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THE BASIC STAMP 2 MICROCONTROLLER
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TABLE 15-1 FEATURES Speed RAM Bytes EEPROM I/O Pins Source/Sink
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The Features of the Different BS2s BS2-IC 4k in/s 26 2k 16 + 2s 20/25 BS2E-IC 4k in/s 26 16k 16 + 2s 30/30 BS2SX-IC 10k in/s 26 16k 16 + 2s 30/30 BS2P24-IC 12k in/s 26 16k 16 + 2s 30/30 BS2P40-IC 12k in/s 26 16k 32 + 2s 30/30 PS2PE-IC 6k in/s 26 16k 16 + 2s 30/30 BS2PX-IC 19k in/s 26 16k 16 + 2s 30/30
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RAM and EEPROM are specified in bytes, and while the EEPROM seems reasonable, the 26 bytes of RAM (used for variables) probably seems to be unusable. Look through the example applications presented in this book and you will probably be surprised to see that very sophisticated applications can be created for the BS2, despite the apparently limited variable memory available to it. As a rule of thumb, remember that every 2k of EEPROM will store 500 Stamp BASIC statements. Along with a set number of general-purpose I/O pins, there are two RS-232 serial interface I/O pins available for application use and communicating with another computer. The RS-232 interface consists of a voltage stealing circuit, so a standard 15 to 3 V and +3 to +15 V RS-232 can be used safely. The RS-232 serial port pins double as programming interface and debug communications pins. All I/O pins, except for the two serial interface pins are bi-directional and perform a variety of different functions that are described later in this chapter. Finally, the amount of current the I/O pins can source (provide to a device) or sink (take away from a device) is measured in milliamps. With the fairly low currents output from the different stamps, it should be noted that they can only control a logic gate, transistor, or LED or two. They do not have sufficient power to drive motors or other magnetic devices. All the BASIC Stamps have a built-in power supply, but as I will discuss later in this chapter, it should be bypassed for most applications and instead an external regulated power supply should be used. The reason for this recommendation is due to the low current sourcing capability of the power supply on the BS2 if an excessive amount of current is drawn the power supply can be burned out. The Javelin Stamp executes Java code rather than the Stamp BASIC of the other two types of Stamps. It executes approximately 8.5k instructions per second and has 32k bytes of variable space as well as 32k of EEPROM program memory. The Javelin is generally plug compatible with the BS2, but there will be issues with timing the code to match the application timing of the BS2s. With all these different Stamp options to choose from, which one is right for you For most applications and if you are starting out, the simplest BASIC Stamp 2, the BS2IC will probably be the best. This part, while seemingly less than the other versions of the
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15.2 INSIDE THE BASIC STAMP
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BS2, will be fast enough and have enough EEPROM memory for most applications and it costs as much as 40% less than the other BS2s. The application code written for the BS2IC can be used with only very minor changes (specifically in the areas of timing) in the other BS2 part numbers, so any investment in software will not be wasted if high-performance BS2s are required later. Starting at the low end of any device family is always a good idea. With the BASIC Stamp 2, there are 20 to 30 different permutations and combinations or BS2 part number, packaging options, and carrier board options. If you consider the literally thousands of different microcontrollers available in the market that could be used in a robot, the number of options that you have would certainly be greater than 10,000. As you learn more about electronics, programming, and microcontrollers, you will begin to develop preferences for different technical features in the chips you work with; but for now, start with a simple device that is extremely popular (which means there are a number of applications and books that you can reference), can be interfaced to and programmed easily, and is supported by an excellent company with a good variety of data sheets, products, and services you can rely on. When these factors were taken into consideration, the BS2 seemed to be the correct single choice for demonstrating in this book how a microcontroller worked rather than trying to use a variety of different devices for the job.
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