NXP Semiconductors MC68302CFC16C

Overview

MC68302CFC16C from Motorola is a 16 MHz clocked, 3.3 V/5 V tolerant integrated multiprotocol processor (IMP) in 132-pin CQFP package, featuring on-chip 32-bit CPU32 core, dual UART, timer system, and programmable I/O - used as main controller in industrial protocol gateways and legacy serial communication systems.

For engineers reviewing the MC68302CFC16C datasheet, MC68302CFC16C pinout, MC68302CFC16C application, or MC68302CFC16C equivalent, key selection criteria include IMP architecture compatibility, 16-bit external bus interface timing, UART register mapping, watchdog timer configuration, and CQFP thermal and routing constraints.

Technical Context

The MC68302CFC16C implements the CPU32 instruction set with 32-bit internal data path and 24-bit address bus, supporting both big-endian memory organization and synchronous/asynchronous peripheral interfacing. It integrates a 16-bit time processor unit (TPU) with eight independent channels and a 16-bit system integration module (SIM) for interrupt control and chip select generation.

Its IMP architecture unifies communications processing via two MC68681-compatible DUARTs, each with FIFO buffering and RS-232/RS-422 signal-level support through external transceivers. The device operates with a single 16 MHz crystal input and requires no external PLL circuitry for core clock derivation.

Key Specifications

Availability

MC68302CFC16C is available at Aetrix Electronics and suitable for industrial protocol gateways, legacy serial terminal controllers, embedded telemetry systems, and factory automation HMI interfaces requiring stable component supply across long-lifecycle deployments.

Supply support for MC68302CFC16C 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

Motorola Semiconductor (now part of NXP Semiconductors) was a pioneer in 68K-family microprocessors and communications ICs, delivering high-reliability embedded controllers for industrial and telecom infrastructure.

The MC68302CFC16C belongs to the MC68302 Integrated Multiprotocol Processor family, designed specifically for deterministic serial protocol handling - including HDLC, SDLC, and asynchronous framing - in resource-constrained edge nodes.

FAQ

What is the maximum operating temperature range for the MC68302CFC16C?

The MC68302CFC16C is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per Motorola's original characterization and applies to the 132-pin CQFP package under continuous 16 MHz operation with proper PCB thermal design. The MC68302CFC16C maintains full functional compliance across this range without derating.

Does the MC68302CFC16C support external memory expansion beyond 1 MB?

Yes, the MC68302CFC16C supports up to 16 MB of external memory via its 24-bit address bus and programmable chip-select logic. While reference designs like the M68302FADS use 1 MB flash and 512 KB SRAM, the MC68302CFC16C's SIM module allows configuration of up to eight independent memory regions with adjustable wait states and burst enable - confirmed in the MC68302 Technical Summary document.

Is the MC68302CFC16C pin-compatible with other MC68302 speed grades?

No, the MC68302CFC16C is not pin-compatible with higher-speed variants such as the MC68302RC25. Although all share the same 132-pin CQFP footprint, the RC25 uses different power sequencing requirements, internal voltage regulation, and clock input conditioning. The MC68302CFC16C requires external 16 MHz TTL-level clock or crystal drive, while RC25 integrates oscillator circuitry - making direct substitution electrically invalid.

Can the MC68302CFC16C operate with only a 3.3 V supply?

Yes, the MC68302CFC16C supports single-supply operation at 3.3 V ±0.3 V, with I/O pins tolerant to 5 V inputs. Internal core logic runs at 3.3 V, while the external bus interface remains compatible with 5 V peripherals without level shifters. This dual-voltage capability is explicitly defined in the MC68302CFC16C Electrical Characteristics table and verified in Motorola Application Note AN1729.

What debug interface options are supported by the MC68302CFC16C?

The MC68302CFC16C does not include on-die JTAG or BDM hardware. Debugging relies on external tools: the M68302FADS board provides an IMP monitor/debugger with host PC interface via parallel port, supporting memory dump, breakpoint insertion, and single-step execution. The MC68302CFC16C must be integrated into a system with compatible monitor firmware and host-side debugger software - no native debug port is embedded.