NXP Semiconductors MC68LK332GCEH16

Overview

MC68LK332GCEH16 from Freescale Semiconductor (formerly Motorola) is a 32-bit modular microcontroller featuring CPU32 core, System Integration Module (SIM), Time Processor Unit (TPU), Queued Serial Module (QSM), and 2-Kbyte TPURAM. It operates at 16 MHz with −40°C to +85°C temperature range, uses 132-pin PQFP package, and targets motion control and industrial embedded systems requiring deterministic real-time timing.

For engineers reviewing the MC68LK332GCEH16 datasheet, MC68LK332GCEH16 pinout, MC68LK332GCEH16 application, or MC68LK332GCEH16 equivalent, this page delivers verified technical identity, validated pin functions, confirmed TPU channel count (16), QSM dual-submodule support (SCI + QSPI), and exact SIM register map alignment - all critical for legacy system maintenance, BOM continuity, and drop-in replacement validation.

Technical Context

The MC68LK332GCEH16 implements a fully static CPU32 core with virtual memory support and background debugging mode, enabling zero-wait-state operation across clock rate changes. Its intermodule bus (IMB) connects standardized modules including SIM (with PLL clock synthesizer and watchdog), TPU (independent 16-channel microengine), and QSM (dual SCI/QSPI serial interface).

System clocking supports external crystal (XTAL/EXTAL) or oscillator input, with programmable PLL generating up to 20.97 MHz; the 16 MHz variant uses fixed-frequency configuration. Power management includes LPSTOP command and VSTBY-supplied standby RAM, preserving TPURAM contents during low-power states.

Key Specifications

Pinout & Package

MC68LK332GCEH16 is housed in a 132-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch and 20.0 × 20.0 mm body size. Pin functions follow the MC68332G family specification, with dedicated TPU channel pins (TPUCH0–TPUCH15), dual-function ports (PE, PF, PC, PQS), and IMB-aligned address/data/control signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit real-time microcontroller applications.

Compared with MC68LK332GCEH16, MC68332GCFC16 offers identical functionality with standard naming, while MC68332GVFC16 extends thermal range without altering timing behavior - both preserve TPU determinism and QSM dual-submodule operation required for motion control.

Availability

MC68LK332GCEH16 is available at Aetrix Electronics and suitable for industrial motion control, automated test equipment, power electronics gate drivers, and legacy PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for MC68LK332GCEH16 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) pioneered high-integration microcontrollers for real-time industrial control, emphasizing modularity, deterministic timing, and debuggability.

The MC68332 family - including MC68LK332GCEH16 - was designed specifically for motion control and embedded automation applications demanding hardware-accelerated timing, robust serial interfacing, and field-upgradable firmware.

FAQ

What is the CPU architecture used in the MC68LK332GCEH16?

The MC68LK332GCEH16 integrates the CPU32 - a 32-bit CISC core with virtual memory support, table-lookup/interpolate instruction, and full static operation. It executes instructions at 16 MHz with deterministic timing, enabling reliable real-time control without clock gating side effects. The CPU32 instruction set includes background debugging mode support, which is fully operational in the MC68LK332GCEH16.

Does the MC68LK332GCEH16 support external memory expansion?

Yes, the MC68LK332GCEH16 supports external memory expansion via its 24-bit address bus (ADDR[23:0]), 16-bit data bus (DATA[15:0]), and dedicated control signals including AS, R/W, DS, and eleven programmable chip-select outputs (CS[10:0]). The SIM's external bus interface provides configurable wait-state generation and dynamic bus sizing through DSACK0/DSACK1, making it compatible with SRAM, Flash, and peripheral ICs.

How many TPU channels does the MC68LK332GCEH16 have, and what functions do they support?

The MC68LK332GCEH16 features 16 independent TPU channels (TPUCH0–TPUCH15), each capable of performing any supported time function - including input capture, output compare, PWM generation, quadrature decoding, and pulse-width measurement. These channels operate autonomously from the CPU32, ensuring jitter-free timing critical for motor control and encoder interfacing in the MC68LK332GCEH16.

What serial communication interfaces are integrated into the MC68LK332GCEH16?

The MC68LK332GCEH16 integrates the Queued Serial Module (QSM), which combines two independent submodules: an enhanced Serial Communication Interface (SCI) for asynchronous UART-style communication and a Queued Serial Peripheral Interface (QSPI) supporting master/slave SPI with four peripheral chip selects (PCS0–PCS3). Both operate concurrently using shared PQS0–PQS7 pins, with hardware queuing eliminating CPU polling overhead in the MC68LK332GCEH16.

Is the MC68LK332GCEH16 pin-compatible with other MC68332 variants?

Yes, the MC68LK332GCEH16 is pin-compatible with all MC68332G-series devices in the 132-pin PQFP package, including MC68332GCFC16 and MC68332GVFC16. Pin assignments for TPU channels, QSM ports, address/data buses, and control signals match exactly per Figures 2 and 7 of the MC68332TS/D datasheet, enabling direct substitution without PCB modification in the MC68LK332GCEH16 design context.