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Application notes that cover more specialized aspects of the chip s operation are posted on the Parallax website for downloading at no charge. The discussion forums maintained by Parallax provide additional support that gives you access to everything you need at your level of expertise and understanding. The discussion forums are active, and a number of informed individuals both from within the Parallax organization and outside it post regularly. The range of what people are doing with the Propeller is extensive and impressive, even amazing. I urge you to read these forums regularly and participate in them as often as the need arises. Parallax also provides live person on the phone technical support for the Propeller chip at no charge!
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Parallax, Inc.
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Parallax, Inc., is located in Rocklin, California. It is a relatively small corporation that provides microcontrollers, development tools, sensors, and robotics for industrial and educational organizations as well as for hobbyists, with their BASIC Stamp , PropellerTM, and other related product lines. Parallax can be reached through the mail at the following address: Parallax, Inc. 599 Menlo Drive Rocklin, California 95765 USA Phone numbers are Office: Toll-free sales: Toll-free tech support: Their website is: http://www.Parallax.com/ The discussion forum for the Propeller chip can be found at: http://forums.Parallax.com And some other resources of interest include: Wikipedia Various independent Internet forums dedicated to Propeller usage (916) 624-8333 (888) 512-1024 (888) 997-8267
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In the most general of terms, the Propeller chip consists of a bank of eight 32-bit RISClike (but not true RISC) microprocessors (called cogs ) with some shared memory
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that also share 32 I/O pins between them. Each of the eight processors can access these 32 I/O pins at all times. The 32 pins are accessed by setting the direction of each pin as either an input or an output (and, of course, the condition of the pin as high or low if it is designated to be an output). In order to coordinate the operation of the eight microprocessors, a hardware device called a hub accesses each processor in a round-robin fashion as controlled by the system counter and the system clock. Each cog has access to the system for the same amount of time. The eight cogs are independent of one another and are identical in every detail. The chip provides a bank of memory that can be accessed by each of the cogs when it is the cog s turn to do so, as determined by the hub. Other ancillary functions such as reset delays and oscillator inputs are also provided. In general, the resources available on the chip can be divided into two families, referred to as the common and the mutually exclusive resources. The common resources, which encompass all the I/O pins and the system counter, are available to all the cogs at all times. This means that any number of cogs can access these simultaneously. The mutually exclusive resources, on the other hand, can only be accessed when it is a cog s turn to have control of the system. As mentioned previously, the controlling sequence is managed by the processor hub, which gives access to each cog in a round-robin fashion. Doing this in an orderly way allows the system to stay in sync at all times. The system clock is a programmable speed device that can be controlled by an internal circuit, a phase-locked loop, and a crystal oscillator, as may be decided on by the system programmer/designer. The system clock itself is a 32-bit counter that is incremented during each cycle of the system oscillator. The system does not keep track of how many times this counter overflows, and the major use of this counter is for timing delays and other time-related functions that do not need to know how often the clock has overflowed. If you need to know how many times the clock counter has overflowed, you have to design a routine that will do that for you as a part of your program. The operation of the system clock is under the control of the clock register. The clock rate is programmable from 20 KHz to 80 MHz. The hub and the bus operate at half the rate of the system clock. (The slower the clock rate and the fewer the cogs in operation, the lower the power the system uses and the savings can be substantial.) Each of the eight identical cogs has the following resources within it:
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A 32-bit reduced instruction set (RISC-like) processor 2KB of cog RAM Two input/output assistants with phase lock loops Two powerful counter modules A video generator
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A number of special-purpose registers are designated in the RAM to read the system counter, to manage I/O pin direction and states, and to configure the counter modules and video generator hardware. The lock bits are special and are located in their own register in the hub; they are accessible from the lock commands only.
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