NXP Semiconductors MC68LC302PU16CT

Overview

MC68LC302PU16CT from Freescale is a low-power, static-core integrated multiprotocol processor based on the M68000 architecture, operating at 16.67 MHz with 5 V supply, featuring dual SCCs, 1152-byte dual-port RAM, three timers (including watchdog and PIT), and 4 chip-select lines. It targets embedded communications and portable control systems requiring reduced pin count and lower power than the MC68302.

For engineers reviewing the MC68LC302PU16CT datasheet, MC68LC302PU16CT pinout, MC68LC302PU16CT application, or MC68LC302PU16CT equivalent, key selection criteria include static 68000 core operation, dual-SCC protocol support (HDLC/UART/BISYNC), 100-pin TQFP packaging, low-power standby modes with wake-up via PIT or two pins, and glueless memory interface using WEH/WEL/OE.

Technical Context

The MC68LC302PU16CT integrates a static M68000 CPU core with on-chip system integration block (SIB) and communications processor (CP). Its SIB provides interrupt control, PIO ports with interrupt capability, 1152-byte dual-port RAM, three timers (PIT, watchdog, general-purpose), and four programmable chip-selects with wait-state logic.

The CP contains a RISC main controller and two full-duplex SCCs supporting HDLC, UART, BISYNC, and transparent modes with autobaud. The device omits SCC3 and external bus arbitration signals (BR/BG/BGACK) versus MC68302, and replaces UDS/LDS/R/W with WEH/WEL/OE for simplified memory interfacing.

Key Specifications

Pinout & Package

MC68LC302PU16CT is housed in a 100-pin Thin Quad Flat Pack (TQFP) with 0.5 mm pitch, lead-free (RoHS-compliant), and thermal pad exposed on bottom for enhanced heat dissipation in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68302RC20 and MC68360VR66B, the MC68LC302PU16CT delivers optimized balance of dual-SCC functionality, static-core low-power operation, and compact 100-pin TQFP packaging-making it ideal for space- and energy-constrained embedded communications where third serial channel or Ethernet is unnecessary.

Availability

MC68LC302PU16CT is available at Aetrix Electronics and suitable for industrial serial gateways, PCMCIA modem cards, embedded telemetry units, and intelligent power meter interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC68LC302PU16CT 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) was a leading designer of embedded processors, analog and mixed-signal ICs, and connectivity solutions for automotive, industrial, and networking markets.

The MC68LC302PU16CT belongs to Freescale's Integrated Multiprotocol Processor (IMP) family, engineered specifically for cost-sensitive, low-power embedded communications applications requiring dual serial protocol engines and deterministic real-time control.

FAQ

What is the core architecture of the MC68LC302PU16CT?

The MC68LC302PU16CT features a static version of the M68000 16/32-bit CPU core, enabling full stop-clock operation and zero-power retention in standby mode. Unlike dynamic cores, it does not require continuous clocking to retain state, making it suitable for battery-backed or intermittent-power applications. This static implementation is confirmed in the Freescale product brief and distinguishes the MC68LC302PU16CT from its predecessor MC68302.

Does the MC68LC302PU16CT support external bus mastering?

No, the MC68LC302PU16CT does not support full external bus mastering due to omission of BR, BG, and BGACK pins present on the MC68302. External masters may assert HALT to pause the CPU, but cannot arbitrate for bus control. This limitation is explicitly documented in the "Differences Between the MC68LC302 and MC68302" section of the Freescale product information, confirming the MC68LC302PU16CT is intended primarily as a standalone or slave-mode controller.

What serial protocols does the MC68LC302PU16CT support?

The MC68LC302PU16CT supports HDLC/SDLC, UART, BISYNC, and transparent serial modes across its two SCCs, with autobaud capability on both channels. These protocols are directly specified in the "Features" section of the Freescale product brief. The device does not support SCC3-related protocols, as that controller is removed in the MC68LC302PU16CT relative to the MC68302.

How does the MC68LC302PU16CT achieve low-power operation?

The MC68LC302PU16CT achieves low-power operation through its static M68000 core, dedicated low-power (standby) modes, and wake-up capability via either the Periodic Interrupt Timer (PIT) or two configurable pins. The on-chip PLL supports 32 kHz crystal operation, reducing system-level power consumption. These capabilities are detailed in the "Applications" and "Features" sections of the official Freescale documentation for the MC68LC302PU16CT.

Is the MC68LC302PU16CT pin-compatible with the MC68302?

No, the MC68LC302PU16CT is not pin-compatible with the MC68302. It uses a 100-pin TQFP package versus the MC68302's 132-pin PGA, and key signals such as UDS/LDS/R/W are replaced by WEH/WEL/OE, while SCC3-related pins and bus arbitration lines are removed. Freescale explicitly states the pin reduction necessitated functional trade-offs, confirming the MC68LC302PU16CT requires a new PCB layout.