NXP Semiconductors DSP56F826BU80E

Overview

DSP56F826BU80E from NXP Semiconductors (formerly Freescale) is a 16-bit Digital Signal Controller integrating DSP and MCU functionality in a unified C-efficient architecture. It delivers up to 40 MIPS at 80 MHz core frequency, features 31.5 KB program Flash, 4 KB data RAM, and supports external memory expansion up to 64 KB per space - used in motor control, noise suppression, and POS terminals.

For engineers reviewing the DSP56F826BU80E datasheet, DSP56F826BU80E pinout, DSP56F826BU80E application, or DSP56F826BU80E equivalent, key selection considerations include its 100-pin LQFP package, dual-voltage operation (2.5 V core / 3.3 V I/O), JTAG/OnCE debug interface, and peripheral flexibility including SSI, dual SPI/SCI options, and Quad Timer.

Technical Context

The DSP56F826BU80E implements the 56800E core with dual-Harvard architecture enabling up to six parallel operations per instruction cycle. Its processing engine includes a 16×16-bit MAC unit delivering 36-bit results, two 36-bit accumulators, hardware DO/REP loops, and 14 addressing modes optimized for both signal processing and real-time control.

Memory subsystem supports concurrent access via three internal address buses and four internal data buses. Peripherals include one Synchronous Serial Interface (SSI), configurable as six-pin port or GPIO, plus dual SPI interfaces (one fixed, one multiplexed with SCI0/SCI1), and a 7-pin General Purpose Quad Timer with dedicated and shared pin allocation.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital signal controller applications.

Compared with DSP56F827FU80, DSP56F826BU80E omits CAN but retains identical motor control latency and memory bandwidth; versus MCF51JM128CLK, it delivers superior real-time signal processing throughput at lower clock frequency and power.

Availability

DSP56F826BU80E is available at Aetrix Electronics and suitable for motor control systems, noise suppression devices, and POS terminals requiring stable component supply, long-term lifecycle support, and industrial temperature-grade reliability.

Supply support for DSP56F826BU80E 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The DSP56F826BU80E belongs to NXP's legacy 56800E digital signal controller family, designed specifically for cost-sensitive, high-performance embedded control applications requiring integrated DSP acceleration and MCU programmability.

FAQ

What is the maximum operating frequency of the DSP56F826BU80E?

The DSP56F826BU80E operates at a maximum core frequency of 80 MHz, delivering up to 40 million instructions per second (MIPS). This frequency is achieved using an internal PLL-based clock generator that multiplies the input crystal or external clock source. The device supports configuration for 40 MHz, 60 MHz, or 80 MHz operation depending on system requirements and thermal constraints. All timing specifications in the datasheet are validated at this rated frequency.

Does the DSP56F826BU80E support in-circuit programming and debugging?

Yes, the DSP56F826BU80E supports full in-circuit programming and real-time debugging via its JTAG/OnCE™ interface. Pins TCK, TMS, TDI, TDO, and TRST provide IEEE 1149.1-compliant boundary scan and on-chip emulation capabilities. Firmware can be loaded, breakpoints set, registers inspected, and memory modified at full speed without halting system operation. The BootFLASH area also enables field-upgradable bootloader deployment through the same JTAG port.

How many general-purpose I/O pins does the DSP56F826BU80E provide?

The DSP56F826BU80E provides 46 total GPIO pins: 16 dedicated (GPIOB0–B7, GPIOD0–D7) and 30 shared (multiplexed with peripherals such as SSI, SPI, SCI, Quad Timer, and external bus signals). All GPIOs are individually configurable as input or output with software-controllable pull-up enable. After reset, most shared pins default to their peripheral functions, requiring explicit register writes to enable GPIO mode.

What memory types and capacities are integrated into the DSP56F826BU80E?

The DSP56F826BU80E integrates 31.5 KB of on-chip Program Flash, 2 KB of BootFLASH, 2 KB of Data Flash, 4 KB of Data RAM, and 512 bytes of Program RAM. All Flash memory is erasable in 256-word pages or bulk, and programmable via JTAG. The architecture supports external memory expansion up to 64 KB for both program and data spaces using the 16-bit external bus interface with configurable wait states (0–12).

Is the DSP56F826BU80E pin-compatible with other members of the 56F8xx family?

The DSP56F826BU80E is pin-compatible with the DSP56F827FU80 in the 100-pin LQFP package, sharing identical pin assignments for power, clocks, external bus, JTAG, and primary peripherals. However, it is not pin-compatible with the 64-pin or 80-pin variants (e.g., DSP56F803, DSP56F805), nor with the DSP56F807 which uses a different package and peripheral mapping. Always verify pin function tables in the respective datasheets before board-level substitution.