NXP Semiconductors MC68360EM25VL

Overview

MC68360EM25VL from Freescale Semiconductor is a quad integrated communications controller (QUICC) combining a CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM) in a single 256-pin PQFP package. It operates at 25 MHz, supports IEEE 1149.1 JTAG test access, and integrates dual-port RAM for concurrent CPU/CPM access - enabling real-time protocol handling in industrial router and telecom access node applications.

For engineers reviewing the MC68360EM25VL datasheet, MC68360EM25VL pinout, MC68360EM25VL application, or MC68360EM25VL equivalent, key selection considerations include its 25 MHz clock rating, 256-pin PQFP mechanical footprint, CPM-based serial channel offload capability, and CPU32+ instruction set compatibility with the M68000 family.

Technical Context

The MC68360EM25VL implements a tightly coupled dual-processor architecture: the CPU32+ core handles general-purpose tasks and system control, while the independent CPM executes time-critical communication protocols (HDLC, UART, BISYNC, SDLC) without CPU intervention. Its SIM60 provides memory management, interrupt control, chip select logic, and bus arbitration.

It features 8 KB of on-chip dual-port RAM shared between CPU and CPM, programmable PLL-based clock generation, and full IEEE 1149.1 boundary-scan support. The device supports dynamic bus sizing, misaligned operand access, and synchronous/asynchronous bus cycles compliant with M68000-family timing.

Key Specifications

Pinout & Package

MC68360EM25VL is housed in a 256-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch and 28 × 28 mm body size. Pin numbering follows standard counter-clockwise convention starting from top-left corner (Pin 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68360RC25VL, the MC68360EM25VL offers extended temperature operation critical for outdoor infrastructure; compared with MPC860TBCZQ50D, it delivers proven CPM microcode efficiency for pure serial protocol stacks without Ethernet overhead or PowerPC toolchain migration.

Availability

MC68360EM25VL is available at Aetrix Electronics and suitable for industrial router design, telecom access node development, and railway signaling controller production requiring stable component supply across long product lifecycles.

Supply support for MC68360EM25VL 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 MC68360EM25VL belongs to the QUICC family - engineered specifically for deterministic, multi-protocol serial communications in resource-constrained edge devices where CPU offload and real-time channel handling are essential.

FAQ

What is the maximum operating frequency of the MC68360EM25VL?

The MC68360EM25VL is rated for a maximum clock frequency of 25 MHz, as specified in its electrical characteristics and ordering information. This frequency applies to both the CPU32+ core and the CPM subsystem under extended temperature conditions (–40°C to +85°C). Operation above 25 MHz is not guaranteed and may result in timing violations or undefined behavior. The device uses an internal PLL to derive system clocks from the external crystal, and CLKO1 output reflects this 25 MHz rate.

Does the MC68360EM25VL support JTAG debugging?

Yes, the MC68360EM25VL fully supports IEEE 1149.1 JTAG boundary-scan through dedicated pins (TCK, TMS, TDI, TDO, TRST). This enables in-circuit emulation, flash programming, and production test without requiring additional debug interfaces. The JTAG TAP controller is integrated into the SIM60 module and is accessible regardless of CPU32+ or CPM operational state - allowing debug access even when the CPU is halted or the CPM is actively processing serial frames.

How does the CPM in the MC68360EM25VL differ from a standard UART peripheral?

Unlike a basic UART, the CPM in the MC68360EM25VL is a dedicated RISC-based communications co-processor with its own instruction ROM, dual-port RAM, and four independent serial channels (SCC/SMC). It executes microcode for HDLC, BISYNC, SDLC, and UART protocols autonomously - handling CRC generation, bit stuffing, frame alignment, and DMA-like buffer management without CPU intervention. This offloads ~70% of serial protocol processing from the CPU32+, enabling deterministic real-time performance unattainable with software-driven UART drivers.

What package type is used for the MC68360EM25VL?

The MC68360EM25VL is packaged in a 256-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch and 28 mm × 28 mm body dimensions. This package is RoHS-compliant and designed for standard surface-mount assembly processes. Pin 1 is located at the top-left corner, and the device uses a counter-clockwise pin numbering scheme. The PQFP footprint is documented in Section 11 (Ordering Information and Mechanical Data) of the MC68360 User's Manual.

Can the MC68360EM25VL replace the MC68302 in existing designs?

The MC68360EM25VL is architecturally positioned as an upgrade path from the MC68302, offering enhanced CPM capabilities, larger dual-port RAM (8 KB vs. 2 KB), and CPU32+ core improvements. However, it is not pin-compatible - the MC68302 uses a 132-pin QFP while the MC68360EM25VL uses 256-pin PQFP. Migration requires PCB redesign, though software can leverage M68000-family compatibility and CPM microcode reuse. Freescale explicitly documents hardware compatibility issues and software adaptation steps in Section 1.3 of the MC68360 User's Manual.