NXP Semiconductors MC68LC302PU16VCT

Overview

MC68LC302PU16VCT from Freescale is a low-cost integrated multiprotocol processor based on a static 68000 core, operating at 16.67 MHz with 5 V supply, housed in a 100-pin TQFP package. It integrates dual SCCs, three timers (including watchdog and PIT), 1152-byte dual-port RAM, four chip-select lines, and on-chip PLL supporting 32 kHz or 4 MHz crystals. It targets embedded communication controllers where full MC68302 functionality is unnecessary.

For engineers reviewing the MC68LC302PU16VCT datasheet, MC68LC302PU16VCT pinout, MC68LC302PU16VCT application, or MC68LC302PU16VCT equivalent, key selection criteria include dual-SCC support, static-core low-power operation, glueless memory interface via WEH/WEL/OE, 100-pin TQFP footprint, and absence of SCC3 and external bus arbitration signals.

Technical Context

The MC68LC302PU16VCT implements a static M68000 CPU core enabling zero-wait-state operation and deep low-power standby modes activated via HALT or DISCPU. Its System Integration Block (SIB) provides interrupt control with two operational modes, parallel I/O ports with interrupt capability, and programmable address mapping for dual-port RAM and IMP registers.

Its Communications Processor (CP) contains a RISC main controller and two independent full-duplex SCCs supporting HDLC/SDLC, UART, BISYNC, transparent modes, and autobaud detection. The on-chip PLL accepts 32 kHz or 4 MHz crystal inputs and generates system clocks; VCCSYN/GNDSYN/XFC pins are dedicated to PLL support.

Key Specifications

Pinout & Package

MC68LC302PU16VCT is supplied in a 100-pin Thin Quad Flat Pack (TQFP) with 0.5 mm lead pitch and 14 mm × 14 mm body size. Pin functions are defined per Freescale's MC68LC302 documentation, with critical signals including dual SCC I/O (RXD1–TXD2), PIT/WDG-capable GPIO (PB7, PB3, PB5, PB6), PLL support (XTAL, EXTAL, XFC, MODCLK, VCCSYN, GNDSYN), and memory interface controls (WEH, WEL, OE, AS, DTACK).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68302RC20 and MC68332CFM16, the MC68LC302PU16VCT uniquely balances dual-SCC protocol flexibility, static-core low-power operation, and compact TQFP packaging-making it optimal for space- and power-constrained communication edge nodes where SCC3 is unused.

Availability

MC68LC302PU16VCT is available at Aetrix Electronics and suitable for protocol translation gateways, low-power remote terminal units, PCMCIA communication cards, and intelligent peripheral controllers requiring stable component supply and long-term industrial availability.

Supply support for MC68LC302PU16VCT 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, microcontrollers, and analog chips for automotive, industrial, and networking applications.

The MC68LC302 product line delivers cost-optimized, low-power variants of the MC68302 IMP family-targeting portable, space-constrained, and battery-operated communication equipment needing dual-protocol serial connectivity.

FAQ

What is the core architecture of the MC68LC302PU16VCT?

The MC68LC302PU16VCT features a static 68000 CPU core, enabling zero-wait-state operation and full-clock-stop capability for ultra-low-power standby modes. Unlike dynamic cores, this static implementation eliminates refresh overhead and allows deterministic execution timing. The MC68LC302PU16VCT uses this core to deliver reliable performance in battery-powered and thermally constrained environments without sacrificing M68000 software compatibility.

Does the MC68LC302PU16VCT support all three serial communication controllers like the MC68302?

No, the MC68LC302PU16VCT omits SCC3 and its associated baud rate generator (BRG3), retaining only two full-duplex serial communication controllers (SCC1 and SCC2). This reduction enables the 100-pin TQFP package and lowers cost and power. The MC68LC302PU16VCT remains fully compatible with applications using only two serial protocols-such as simultaneous HDLC and UART-but cannot replace MC68302 designs requiring three independent serial links.

What clock sources does the MC68LC302PU16VCT support?

The MC68LC302PU16VCT supports two crystal-based clock inputs: a 32 kHz watch crystal for ultra-low-power timing and a 4 MHz crystal for full-speed operation, both fed into its on-chip PLL. Dedicated pins-XTAL, EXTAL, XFC, VCCSYN, and GNDSYN-enable clean PLL operation. The MC68LC302PU16VCT does not support external clock input or RC oscillators; crystal drive strength and load capacitance must match Freescale's specified values for stable lock.

How does the MC68LC302PU16VCT handle low-power operation?

The MC68LC302PU16VCT implements multiple low-power modes via HALT and DISCPU pins, reducing current draw to microamp levels. Wake-up can occur via the Periodic Interrupt Timer (PIT), two dedicated wake-up pins (PB3/PB5), or external interrupt. During stop mode, the static core halts while peripherals like PIT and SCCs remain clocked if needed. The MC68LC302PU16VCT leverages these features to extend battery life in portable telemetry and sensor applications without external wake-up circuitry.

What memory interface options does the MC68LC302PU16VCT provide?

The MC68LC302PU16VCT provides a glueless memory interface using WEH (high-byte write enable), WEL (low-byte write enable), and OE (output enable) signals-replacing the UDS/LDS/RW pins used on the MC68302. It supports 8-bit and 16-bit data buses, four programmable chip-select lines with wait-state logic, and direct connection to EPROM, SRAM, Flash, and EEPROM. The MC68LC302PU16VCT also includes 1152-byte on-chip dual-port RAM accessible concurrently by CPU and communications processor.