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DSP56857 bảng dữ liệu(PDF) 71 Page - Freescale Semiconductor, Inc

tên linh kiện DSP56857
Giải thích chi tiết về linh kiện  Digitial Signal Controller
PDF  662 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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DSP56857 bảng dữ liệu(HTML) 71 Page - Freescale Semiconductor, Inc

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Introduction
Overview, Rev. 4
Freescale Semiconductor
2-3
2.1 Introduction
This chapter details the input and output signals and functions of 568x packaging. Depending on
the device, their pins allow a variety of functions and capabilities. Each is detailed in this chapter.
In addition to the available peripherals, up to 47-general purpose pins are also available when not
required for other purposes. The remaining signal pins are dedicated to one function. The input
and output signals of these packages are organized into functional groups, shown in Table 2-1
and illustrated in Figure 2-1 through Figure 2-5. Each table row describes the package pins and
the signal or signals present in Table 2-2 through Table 2-15. Interface signals have these
general characteristics:
•
Pins listed here are pulled high with an on-chip resistor
— TDI
— TMS
— TRST
— DE
•
This pin is pulled low with an on-chip resistor:
—TCK
•
These pins are pulled high by the device during hardware reset:
— RD
— WR
•
These pins have the internal pull-ups permanently disabled:
— MODA
— MODB
— MODC
•
General Purpose I/O pins have programmable pull-up resistors



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