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A good volt-ohm meter (VOM) and an oscilloscope should be available on the workbench at all times. A display instrument we will be using in almost every experiment is the 16-characterby-2-line LCD, but I am not listing it here as a necessity because we are using it as an electronic component onboard the breadboard, as opposed to using it as separate instrument. Having an oscilloscope is really a must, and learning how to use it effectively is a never-ending life-long learning experience. If you don t have one, get one on eBay as soon as possible. An inexpensive dual-trace 20 MHz scope will be more than adequate for all your needs. An oscilloscope gives you the ability to see things, which is both very powerful and very useful for all investigators.
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note A 20 MHz oscilloscope is just fine for much higher frequencies. The problem
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with looking at higher frequencies is that they will not be seen as crisp square waves because the scope cannot respond rapidly enough. You will still see the square waves; it s just that the corners will be rounded a bit. This does not bother what we are interested in. Even a cheap 5 MHz scope is fine. The important thing is to have a scope, and one with dual traces is the scope of choice. This way, you can compare waveforms and see relative timings.
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The ProPeller ChiP: An overAll DesCriPTion
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The official identification number of the Propeller chip is P8X32A-D40 for the 40-pin version. The Propeller chip is manufactured by Parallax and is available to the general public in single unit quantities, via the Internet, for $8 each as of this writing. For that small amount of money you get eight 32-bit processors that access a rather adequate 32KB shared RAM and 32 lines of I/O. This is unprecedented power and value for those of us who need to use microprocessors to do our day-to-day work in the engineering office, the university laboratory, the technician s workbench, or the hobbyist s workshop. Of course, manufacturers also have a serious interest in this powerful chip, but here we are talking about an introduction for the beginner, so we will not go into what we might do in an industrial environment. Once you understand the basics, moving up to more advanced techniques can be undertaken without difficulty. Figure 2-1 provides the pin designations for the 40-pin DIP version of the Propeller chip. The Spin language uses the inner P designations for accessing the I/O pins. The external pin numbers are not used. (We will not use them either.) In this book, all references to the Propeller Manual are made to the latest version of the manual as revealed by Parallax (Version 1.1). The latest version is the version Figure 2-1 The pin available under the Help menu in the Propeller Tool and designations for the on the Internet, where it can be downloaded at no 40-pin Propeller chip charge.
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Basic Propeller Specifications
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Parallax uses bytes (8 bits), words (16 bits), and longs (32 bits) for its memory descriptions. The Propeller chip has the following basic specifications:
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The Parallax model designation for the chip is P8X32A-D40. It is a 40-pin DIP chip. It runs at 3.3 volts DC (VDC). The chip can be run at from DC to 80 MHz. It contains eight 32-bit processors called cogs. Each of the eight cogs has 512 32-bit longs as its own RAM. There are 32KB of RAM and 32KB of ROM accessible to each cog in a roundrobin fashion. (This is hub memory.) It has 32 I/O lines that can be addressed by all the cogs at all times. Each individual I/O line can sink 32 milliamps. Any eight I/O lines can together source a maximum of 100 milliamps at any one time. A management scheme allows the eight cogs to access all other resources in a round-robin fashion. Any number of the eight cogs can be on or off at any one time. One cog must remain on to allow the system to stay alive. Cogs can be loaded with new software in real time. Any cog can turn any other cog off and start the next available cog. (They are identical.)
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