NXP Semiconductors KMC68MH360AI33L

Overview

KMC68MH360AI33L from Freescale Semiconductor is a 32-bit integrated microcontroller and communications processor combining CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM). It delivers 4.5 MIPS at 25 MHz, supports up to 32-bit data bus with dynamic sizing, and integrates four SCCs, two SMCs, one SPI, four general-purpose timers, two IDMA controllers, and dual TDM time-slot assigner - enabling embedded telecom gateway and industrial protocol bridge applications.

For engineers reviewing the KMC68MH360AI33L datasheet, KMC68MH360AI33L pinout, KMC68MH360AI33L application, or KMC68MH360AI33L equivalent, this page provides verified technical context, validated pin functions, real-world use cases in HDLC/TDM/Ethernet systems, and confirmed alternative parts for migration or second-sourcing decisions.

Technical Context

The KMC68MH360AI33L implements a tightly coupled dual-module architecture: the CPU32+ core handles general-purpose execution while the RISC-based CPM offloads serial protocol processing (HDLC, UART, SPI, transparent bit-stream) using 224 buffer descriptors and dedicated microcode support. Its SIM60 provides system-level services including clock synthesis, periodic interrupt timer, software watchdog, IEEE 1149.1 JTAG test access, and bus arbitration.

It supports slave mode operation for MC68040 companion configurations, enabling external master control of the CPM and memory subsystems. The device features dynamic bus sizing (8/16/32-bit), boot chip select options, DRAM controller with CAS/WE/OE support, and spurious interrupt monitoring - all verified for industrial temperature range (–40°C to +85°C) and 25 MHz max operation.

Key Specifications

Pinout & Package

KMC68MH360AI33L is housed in a 240-pin PQFP package with 20-mil pitch, designed for surface-mount assembly and industrial thermal cycling. Pin functions are validated per Freescale MC68360RC25/EM25 documentation and match the standard QUICC pinout layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KMC68MH360AI33L, MC68EN360RC25 offers integrated Ethernet PHY but sacrifices pin compatibility and increases layout complexity, while MPC8260AZUUDBA delivers higher compute performance and security features but abandons CPM-based protocol offload - making it unsuitable for legacy HDLC/TDM migration without full firmware rewrite.

Availability

KMC68MH360AI33L is available at Aetrix Electronics and suitable for industrial protocol gateways, telecom access nodes, and embedded network bridges requiring stable component supply, long-term lifecycle assurance, and verified industrial temperature operation.

Supply support for KMC68MH360AI33L 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) is a fabless semiconductor company specializing in embedded processing, connectivity, and analog solutions for automotive, industrial, and networking markets.

KMC68MH360AI33L belongs to the QUICC™ family - designed specifically for intelligent communications control in resource-constrained embedded systems requiring hardware-accelerated serial protocol handling and deterministic real-time response.

FAQ

What is the maximum operating frequency of the KMC68MH360AI33L?

The KMC68MH360AI33L is rated for operation up to 25 MHz, as confirmed in Freescale's MC68360 Package/Frequency Availability table and validated across industrial temperature range (–40°C to +85°C). This frequency enables 4.5 MIPS performance from the CPU32+ core while maintaining full CPM and SIM60 functionality - critical for real-time HDLC frame processing and TDM slot assignment in telecom edge devices. Exceeding 25 MHz violates datasheet specifications and may cause timing violations in buffer descriptor chains or DRAM controller sequences.

Does the KMC68MH360AI33L include an integrated Ethernet MAC?

Yes, the KMC68MH360AI33L includes an integrated Ethernet MAC layer on SCC1, supporting full 10-Mbps IEEE 802.3 operation - as documented in the "QUICC Key Features" section under "Four SCCs". However, it does not integrate a PHY; external transceivers (e.g., DP83840) are required for physical layer signaling. This differs from MC68EN360 variants which add PHY logic. The KMC68MH360AI33L's SCC1 must be configured with appropriate parameter RAM and microcode to enable Ethernet framing, CRC generation, and backoff logic.

How many serial communication channels does the KMC68MH360AI33L support?

The KMC68MH360AI33L supports seven serial communication channels: four Serial Communication Controllers (SCCs), two Serial Management Controllers (SMCs), and one Serial Peripheral Interface (SPI). Each SCC supports multiple protocols including HDLC/SDLC, UART, BISYNC, and AppleTalk; both SMCs support UART and transparent modes plus GCI for TDM interfacing; the SPI supports master/slave/multimaster operation. This configuration is fixed per the QUICC architecture and verified in the MC68360 block diagram and serial configuration examples.

Is the KMC68MH360AI33L pin-compatible with the MC68302?

No, the KMC68MH360AI33L is not pin-compatible with the MC68302. As explicitly stated in the "Hardware Compatibility Issues" section, the QUICC has a 240-pin package versus the MC68302's 132-pin footprint, and the pinout is entirely different - including distinct signal naming, bus sizing logic, and CPM-specific control lines. Migration from MC68302 requires PCB redesign, though software porting benefits from CPU32+ instruction set compatibility and retained CPM buffer descriptor structure.

What memory interface options does the KMC68MH360AI33L support?

The KMC68MH360AI33L supports dynamic bus sizing for 8-bit, 16-bit, and 32-bit memory interfaces, with four CAS lines, four WE lines, and one OE line - enabling direct connection to SRAM, EPROM, Flash EPROM, and DRAM. Boot memory selection is configurable via chip select CS0 for 8/16/32-bit width at reset. The integrated DRAM controller supports RAS/CAS multiplexing and optional parity, allowing glueless integration of standard SIMMs without external address latches or bus buffers - as demonstrated in Figure 2 of the product brief.