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56855 Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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56855 Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 52 page  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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