NXP Semiconductors MC68340FE16E

Overview

MC68340FE16E from Freescale Semiconductor (formerly Motorola) is a 32-bit integrated microcontroller unit (MCU) built on the CPU32 core, featuring an on-chip DMA controller, serial module, dual timer modules, and system integration peripherals. It operates at 16 MHz, supports 24-bit addressing (16 MB address space), includes 512 bytes of on-chip RAM, and integrates chip select logic, clock synthesizer, and IEEE 1149.1 JTAG test access for embedded industrial control applications.

For engineers reviewing the MC68340FE16E datasheet, MC68340FE16E pinout, MC68340FE16E application, or MC68340FE16E equivalent, key selection considerations include its 16 MHz CPU32 execution speed, integrated DMA for memory-to-peripheral transfers without CPU intervention, 24-bit external bus interface with programmable wait states, and support for background debug mode via BDM signals - all critical for deterministic real-time firmware development in legacy industrial systems.

Technical Context

The MC68340FE16E implements the CPU32 32-bit instruction set architecture with full M68000 family compatibility, including new instructions like LPSTOP and TBL. Its System Integration Module (SIM) provides centralized control of clock generation, interrupt handling, chip selects, and system protection registers - enabling single-chip system design without external glue logic.

The integrated DMA controller supports two independent channels with configurable transfer size (byte/word), source/destination addressing modes (fixed/incrementing), and priority arbitration. The serial module offers dual asynchronous channels (SCI-A/SCI-B) with RTS/CTS flow control and programmable baud rates, while dual 16-bit timers support input capture, output compare, and PWM generation.

Key Specifications

Pinout & Package

MC68340FE16E is housed in a 132-pin ceramic quad flat pack (CQFP) package with 0.65 mm lead pitch, designed for high-reliability industrial and aerospace environments. Pin assignments are defined per the MC68340UM/AD User's Manual Section 2 (Signal Descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68340FE16E, MC68332ACPV16 reduces peripheral integration to lower cost and power, while MC68360EM25C extends performance and communications capability - making the MC68340FE16E optimal for stable, cost-sensitive industrial control where proven DMA+SCI functionality meets exact requirements without overengineering.

Availability

MC68340FE16E is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy CNC machine controllers, and telecom line card management systems requiring stable component supply and long-term obsolescence mitigation.

Supply support for MC68340FE16E 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) was a leading designer of embedded processors and analog/mixed-signal ICs, founded from Motorola's semiconductor division and focused on automotive, industrial, and networking applications.

The MC68340 belongs to the M68300 family of integrated microcontrollers targeting deterministic real-time control in harsh environments; it was engineered to replace discrete MPU+peripheral designs with a single-chip solution for factory automation and infrastructure equipment.

FAQ

What is the maximum operating frequency of the MC68340FE16E?

The MC68340FE16E is rated for a maximum CPU clock frequency of 16 MHz, as specified in the Freescale MC68340UM/AD User's Manual Section 11 (Electrical Characteristics). This frequency determines instruction execution speed, bus timing margins, and real-time response limits. Operation above 16 MHz may cause timing violations in the external bus interface or internal peripheral modules, and is not guaranteed by characterization data. The MC68340FE16E uses an external crystal or oscillator connected to EXTAL/XTAL pins, with the on-chip clock synthesizer generating the final system clock.

Does the MC68340FE16E support JTAG debugging?

Yes, the MC68340FE16E implements IEEE 1149.1 Test Access Port (TAP) as documented in Section 9 of the MC68340UM/AD User's Manual. It provides boundary-scan testing capability and supports in-circuit emulation via the TCK, TMS, TDI, and TDO signals. While JTAG enables structural testing and debug probe attachment, the primary debug interface for firmware development is Background Debug Mode (BDM), which uses a separate single-wire interface (BKPT, FREEZE, and associated signals) for non-intrusive runtime inspection and control of the MC68340FE16E.

How much on-chip RAM does the MC68340FE16E include?

The MC68340FE16E integrates 512 bytes of on-chip static RAM, located at fixed addresses within the CPU32 address map. This RAM is used for stack operations, register save areas during exception handling, and temporary data storage - reducing dependency on external memory in minimal system configurations. Unlike larger members of the M68300 family (e.g., MC68360), the MC68340FE16E does not include on-chip ROM or flash; program code must be loaded from external memory or executed from external EPROM/Flash mapped into the 16 MB address space.

What peripheral modules are integrated into the MC68340FE16E?

The MC68340FE16E integrates five major functional modules: (1) CPU32 core with M68000 instruction set compatibility, (2) System Integration Module (SIM) handling clock synthesis, interrupt control, chip selects, and system protection, (3) Direct Memory Access (DMA) controller with two independent channels, (4) Serial Module (SCI-A and SCI-B) supporting asynchronous communication with RTS/CTS flow control, and (5) Timer Modules (TIM1 and TIM2) providing 16-bit input capture, output compare, and PWM generation. These modules are accessed via memory-mapped registers within the MC68340FE16E's address space.

Is the MC68340FE16E pin-compatible with other MC68340 variants?

Yes, the MC68340FE16E shares the same 132-pin CQFP package and pinout as other speed-grade variants of the MC68340 (e.g., MC68340FE20E, MC68340FE25E), as confirmed by mechanical drawings in Section 12 of the MC68340UM/AD. Electrical characteristics such as AC timing parameters and DC voltage tolerances differ by speed grade, but PCB layout and socketing remain identical. This allows drop-in replacement for frequency upgrades or downgrades without hardware modification - provided system timing constraints (e.g., external memory access speed) are re-validated for the new speed grade.