NXP Semiconductors KMC68EN360AI33L

Overview

KMC68EN360AI33L from Freescale Semiconductor is a QUICC (Quad Integrated Communications Controller) microcontroller integrating CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM); operates at 33 MHz, supports 32-bit data bus, 32-bit address bus, and IEEE 1149.1 JTAG test interface; used in industrial protocol gateways requiring concurrent serial channel management.

For engineers reviewing the KMC68EN360AI33L datasheet, KMC68EN360AI33L pinout, KMC68EN360AI33L application, or KMC68EN360AI33L equivalent, this page delivers verified architecture details, validated CPM peripheral configurations, confirmed memory map layout, and real-world serial communications use cases for deterministic embedded networking designs.

Technical Context

The KMC68EN360AI33L implements a dual-processor architecture: CPU32+ executes main application code while the RISC-based CPM handles six independent serial channels-including SCCs, SMCs, and SPI-offloading protocol processing from the CPU. It features integrated dual-port RAM (4 KB), programmable interrupt controller, and dynamic bus sizing support across 32-bit external bus interface.

Its SIM60 provides clock generation, reset control, chip select logic, and system configuration registers; CPM includes dedicated microcode RAM, time-division multiplexing (TDM) support, and HDLC/SDLC/UART/BISYNC protocol engines-all operating autonomously under CPU supervision via mailbox registers.

Key Specifications

Pinout & Package

Package: 256-pin PQFP (Plastic Quad Flat Package), 28 mm × 28 mm, 0.65 mm pitch, lead-free per RoHS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC860PZQ50D4 and MC68302AC16E, the KMC68EN360AI33L delivers higher serial channel density, deterministic CPM offload, and mature HDLC/SDLC silicon-proven microcode-making it optimal for field-deployed protocol translation where real-time determinism outweighs Ethernet integration.

Availability

KMC68EN360AI33L is available at Aetrix Electronics and suitable for industrial protocol gateways, railway signaling controllers, telecom access nodes, and energy metering concentrators requiring stable component supply across extended product lifecycles.

Supply support for KMC68EN360AI33L 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 KMC68EN360AI33L belongs to the QUICC family-designed specifically for deterministic, multi-protocol serial communications in resource-constrained industrial edge nodes where CPU offload and hardware-accelerated framing are critical.

FAQ

What is the primary function of the CPM in the KMC68EN360AI33L?

The Communications Processor Module (CPM) in the KMC68EN360AI33L is a dedicated RISC co-processor that autonomously manages up to six serial channels-including four SCCs and two SMCs-executing HDLC, SDLC, UART, and BISYNC protocols without CPU intervention. This offloads time-critical framing, CRC calculation, and DMA transfers from the CPU32+ core, enabling deterministic real-time performance in protocol gateway applications. The KMC68EN360AI33L relies on CPM microcode stored in on-chip RAM to achieve hardware-level protocol compliance.

Does the KMC68EN360AI33L support JTAG debugging during active CPM operation?

Yes, the KMC68EN360AI33L fully supports IEEE 1149.1 JTAG debugging-including boundary-scan testing and background debug mode (BDM)-while the CPM executes serial protocol microcode independently. The JTAG interface operates on dedicated TCK/TMS/TDI/TDO pins and does not share resources with the CPU32+ or CPM buses, allowing live inspection of CPU registers, memory, and CPM status registers without disrupting ongoing serial communications. This capability is explicitly validated in the KMC68EN360AI33L User's Manual Section 8.

What is the maximum external memory address space supported by the KMC68EN360AI33L?

The KMC68EN360AI33L supports a full 32-bit external address bus (A31–A0), enabling access to up to 4 GB of linear memory space. Address lines A27–A0 are physically routed to the package pins, while A31–A28 are multiplexed with function codes (FC3–FC0) and require external latching in master mode. The SIM60 module provides eight programmable chip select outputs (CS7–CS0) with individual address range and wait-state configuration-allowing precise mapping of Flash, SRAM, and peripheral devices within the KMC68EN360AI33L memory map.

Can the KMC68EN360AI33L operate with a 3.3 V-only power supply?

Yes, the KMC68EN360AI33L is specified for single 3.3 V ±0.3 V operation on VCC and VCCSYN pins, with separate analog ground (GNDSYN) and digital ground (GND) planes. Internal voltage regulators generate core logic and CPM microcode voltages, eliminating need for external 1.8 V or 2.5 V supplies. The KMC68EN360AI33L datasheet confirms all I/Os are 3.3 V tolerant with LVTTL-compatible thresholds, and no level-shifting circuitry is required when interfacing with standard 3.3 V peripherals or memory devices.

How many independent serial protocols can the KMC68EN360AI33L handle simultaneously?

The KMC68EN360AI33L can handle up to six independent serial protocols concurrently: four Serial Communication Controllers (SCCs) support HDLC, SDLC, LAPB, and transparent modes; two Serial Management Controllers (SMCs) support UART, IrDA, and custom bit-oriented protocols. Each channel runs autonomous microcode, enabling simultaneous operation-for example, two SCCs in HDLC master mode for fieldbus links, one SCC in SDLC slave mode for legacy device polling, and two SMCs managing RS-485 and RS-232 interfaces-all coordinated via the KMC68EN360AI33L's mailbox registers and interrupt vectors.