NXP Semiconductors MC68331CPV16

Overview

MC68331CPV16 from Freescale Semiconductor is a 32-bit modular microcontroller integrating CPU32 core, System Integration Module (SIM), General-Purpose Timer (GPT), and Queued Serial Module (QSM). It operates at 16 MHz system clock, supports −40°C to +125°C industrial temperature range, and features fully static operation with low-power stop (LPSTOP) capability. Used in motor control and industrial automation systems requiring deterministic real-time response and integrated peripheral management.

For engineers reviewing the MC68331CPV16 datasheet, MC68331CPV16 pinout, MC68331CPV16 application, or MC68331CPV16 equivalent, this page delivers verified technical context, validated pin functions, confirmed timing specifications, and real-world use cases for embedded control design, legacy system maintenance, and automotive-grade ECU retrofitting.

Technical Context

The MC68331CPV16 implements a modular architecture using a standardized intermodule bus (IMB) with 24 address and 16 data lines, enabling deterministic communication between CPU32, SIM, GPT, and QSM. Its SIM provides programmable chip-selects (CS[10:0]), external bus interface, watchdog timer, clock monitor, and periodic interrupt generator.

GPT includes two 16-bit free-running counters, three input capture channels, four output compare channels, and two PWM outputs; QSM integrates dual-function SCI (UART) and QSPI with 80-byte RAM and up to 16 automatic transfers - all accessible via shared PQFP-144 I/O pins including PQS[7:0], PGP[7:0], PF[7:0], PE[7:0], and PC[6:0].

Key Specifications

Pinout & Package

MC68331CPV16 uses a 144-pin Plastic Quad Flat Package (PQFP) with 0.5 mm pitch, JEDEC MS-026AC compliant footprint, and thermal pad not electrically connected. Pin assignments follow Freescale's MC68331 144-Pin QFP layout (Figure 3, MC68331TS/D Rev. 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68331CPV16, MC68332CAG16 offers expanded on-chip memory but demands mechanical redesign, while MPC5604B delivers modern automotive interfaces at the cost of software rearchitecture - neither is pin-compatible, making MC68331CPV16 irreplaceable in maintained legacy systems without board revision.

Availability

MC68331CPV16 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, automotive ECU retrofits, and energy metering gateways requiring stable component supply across extended product lifecycles.

Supply support for MC68331CPV16 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) specialized in high-reliability microcontrollers for automotive, industrial, and aerospace applications before its 2015 acquisition.

The MC68331 product line was designed for deterministic real-time control in harsh environments, emphasizing modular integration, hardware fault tolerance, and long-term manufacturability - aligning with industrial automation and legacy automotive ECU requirements.

FAQ

What is the maximum operating frequency of the MC68331CPV16?

The MC68331CPV16 is rated for a maximum system clock frequency of 16 MHz, as specified in Freescale's MC68331TS/D Rev. 2 datasheet Table 1. This frequency is achieved using an internal PLL locked to a 32.768 kHz crystal reference or an external clock source. Operation above 16 MHz is not guaranteed and may violate timing margins for SIM, GPT, and QSM modules.

Does the MC68331CPV16 support in-circuit debugging?

Yes, the MC68331CPV16 supports background debugging via dedicated DSI (Data Serial In), DSO (Data Serial Out), and DSCLK (Debug Serial Clock) pins. These signals enable non-intrusive firmware inspection and breakpoint triggering without halting real-time peripheral operation - a capability confirmed in Section 4.7 of the MC68331TS/D technical summary.

What package type and pin count does the MC68331CPV16 use?

The MC68331CPV16 uses a 144-pin Plastic Quad Flat Package (PQFP) with 0.5 mm lead pitch, as documented in Figure 3 of the MC68331TS/D Rev. 2 datasheet. The "V" in the part number denotes the 144-pin variant, distinguishing it from the 132-pin PQFP version (e.g., MC68331CFC16).

Can the MC68331CPV16 operate without an external crystal?

Yes, the MC68331CPV16 can accept an external clock signal directly on the EXTAL pin, bypassing the internal crystal oscillator circuit. However, the XTAL pin must remain unconnected or terminated per Freescale's recommendations in Section 2.4 to prevent instability. The MODCLK pin selects clock source configuration.

What peripheral modules are integrated into the MC68331CPV16?

The MC68331CPV16 integrates four primary modules: CPU32 (32-bit core), System Integration Module (SIM) for bus control and protection, General-Purpose Timer (GPT) with input capture/output compare/PWM, and Queued Serial Module (QSM) combining SCI (UART) and QSPI functionality - all interconnected via the standardized intermodule bus (IMB).