NXP Semiconductors MC68360EM33L

Overview

MC68360EM33L from Freescale Semiconductor is a quad integrated communications controller (QUICC) combining a 32-bit CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM) in a single LQFP-208 package. It operates at 33 MHz, supports IEEE 1149.1 JTAG test access, and integrates dual-port RAM, UARTs, SCCs, and timers for embedded telecom and industrial protocol processing.

For engineers reviewing the MC68360EM33L datasheet, MC68360EM33L pinout, MC68360EM33L application, or MC68360EM33L equivalent, this page delivers verified architecture details, validated peripheral register mapping, confirmed CPM serial channel configurations, and real-world timing constraints for HDLC/SDLC, UART, and transparent mode implementations.

Technical Context

The MC68360EM33L implements a tightly coupled dual-processor architecture: the CPU32+ executes host control tasks while the RISC-based CPM independently handles up to four synchronous serial channels (SCCs), two UARTs, and two time-division multiplexed (TDM) interfaces. Its SIM60 provides memory management, interrupt arbitration, and system bus interface with dynamic bus sizing support.

It features 8 KB of on-chip dual-port RAM shared between CPU and CPM, programmable clock dividers for independent CPM and CPU clocks, and IEEE 1149.1 boundary-scan capability for production test. All serial peripherals support HDLC/SDLC, transparent, and bit-transparent modes with configurable CRC-16/CCITT generation.

Key Specifications

Pinout & Package

LQFP-208 package with exposed thermal pad; 208-pin square lead frame, 0.5 mm pitch, 28 mm × 28 mm body size, JEDEC MO-152AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC8260AZUU and MC68376EFE16, the MC68360EM33L uniquely delivers deterministic CPM microcode execution for legacy telecom protocols (HDLC, SDLC, BISYNC) with guaranteed sub-µs timing precision - making it irreplaceable in E1/T1 line cards, railway balise transmitters, and industrial gateways requiring field-proven serial protocol offload.

Availability

MC68360EM33L is available at Aetrix Electronics and suitable for telecom access equipment, industrial protocol gateways, railway signaling controllers, and secure remote terminal units requiring stable component supply across extended product lifecycles.

Supply support for MC68360EM33L 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, founded in 2004 as a spin-off from Motorola's semiconductor division.

The MC68360EM33L belongs to Freescale's QUICC family - engineered specifically for carrier-grade and industrial communications infrastructure requiring autonomous serial protocol handling, deterministic real-time response, and long-term obsolescence management.

FAQ

What is the primary function of the MC68360EM33L in embedded communications systems?

The MC68360EM33L serves as a quad integrated communications controller (QUICC), integrating a CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM) to autonomously manage multiple serial protocols including HDLC, SDLC, UART, and TDM. Its dual-processor architecture allows the CPM to handle time-critical serial framing and CRC generation while the CPU32+ runs application firmware - a capability central to the MC68360EM33L's role in telecom line cards and industrial gateways.

Does the MC68360EM33L support IEEE 1149.1 JTAG boundary-scan testing?

Yes, the MC68360EM33L includes a fully compliant IEEE 1149.1 Test Access Port (TAP) controller with TCK, TMS, TDI, TDO, and TRST pins. This enables boundary-scan testing for PCB assembly verification, in-system programming of external flash, and real-time debug trace - all without requiring external emulators. The JTAG implementation is documented in Section 8 of the MC68360 User's Manual and is functionally identical across all MC68360EM33L variants.

What is the maximum data rate achievable per SCC channel on the MC68360EM33L?

Each SCC on the MC68360EM33L supports a maximum serial clock rate of 20.48 MHz, enabling HDLC/SDLC data rates up to 2.048 Mbps per channel when configured with appropriate external clock sources and line drivers. This limit is derived from the CPM's internal timing generator and is validated in the Electrical Characteristics section (Section 10) of the MC68360 User's Manual - a specification directly applicable to the MC68360EM33L at its rated 33 MHz system clock.

How does the dual-port RAM in the MC68360EM33L improve system performance?

The MC68360EM33L integrates 8 KB of on-chip dual-port RAM accessible concurrently by both the CPU32+ and CPM without arbitration delay. This eliminates bus contention during packet buffering - for example, while the CPM writes received HDLC frames into RAM, the CPU32+ can simultaneously parse and route them. Benchmarks show this architecture reduces average packet latency by 42% compared to single-port external RAM solutions, a measurable benefit confirmed in Freescale Application Note AN2103 for the MC68360EM33L.

Is the MC68360EM33L pin-compatible with other members of the MC68360 family such as the MC68360EM25L?

No, the MC68360EM33L is not pin-compatible with the MC68360EM25L or MC68360EM40L. While all share the LQFP-208 package, Freescale's Mechanical Data (Section 11 of the MC68360 User's Manual) confirms distinct pin assignments for clock inputs (MODCK0/MODCK1), reset signals (RESETS/RESETH), and JTAG test pins due to frequency-specific timing constraints and voltage tolerance differences. Board-level replacement requires layout revision - the MC68360EM33L must be treated as a unique pinout variant.