NXP Semiconductors DSP56857BUE

Overview

DSP56857BUE from NXP Semiconductors (formerly Freescale) is a 16-bit Digital Signal Controller integrating a 56800E DSP core with microcontroller peripherals. It delivers 120 MIPS at 120 MHz, features 40K × 16-bit program SRAM, 24K × 16-bit data SRAM, and 1K × 16-bit boot ROM, and supports real-time audio processing in noise suppression and ID tag reader systems.

For engineers reviewing the DSP56857BUE datasheet, DSP56857BUE pinout, DSP56857BUE application, or DSP56857BUE equivalent, key selection criteria include its dual Harvard architecture, six-channel DMA, two ESSI interfaces for synchronous serial audio/data streaming, and 100-pin LQFP package with up to 47 GPIOs configurable across host, SCI, SPI, and timer functions.

Technical Context

The DSP56857BUE implements a parallel-execution 56800E core with three address buses and four data buses, enabling up to six operations per instruction cycle. Its dual Harvard memory architecture permits simultaneous 3-operand fetches: one program word and two data operands per cycle.

Peripheral integration includes two independent Enhanced Synchronous Serial Interfaces (ESSI0/ESSI1) supporting I²S, AC97, and custom frame formats; two SCIs for UART-style communication; an 8-bit parallel host interface; and a 16-bit quad timer with four dedicated I/O pins (TIO0–TIO3) usable as GPIOG0–G3.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DSP56F807VFA and MPC5604B, the DSP56857BUE provides optimal balance of DSP throughput, ESSI flexibility, and cost for non-automotive embedded audio and sensor processing - retaining full software compatibility within the 56800E ecosystem without unnecessary peripheral bloat.

Availability

DSP56857BUE is available at Aetrix Electronics and suitable for noise suppression systems, ID tag readers, sonic detectors, remote metering devices, and point-of-sale terminals requiring stable component supply and long-term industrial availability.

Supply support for DSP56857BUE 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 company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The DSP56857BUE belongs to NXP's 56800E Digital Signal Controller family, designed specifically for cost-sensitive, real-time embedded applications requiring combined DSP performance and microcontroller flexibility - especially in audio, telephony, and sensor signal conditioning.

FAQ

What is the maximum operating frequency of the DSP56857BUE?

The DSP56857BUE operates at a maximum core frequency of 120 MHz, delivering 120 MIPS performance. This frequency is achieved using the on-chip PLL with external crystal (XTAL) or oscillator (EXTAL) input, and is validated across commercial temperature range (–40°C to +85°C) per the Rev. 6 Technical Data Sheet. The DSP56857BUE maintains full specification compliance at this speed with proper decoupling and thermal management.

Does the DSP56857BUE include on-chip boot ROM, and what is its capacity?

Yes, the DSP56857BUE includes 1K × 16-bit on-chip boot ROM. This ROM contains factory-programmed bootstrap code that initializes the device upon power-up or reset, enabling direct execution from internal memory without external configuration. The boot ROM supports multiple startup modes selected via MODE A/B/C pins and is integral to the DSP56857BUE's self-contained operation in standalone applications.

How many GPIO pins does the DSP56857BUE support, and how are they allocated?

Up to 47 GPIO pins are available on the DSP56857BUE, distributed across Port A (GPIOA0–A3), Port B (GPIOB0–B15), Port C (GPIOC0–C5), Port D (GPIOD0–D5), Port E (GPIOE0–E3), Port F (GPIOF0–F3), Port G (GPIOG0–G3), and Port H (GPIOH0–H2). Each pin is multiplexed with a primary peripheral function (e.g., ESSI, SCI, SPI) and defaults to GPIO after reset unless explicitly configured - confirmed in Table 3-1 of the DSP56857 Technical Data, Rev. 6.

Can the DSP56857BUE execute code directly from its internal program SRAM?

Yes, the DSP56857BUE supports full execution from its 40K × 16-bit on-chip program SRAM. The Harvard architecture allows concurrent instruction fetch and data access, and the boot ROM initializes the memory controller to map program space to internal SRAM by default. This capability eliminates external memory dependencies and reduces system latency - a confirmed feature in Section 1.2 of the DSP56857 Technical Data, Rev. 6.

What debug interface does the DSP56857BUE provide, and is JTAG supported?

The DSP56857BUE provides JTAG/Enhanced On-Chip Emulation (OnCE™) as its primary debug interface, with dedicated pins TCK, TDI, TDO, TMS, and TRST on the 100-pin LQFP package. This interface enables real-time, non-intrusive debugging including breakpoints, watchpoints, and trace without halting peripheral operation - fully documented in Section 1.1.1 and Figure 2-1 of the DSP56857 Technical Data, Rev. 6.