NXP Semiconductors MC68340AG25E

Overview

MC68340AG25E from Freescale Semiconductor (formerly Motorola) is a 32-bit integrated microcontroller unit (MCU) featuring the CPU32 core, on-chip DMA controller, serial module, dual timer modules, and system integration module (SIM). It operates at 25 MHz maximum clock frequency, supports 24-bit address space (16 MB), 16-bit data bus, and includes programmable chip selects, interrupt handling, and IEEE 1149.1 JTAG test access port. It targets industrial control and embedded communications systems requiring deterministic real-time response.

For engineers reviewing the MC68340AG25E datasheet, MC68340AG25E pinout, MC68340AG25E application, or MC68340AG25E equivalent, key selection criteria include CPU32 instruction set compatibility with M68000 family, integrated DMA for memory-to-peripheral transfers without CPU intervention, SIM-based clock synthesis and bus configuration, and support for external memory expansion up to 16 MB via configurable chip selects.

Technical Context

The MC68340AG25E implements the CPU32 32-bit core - a superset of the M68000 architecture - with enhanced addressing modes, loop mode execution, and low-power STOP instruction. Its System Integration Module (SIM) integrates clock synthesis (via phase comparator and programmable dividers), external bus interface with dynamic sizing, chip select generation, and interrupt management including autovectoring and spurious interrupt detection.

The on-chip DMA controller supports two independent channels with priority arbitration, enabling high-throughput data movement between peripherals (e.g., serial module, timers) and memory. The serial module provides two asynchronous communication channels (SCC A/B) with RTS/CTS flow control, while dual 16-bit timer modules support input capture, output compare, and PWM generation with gate control and external clock inputs.

Key Specifications

Pinout & Package

The MC68340AG25E is housed in a 132-pin ceramic quad flat pack (CQFP) package with 0.635 mm lead pitch, designed for high-reliability industrial applications and compatible with MIL-STD-883 screening requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68340AG25E, MC68332ACPV16 offers lower cost and power but sacrifices DMA bandwidth and serial flexibility, while MC68360VR66B delivers superior performance and integration at the expense of M68K software compatibility and increased complexity.

Availability

MC68340AG25E is available at Aetrix Electronics and suitable for industrial automation, legacy protocol conversion, and embedded HMI applications requiring stable component supply and long-term obsolescence management.

Supply support for MC68340AG25E 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 as Motorola's semiconductor division and focused on automotive, industrial, and networking markets.

The MC68340 belongs to the M68300 family of integrated microcontrollers designed specifically for deterministic real-time control in resource-constrained industrial environments where reliability, long-term availability, and M68K software continuity were critical.

FAQ

What is the maximum operating frequency of the MC68340AG25E?

The MC68340AG25E is rated for a maximum system clock frequency of 25 MHz, as confirmed by its speed grade suffix 'G25'. This defines the upper limit for CPU instruction execution, bus transfers, and peripheral timing - all internal modules (DMA, timers, serial) operate synchronously from this clock domain. External crystal or clock source must meet stability and drive strength specifications outlined in Section 11 of the MC68340UM/AD.

Does the MC68340AG25E support JTAG debugging?

Yes, the MC68340AG25E includes full IEEE 1149.1 Test Access Port (TAP) with TCK, TMS, TDI, and TDO signals, enabling boundary-scan testing and background debug mode (BDM) for non-intrusive in-circuit emulation. This capability is documented in Section 9 of the MC68340 User's Manual and requires compatible BDM pod hardware and debugger software supporting M68K BDM protocol.

How many serial communication channels does the MC68340AG25E integrate?

The MC68340AG25E integrates two independent serial communication channels (SCC A and SCC B), each with dedicated Rx/Tx, RTS/CTS, and transmitter/receiver ready signals. Both channels support asynchronous communication with programmable baud rates and are fully functional per Section 7 of the MC68340UM/AD - no external UARTs are required for dual-port serial applications.

What package type is used for the MC68340AG25E?

The MC68340AG25E is packaged in a 132-pin ceramic quad flat pack (CQFP) with 0.635 mm lead pitch, designated as package code 'E' in Freescale's ordering nomenclature. This hermetically sealed package meets MIL-STD-883 requirements for thermal cycling, mechanical shock, and humidity resistance - intended for high-reliability industrial deployments.

Can the MC68340AG25E directly interface with 32-bit memory devices?

No, the MC68340AG25E features a 16-bit external data bus (D15–D0) and 24-bit address bus (A23–A0), limiting it to 16-bit wide memory devices. While it can access up to 16 MB of address space, interfacing with true 32-bit memory requires external data bus widening logic or multiplexing - neither supported natively by the MC68340AG25E's bus interface architecture as described in Section 3 of the User's Manual.