dsp56857 Freescale Semiconductor, Inc, dsp56857 Datasheet - Page 5

• Manufacturer Part Number: dsp56857
• Description: Dsp56857 Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

1.1.4
1.2 56857 Description
The 56857 is a member of the 56800E core-based family of controllers. It combines, on a single chip, the
processing power of a Digital Signal Processor (DSP) and the functionality of a microcontroller with a
flexible set of peripherals to create an extremely cost-effective solution. Because of its low cost,
configuration flexibility, and compact program code, the 56857 is well-suited for many applications. The
56857 includes many peripherals that are especially useful for low-end Internet appliance applications
and low-end client applications such as telephony; portable devices; Internet audio; and point-of-sale
systems, such as noise suppression; ID tag readers; sonic/subsonic detectors; security access devices;
remote metering; sonic alarms.
The 56800E core is based on a Harvard-style architecture consisting of three execution units operating in
parallel, allowing as many as six operations per instruction cycle. The microprocessor-style programming
model and optimized instruction set allow straightforward generation of efficient, compact DSP and
control code. The instruction set is also highly efficient for C Compilers, enabling rapid development of
optimized control applications.
The 56857 supports program execution from either internal or external memories. Two data operands can
be accessed from the on-chip Data RAM per instruction cycle. The 56857 also provides two external
dedicated interrupt lines, and up to 47 General Purpose Input/Output (GPIO) lines, depending on
peripheral configuration.
The 56857 controller includes 40K words of Program RAM, 24K words of Data RAM and 1K of Boot
ROM.
This controller also provides a full set of standard programmable peripherals that include 8-bit parallel
Host Interface, Two Enhanced Synchronous Serial Interfaces (ESSI), one Serial Peripheral Interface (SPI),
two Serial Communications Interfaces (SCI), and one Quad Timer. The ESSIs, SPI, SCIs IO and Quad
Timer can be used as General Purpose Input/Outputs when its primary function is not required.
Freescale Semiconductor
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* Each peripheral I/O can be used alternately as a General Purpose I/O if not needed
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8-bit Parallel Host Interface*
Time of Day
Up to 47 GPIO
Fabricated in high-density CMOS with 3.3V, TTL-compatible digital inputs
Wait and Stop modes available
Energy Information
56857 Technical Data, Rev. 6
56857 Description
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