NXP Semiconductors DSP56F826BU80

Overview

DSP56F826BU80 from Freescale Semiconductor is a 16-bit Digital Signal Controller (DSC) integrating DSP and MCU functionality in a unified C-efficient architecture. It delivers up to 40 MIPS at 80 MHz core frequency, features a 16×16+36-bit MAC unit with two 36-bit accumulators, and includes 31.5 KB program Flash, 4 KB data RAM, and a 100-pin LQFP package - deployed in noise suppression systems, ID tag readers, and remote metering.

For engineers reviewing the DSP56F826BU80 datasheet, DSP56F826BU80 pinout, DSP56F826BU80 application, or DSP56F826BU80 equivalent, key selection considerations include its dual-Harvard 56800E core, JTAG/OnCE™ debug interface, 46 GPIO (16 dedicated + 30 shared), PLL-based clock generation, and support for external memory expansion up to 64 KB per space.

Technical Context

The DSP56F826BU80 implements a dual-Harvard 56800E core with three parallel execution units enabling up to six operations per instruction cycle. Its hardware DO/REP loops, 14 addressing modes, and barrel shifter optimize real-time control code density and deterministic timing.

Memory subsystem supports simultaneous access to program and data spaces: on-chip includes 31.5K × 16-bit Program Flash, 2K × 16-bit Data Flash, 4K × 16-bit Data RAM, and 2K × 16-bit Boot Flash; off-chip expansion supports up to 64K × 16-bit each for program and data memory with configurable wait states (0–12).

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, with separate 2.5V core (VDD), 3.3V I/O (VDDIO), and 3.3V analog (VDDA) power domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DSP56F826BU80, DSP56F827FU80 adds CAN without sacrificing pin compatibility or core performance, while MC56F8323VFA trades external bus flexibility for higher-integration analog peripherals and modern compiler toolchain support - making DSP56F826BU80 optimal for cost-sensitive, memory-expandable industrial control.

Availability

DSP56F826BU80 is available at Aetrix Electronics and suitable for noise suppression systems, ID tag readers, and remote metering requiring stable component supply across extended product lifecycles.

Supply support for DSP56F826BU80 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) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The 56F8xx family was designed specifically for cost-sensitive, real-time embedded control applications requiring both DSP math acceleration and MCU peripheral integration - targeting motor control, power conversion, and sensor signal conditioning.

FAQ

What is the maximum operating frequency of the DSP56F826BU80?

The DSP56F826BU80 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 that multiplies an external 4 MHz crystal input or accepts a direct external clock source. The device maintains timing integrity across its full –40°C to +85°C operating temperature range under specified 2.5V core and 3.3V I/O supply conditions.

Does the DSP56F826BU80 support in-circuit programming and debugging?

Yes, the DSP56F826BU80 includes a full JTAG/OnCE™ debug interface compliant with IEEE 1149.1. It supports non-intrusive real-time debugging, hardware breakpoints, watchpoints, and flash memory programming via the TCK/TMS/TDI/TDO/TRST pins. The OnCE module operates independently of core clock speed, enabling reliable debug sessions even at minimum power modes or during low-frequency operation.

How much on-chip memory does the DSP56F826BU80 provide?

The DSP56F826BU80 integrates 31.5K × 16-bit Program Flash, 2K × 16-bit Data Flash, 512 × 16-bit Program RAM, 4K × 16-bit Data RAM, and 2K × 16-bit Boot Flash. All Flash memory blocks are field-programmable via JTAG and support page erase (256-word pages) and bulk erase. The Boot Flash is reserved for customer-developed ISP routines used to update main program and data Flash areas securely.

What peripheral interfaces are available on the DSP56F826BU80?

The DSP56F826BU80 provides one Synchronous Serial Interface (SSI), one primary SPI port, a second SPI or dual SCI configuration (SCI0/SCI1), one General Purpose Quad Timer with seven associated pins, JTAG/OnCE™, COP watchdog, Time-of-Day (TOD) timer, and interrupt controllers. All serial peripherals and the Quad Timer can be remapped to GPIO functions when not actively used, maximizing I/O flexibility in resource-constrained designs.

Is the DSP56F826BU80 pin-compatible with other members of the 56F8xx family?

The DSP56F826BU80 is pin-compatible with the DSP56F827FU80 in the 100-pin LQFP package, sharing identical power, clock, address, data, and peripheral pin assignments. However, it is not pin-compatible with later-generation 56F83xx devices due to architectural changes including removal of the external bus interface and addition of integrated analog peripherals. Always verify pin function mapping against the specific device's signal description table before board reuse.