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56855 Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc

Part No. 56855
Description  16-bit Digital Signal Controllers
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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56855 Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc

 
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56855 Description
56855 Technical Data, Rev. 6
Freescale Semiconductor
5
Six (6) independent channels of DMA
Time-of-Day (TOD)
•Up to 18 GPIO
* Each peripheral I/O can be used alternately as a General Purpose I/O if not needed
1.1.4
Energy Information
Fabricated in high-density CMOS with 3.3V, TTL-compatible digital inputs
Wait and Stop modes available
1.2 56855 Description
The 56855 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, creating an extremely cost-effective solution. Because of its low cost,
configuration flexibility, and compact program code, the 56855 is well-suited for many applications. The
56855 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 code for both
DSP and MCU applications. The instruction set is also highly efficient for C Compilers, enabling rapid
development of optimized control applications.
The 56855 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 56855 also provides two external
dedicated interrupt lines, and up to 18 General Purpose Input/Output (GPIO) lines, depending on
peripheral configuration.
The 56855 controller includes 24K words of Program RAM, 24K words of Data RAM and 1K of Boot
ROM. It also supports program execution from external memory.
This controller also provides a full set of standard programmable peripherals that include one Enhanced
Synchronous Serial Interface (ESSI), two Serial Communications Interfaces (SCI), and one Quad Timer.
The ESSI, SCIs, four chip selects and Quad Timer external output can be used as General Purpose
Input/Outputs when its primary function is not required.


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