal (4–33 MHz) or TTL clock input; MODCK1–MODCK0 pins configure PLL multiplication to achieve internal 25 MHz core frequency. The device implements IEEE 1149.1 JTAG test access port for boundary-scan and debug, and supports both master and slave bus modes via BR/BG signals.

Key Specifications

Pinout & Package

MC68EN360CRC25L is housed in a 244-pin Pin Grid Array (PGA) package with 12×12 pin layout, 2.54 mm pitch, and ceramic substrate optimized for thermal stability in industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EN360CRC25L, MC68360RC25L offers identical functionality in commercial grade, while MPC860TBCZQ50D provides architectural evolution at the cost of software rework - making the former ideal for lifecycle continuity and the latter for next-generation feature expansion.

Availability

MC68EN360CRC25L is available at Aetrix Electronics and suitable for industrial protocol gateways, telecom base station controllers, legacy router control planes, and secure SCADA terminal servers requiring stable component supply across extended product lifecycles.

Supply support for MC68EN360CRC25L 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, specializing in automotive, industrial, and networking solutions before its 2015 acquisition.

The MC68EN360CRC25L belongs to the QUICC family - engineered specifically for deterministic real-time communications processing in space-constrained, reliability-critical edge systems where protocol offload and low-latency I/O are essential.

FAQ

What is the operating temperature range for the MC68EN360CRC25L?

The MC68EN360CRC25L is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in Section 11 (Ordering Information and Mechanical Data) of the MC68360 User's Manual and applies specifically to the "EN" suffix variant. The wider range ensures reliable operation in outdoor telecom enclosures and factory-floor control cabinets where ambient conditions exceed commercial limits. MC68EN360CRC25L maintains full electrical compliance across this range without derating.

Does the MC68EN360CRC25L support JTAG boundary-scan testing?

Yes, the MC68EN360CRC25L implements a full IEEE 1149.1-compliant Test Access Port (TAP) with TRST, TCK, TMS, TDI, and TDO pins. Section 8 of the MC68360 User's Manual documents its boundary-scan architecture, including instruction register length, boundary-scan register structure, and supported instructions (SAMPLE/PRELOAD, EXTEST, INTEST). This enables PCB-level interconnect testing and in-system programming verification - a key requirement for high-reliability industrial assemblies using MC68EN360CRC25L.

How does the CPM in the MC68EN360CRC25L differ from the CPU32+ core?

The CPM in the MC68EN360CRC25L is a dedicated RISC microengine executing microcode from internal RAM, completely independent of the CPU32+ core. While CPU32+ handles application logic and OS services, the CPM autonomously manages serial protocol framing, CRC generation, and DMA transfers - confirmed in Sections 6 (SIM60) and 7 (CPM) of the MC68360 User's Manual. This separation allows MC68EN360CRC25L to sustain four concurrent HDLC links at 2 Mbps each without CPU intervention, delivering deterministic latency unattainable with software-only protocol stacks.

Can the MC68EN360CRC25L operate with an external clock instead of a crystal?

Yes, the MC68EN360CRC25L supports external clock input via the EXTAL pin, bypassing the internal oscillator circuit. Section 2.1.10.2 of the MC68360 User's Manual explicitly states that "a TTL-level clock may be applied to EXTAL," with XTAL left unconnected. This mode is used when system-level clock distribution requires synchronization to a common reference or when crystal startup delay must be eliminated - a documented capability of MC68EN360CRC25L in master-slave clock architectures.

Is the MC68EN360CRC25L pin-compatible with other MC68360 variants?

MC68EN360CRC25L shares the same 244-pin PGA footprint and signal mapping as MC68360RC25L and MC68360GC25L, as verified in Section 11 (Mechanical Data) of the MC68360 User's Manual. All three variants use identical pinout, power sequencing, and reset timing - enabling direct PCB substitution where temperature grade or ordering code permits. However, MC68EN360CRC25L is not pin-compatible with PQFP-packaged MC68360 derivatives due to differing package geometry and ball/pin assignments.