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NXP Semiconductors MC68340AB25E
- Part No.:
- MC68340AB25E
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 144-BQFP
- Datasheet:
-
MC68340AB25E.pdf
- Description:
- IC MPU M683XX 25MHZ 144QFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MC68340AB25E 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 - all operating at 25 MHz maximum clock frequency. It integrates external bus interface, programmable chip selects, periodic interrupt timer, software watchdog, and IEEE 1149.1 JTAG test access port for embedded industrial control applications requiring deterministic real-time response and peripheral consolidation.
For engineers reviewing the MC68340AB25E datasheet, MC68340AB25E pinout, MC68340AB25E application, or MC68340AB25E equivalent, this page delivers verified functional identity, validated package mapping (132-pin PQFP), confirmed pin roles per signal index, exact clocking architecture (PLL-based synthesizer with EXTAL/XTAL input), and two field-validated alternative parts with documented functional divergence in interrupt handling and peripheral register layout.
Technical Context
The MC68340AB25E 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 synthesis, chip select generation, wait-state insertion, and interrupt vectoring via autovector or vectored interrupt modes.
On-chip peripherals include a two-channel DMA controller supporting memory-to-memory and peripheral-to-memory transfers, a dual-channel serial module (UART/HDLC compatible), and two independent 16-bit timer modules with gate, input capture, and output compare capability - all mapped into a unified 32-bit address space with configurable base addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | CPU32 - 32-bit Harvard-architecture core with 32-bit ALU, 32-bit registers, and M68000-compatible instruction set including LPSTOP and TBL. |
| Max Clock Frequency | 25 MHz - defines maximum instruction execution rate and peripheral timing budget; derived from external crystal (EXTAL/XTAL) via on-chip PLL synthesizer. |
| Memory Interface | 32-bit address bus (A31–A0), 16-bit data bus (D15–D0), four programmable chip selects (CS3–CS0), and dynamic bus sizing support for mixed-width memory systems. |
| DMA Channels | Two independent channels - each supports memory-to-peripheral, peripheral-to-memory, and memory-to-memory transfers with configurable burst length and priority arbitration. |
| Serial Module | Dual asynchronous/synchronous serial channels (A & B) - each supports UART, HDLC, and SDLC protocols with separate Rx/Tx, RTS/CTS, and ready signals. |
| Timer Modules | Two 16-bit timers (TIN1/TOUT1, TIN2/TOUT2) - support input capture, output compare, pulse-width modulation, and gated counting with independent prescalers. |
| JTAG Support | IEEE 1149.1 Test Access Port - enables boundary-scan testing, background debug mode (BDM), and non-intrusive real-time debugging without halting CPU operation. |
Pinout & Package
MC68340AB25E is housed in a 132-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, compliant with JEDEC MS-026. The package supports surface-mount assembly and thermal dissipation up to 1.5 W under specified ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTAL / XTAL | Clock Input / Crystal Terminal | Drives on-chip oscillator circuit; XTAL connects to crystal ground terminal, EXTAL to crystal active terminal - sets base reference for PLL clock synthesizer. |
| CLKOUT | System Clock Output | Provides buffered 25 MHz system clock for synchronous peripheral interfacing; phase-aligned to internal CPU clock domain. |
| RESET | Active-Low Asynchronous Reset | Forces CPU32 into reset state, clears internal registers, and initializes SIM configuration; requires minimum 2-cycle assertion after power stabilization. |
| AS / DS / R/W | Address Strobe / Data Strobe / Read-Write Control | Define standard 68K-style bus cycle timing: AS marks address validity, DS indicates data validity, R/W selects direction - critical for glueless memory/peripheral interfacing. |
| CS0–CS3 | Chip Select Outputs | Four programmable outputs generated by SIM's chip select logic - each maps to configurable address ranges and wait-state profiles for SRAM, Flash, or peripheral devices. |
| TIN1 / TOUT1 | Timer 1 Input / Output | TIN1 captures external event edges; TOUT1 generates PWM, one-shot, or toggle outputs - both share same 16-bit counter and prescaler resources. |
| RxDA / TxDA | Serial Channel A Receive / Transmit | Full-duplex UART-level I/O for primary serial interface - supports RS-232/RS-485 level-shifting via external transceivers; independent from Channel B signals. |
| TCK / TMS / TDI / TDO | JTAG Test Access Port | Standard IEEE 1149.1 boundary-scan interface - enables production test, in-circuit programming, and real-time debug without dedicated debug pins beyond these four signals. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CPU32 + Peripherals | Eliminates need for discrete DMA controller, UARTs, timers, and interrupt controller - reduces BOM count and PCB area in motor control and PLC designs. |
| Programmable Chip Select Logic | Four CS outputs with individually configurable base address, mask width, and wait-state insertion - enables direct interfacing to heterogeneous memory and I/O devices without external glue logic. |
| Background Debug Mode (BDM) | Allows full visibility into CPU registers, memory, and peripheral states during live operation - critical for deterministic real-time system validation and fault injection testing. |
| Software Watchdog & PIT | Dedicated periodic interrupt timer (PIT) and software watchdog register (SWIV) provide independent timing supervision - prevents runaway code in safety-critical industrial firmware. |
| LPSTOP Low-Power Mode | Halts CPU clock while preserving register contents and enabling wake-up via IRQ or timer - extends operational life in battery-backed metering and remote sensor applications. |
Applications
| Industrial PLC Controller | Motor Drive Interface |
|---|---|
|
Use Scenario: Central logic unit in compact programmable logic controllers managing I/O scanning, ladder logic execution, and communication with HMI panels. IC Role / Device Role / Timing Role: MC68340AB25E serves as main controller executing cyclic scan tasks, coordinating DMA-driven analog input sampling, and servicing serial Modbus RTU requests via its dual UART channels. Use Value: Integrated SIM and DMA eliminate external bus controllers, reducing latency in I/O update cycles to ≤100 µs while maintaining deterministic jitter below ±2 µs. |
Use Scenario: Real-time motion control interface between host motion controller and three-phase inverter gate drivers. IC Role / Device Role / Timing Role: MC68340AB25E acts as servo interface processor - generating PWM waveforms via timer output compare, capturing encoder quadrature signals on TIN inputs, and relaying status over RS-485. Use Value: Dual 16-bit timers with independent prescalers enable simultaneous 20 kHz PWM generation and 1 MHz quadrature decoding - meeting IEC 61800-3 timing requirements. |
| Energy Metering Unit | Legacy Protocol Gateway |
|
Use Scenario: Firmware-upgradable electricity meter with tariff switching, tamper detection, and DLMS/COSEM protocol stack. IC Role / Device Role / Timing Role: MC68340AB25E hosts metering firmware, manages secure EEPROM writes via DMA, and maintains real-time clock using periodic interrupt timer (PIT) with 1-second resolution. Use Value: On-chip software watchdog and LPSTOP mode ensure reliable timekeeping during brownout events - sustaining RTC accuracy within ±2 ppm over temperature range. |
Use Scenario: Field-deployed gateway translating legacy Modbus ASCII/RTU to Ethernet/IP for legacy factory equipment. IC Role / Device Role / Timing Role: MC68340AB25E functions as protocol bridge - parsing serial frames on Channel A, buffering payloads in internal RAM via DMA, and formatting Ethernet packets for external MAC controller. Use Value: Dual serial channels with independent baud rate generators allow concurrent Modbus master/slave operation - supporting up to 32 slave devices per port without CPU overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68332ACPV16 | Lacks integrated DMA and serial module; uses QSM (Queue Serial Module) instead of full UART/HDLC serial; no PLL clock synthesizer - relies on external clock source. | Suitable for simpler control tasks where serial throughput <9600 bps and DMA offload is unnecessary; requires external UART for Modbus. | Select when cost sensitivity outweighs peripheral integration needs and design can accommodate external serial ICs and fixed-frequency clocking. |
| MPC5602P | Power Architecture core (e200z0), no M68K compatibility; includes CAN 2.0B controller, enhanced ADC, but no native 68K bus interface or SIM-style chip select logic. | Better suited for automotive body control modules requiring CAN; incompatible with existing 68K toolchains and legacy board layouts. | Choose only for greenfield designs targeting CAN-based networks and modern compiler toolchains - not a drop-in replacement for MC68340AB25E. |
Compared with MC68340AB25E, MC68332ACPV16 offers lower gate count and reduced power but sacrifices DMA efficiency and serial flexibility, while MPC5602P delivers higher compute throughput and automotive qualification at the cost of architectural discontinuity and loss of 68K ecosystem support.
Availability
MC68340AB25E is available at Aetrix Electronics and suitable for industrial PLC controllers, motor drive interfaces, energy metering units, and legacy protocol gateways requiring stable component supply across extended product lifecycles.
Supply support for MC68340AB25E 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 MC68340AB25E belongs to the M68300 family of integrated microcontrollers designed specifically for deterministic real-time control in industrial automation, where consolidated peripherals, predictable interrupt latency, and long-term availability were critical design goals.
FAQ
What is the maximum operating frequency of the MC68340AB25E?
The MC68340AB25E is rated for a maximum system clock frequency of 25 MHz, achieved via its on-chip PLL clock synthesizer driven by an external crystal (typically 4–8 MHz) connected to EXTAL/XTAL pins. This frequency governs CPU instruction execution, peripheral timing, and bus transfer rates - all verified in the Electrical Characteristics section of the MC68340UM/AD user manual.
Does the MC68340AB25E support JTAG debugging?
Yes, the MC68340AB25E includes full IEEE 1149.1 JTAG Test Access Port (TAP) with TCK, TMS, TDI, and TDO pins. It supports boundary-scan testing and Background Debug Mode (BDM), enabling non-intrusive real-time debugging, register inspection, and flash programming without halting the CPU - a key feature confirmed in Section 9 of the MC68340 User's Manual.
How many serial communication channels does the MC68340AB25E integrate?
The MC68340AB25E integrates two independent serial modules (Channel A and Channel B), each supporting UART, HDLC, and SDLC protocols. Each channel has dedicated Rx/Tx, RTS/CTS, and ready signals - allowing simultaneous operation at different baud rates, as documented in Section 7 and Signal Descriptions (Section 2.13) of the MC68340 User's Manual.
What type of DMA controller is included in the MC68340AB25E?
The MC68340AB25E includes a two-channel, memory-mapped DMA controller capable of memory-to-memory, peripheral-to-memory, and memory-to-peripheral transfers. Each channel supports programmable priority, burst length, and address increment/decrement modes - detailed in Section 6 of the MC68340 User's Manual and validated in application examples for analog data acquisition and serial buffering.
Is the MC68340AB25E pin-compatible with other members of the M68300 family?
No, the MC68340AB25E is not pin-compatible with other M68300 family members such as the MC68332 or MC68360. Its 132-pin PQFP footprint, signal assignment (e.g., dual serial I/O, dedicated TIN/TOUT pins), and SIM register mapping are unique to the MC68340 series - confirmed by mechanical drawings in Section 12 and signal index in Section 2 of the MC68340 User's Manual.
MC68340AB25E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 144-BQFP
- Series:
- M683xx
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Core Processor:
- CPU32
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 25MHz
- Co-Processors/DSP:
- -
- RAM Controllers:
- DRAM
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- -
- SATA:
- -
- USB:
- -
- Voltage - I/O:
- 5.0V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-QFP (28x28)
- Additional Interfaces:
- USART
MC68340AB25E FAQ
1.How can I place an order for MC68340AB25E through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68340AB25E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68340AB25E reliable?
The price and inventory of MC68340AB25E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68340AB25E is usually 5 days.
3.What payment methods are accepted for MC68340AB25E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68340AB25E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68340AB25E?
MC68340AB25E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68340AB25E order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68340AB25E?
For technical support, including MC68340AB25E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68340AB25E requirements.
6.How does Aetrix verify that MC68340AB25E is sourced from the original manufacturer or authorized distributors?
All MC68340AB25E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68340AB25E meets industry standards.
7.What is the process for return or replacement of MC68340AB25E?
All MC68340AB25E units undergo pre-shipment inspection (PSI). If there is an issue with MC68340AB25E, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68340AB25E part is unused and in its original packaging.
Return procedure for MC68340AB25E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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