NXP Semiconductors MC68332GCAG20

Overview

MC68332GCAG20 from Freescale Semiconductor (originally Motorola) is a 32-bit modular microcontroller featuring the CPU32 core, System Integration Module (SIM), Time Processor Unit (TPU), Queued Serial Module (QSM), and 2-Kbyte TPURAM. It operates at up to 20 MHz system clock speed, supports –40°C to +85°C industrial temperature range, and integrates 16 TPU channels for deterministic real-time timing control. It is used in motion control systems requiring precise PWM generation and encoder interface.

For engineers reviewing the MC68332GCAG20 datasheet, MC68332GCAG20 pinout, MC68332GCAG20 application, or MC68332GCAG20 equivalent, this page delivers verified technical context, validated pin functions, confirmed packaging (132-pin PQFP), and two rigorously cross-checked alternative parts - all derived from official Freescale documentation and ordering data.

Technical Context

The MC68332GCAG20 implements a modular architecture with an intermodule bus (IMB) linking CPU32, SIM, TPU, QSM, and TPURAM. Its PLL-based clock synthesizer accepts 32.768 kHz crystal input and generates up to 20.97 MHz internal clock, with full static operation enabling dynamic frequency scaling without register corruption.

Its TPU executes time-critical tasks independently of the CPU32 via 16 programmable channels, each supporting input capture, output compare, pulse-width modulation, and quadrature decoding. The QSM combines SCI and QSPI submodules on shared PQS[7:0] pins, while the SIM provides 11 chip-selects, watchdog timers, and dual 8-bit I/O ports (PF/PE) plus one 7-bit port (PC).

Key Specifications

Pinout & Package

MC68332GCAG20 uses a 132-pin PQFP package (JEDEC MS-026AC). Pin functions are defined per Freescale MC68332TS/D Rev. 2, Figure 2. All pins support CMOS logic levels; discrete I/O functions are mapped to ports PF, PE, PC, and PQS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68332ACFC20 and MC68376GVM20, the MC68332GCAG20 offers optimal cost-performance balance for single-axis motion control and fixed-function embedded controllers where PPWA or CAN are unnecessary - preserving legacy code compatibility and minimizing BOM complexity.

Availability

MC68332GCAG20 is available at Aetrix Electronics and suitable for industrial motion control, motor drive interface, and factory automation PLC applications requiring stable component supply across extended product lifecycles.

Supply support for MC68332GCAG20 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) developed high-reliability microcontrollers for industrial and automotive applications, emphasizing real-time determinism and long-term supply stability.

The MC68332GCAG20 belongs to the 68300 family of modular microcontrollers designed specifically for deterministic motion control and embedded automation - prioritizing TPU offload, static clocking, and industrial temperature resilience.

FAQ

What is the maximum operating frequency of the MC68332GCAG20?

The MC68332GCAG20 is rated for a maximum system clock frequency of 20 MHz. This is achieved using the on-chip PLL clock synthesizer, which can generate the 20 MHz internal clock from a 32.768 kHz crystal reference. The device maintains full functionality and timing specification compliance at this speed across its –40°C to +85°C operating temperature range.

Does the MC68332GCAG20 include on-chip RAM, and how is it used?

Yes, the MC68332GCAG20 integrates 2 Kbytes of on-chip static RAM (TPURAM). This memory is dual-purpose: it can be configured as general-purpose SRAM for CPU32 data/stack usage, or as TPU microcode emulation RAM to store custom TPU microprograms. Configuration is controlled via the TPURAM control register block at $YFFB00–$YFFB3F.

How many TPU channels does the MC68332GCAG20 support, and what functions do they perform?

The MC68332GCAG20 supports 16 independent TPU channels (TPUCH[15:0]). Each channel can execute any time-based function - including input capture, output compare, PWM generation, quadrature decoding, and pulse accumulation - without CPU intervention. This enables deterministic, jitter-free timing control critical for motor commutation and encoder interfacing.

What package type is used for the MC68332GCAG20, and what are its key mechanical features?

The MC68332GCAG20 uses a 132-pin Plastic Quad Flat Package (PQFP) conforming to JEDEC MS-026AC. It has a 20 mm × 20 mm body size, 0.65 mm lead pitch, and gull-wing leads. This package supports standard surface-mount assembly processes and provides sufficient I/O density for industrial control applications requiring parallel bus interfacing and multiple peripheral signals.

Is the MC68332GCAG20 pin-compatible with other members of the 68332 family?

Yes, the MC68332GCAG20 shares identical pinout and electrical characteristics with other 132-pin PQFP variants in the MC68332 family (e.g., MC68332CFC20, MC68332VFC20), differing only in temperature grade and TPU variant designation. This allows direct PCB reuse across industrial, extended, and automotive temperature versions when layout accommodates thermal and voltage margin requirements.