This is H2O Distributors detailed, step-by-step instructions and a reverse osmosis diagram for installing a standard reverse osmosis water purification system. An Flash animated version of this guide and exploded diagram of a typical reverse osmosis system are also provided. 8051 ide download - program to begin studying the 8051 microcontroller 8051 ide (8051.exe). 8051 ide is a simple 8051 microcontroller emulator for the 8051 series of microcontrollers, like 8052, 8031, 8751, 8752, etc. The program is very simple to use and is a good one for those beginning to do 16-bit microcontroller prog.

8052.com Single Board Computer (SBC)SBC Hardware:Main | SBC Schematic/Parts List | Technical Details | All pages in PDF format
SBC In-System Programming:Information | VisISP-52 ISP Application
SBCMON Monitor/Operating System:Main Page | Manual
SBCMON-based Software:SBCMON Monitor | Keypad Demo | LCD Echo Demo | Hardware Clock | Software Clock
SBCMON-based PS/2 Software:PS/2 Comm Monitor | PS/2 Keyboard | PS/2 Mouse
ORDER 8052.com SBC:PCB, KIT OR BUILT SBC AVAILABLE FOR PURCHASE

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Introduction to the 8052.com SBC

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The 8052.com SBC is a single-board computer designed to be both useful and instructivein illustrating certain concepts commonly encountered in 8052-based development.Although many SBCs already exist, this SBC was designed specifically to formthe basis of thorough technical discussions and tutorials consistent with those found on this website--it was also specifically designed to compliment The 8051/8052 Microcontroller Book that wasauthored by Craig Steiner, the webmaster of 8052.com. Nothing was included in this SBC that does not serve a specific educational purpose and implementations that would confuse or unnecessarily complicate the design were intentionally omitted in favor of easy-to-understand approaches so thatthe important topics could be covered without being lost in the details. Every aspect ofthe 8052.com SBC is completely explained in the book.

This SBC was also designed with a worldwide market in mind. Recognizing that not all partsare easily available in all parts of the world, this SBC intentionally uses common parts thatshould not be difficult to acquire. In some cases the use of common parts may not have beenthe optimum design but in these cases the efficiency was sacrificed in favor of universality.

The board was developed with the Atmel AT89S8252/AT89S8253 and Dallas DS89C420 in mind but can be usedwith any 40-pin 8052 pin-compatible derivative including the traditional true-blue8052, 8051, 8032, 8031, etc.; Additionally, this SBC will work with the new Atmel AT89S8253 thathas been announced to replace the AT89S8252. Its feature-set is such that the user may use the SBC simply to learnand master the 8052 microcontroller but may also subsequently use it as a base for his orher own projects and designs.

8052.com SBC Features

Some notable features of the 8052.com SBC are:

1. In-System Programming. Atmel AT89S8252 and Dallas DS89C420 can be programmed in-system without having to remove the microcontroller and without need for a part programmer or special cables.
2. Serial Port/UART. Includes a single standard RS-232 compatible DB9 port that can be used to interface and communicate with external devices such as a standard PC. This is also useful in explaining the concept of serial communications.
3. 16x2 LCD. Includes a 16 column by 2 row LCD that can be connected to the circuit either by direct connection (the lines being driven directly by port pins of the microcontroller on P1 and P3) or as a memory-mapped device (accessed with the MOVX instruction). This is useful in explaining communication with external devices by controlling individual I/O lines. It also is useful in explaining the concept of memory-mapped devices.
4. 4x4 Keypad. A 4x4 matrix keypad which allows the user to input the numbers 0 through 9 plus provides 6 special function keys. This is useful in explaining the concept of key debounce.
5. Real Time Clock. The SBC includes a DS1307 Real-Time Clock. In addition to providing time-keeping capabilities this part is instrumental in demonstrating inter-chip communication using the I2C protocol.
6. Serial EEPROM. The SBC includes an Atmel AT25010A serial EEPROM which provides 128 bytes of non-volatile memory. More importantly it provides an opportunity to demonstrate inter-chip communication using the SPI protocol.
7. EPROM. The SBC may be configured to run code out of an EPROM inserted into the circuit. This is useful if the microcontroller being used does not have any on-chip code memory such as traditional 8032s, 8052s, etc. Those using a microcontroller with on-chip code memory may choose to omit the EPROM.
8. Code RAM. The SBC includes 32k of code RAM. This is RAM that has been wired such that the SBC will access it as RAM as well as code memory. This allows the user to download code into the RAM and execute it from RAM without having to burn a new EPROM or reprogram the microcontroller.
9. Access to all I/O lines. All data, address, and relevant signal lines are exposed on connector blocks such that the SBC may easily be expanded to circuits on external PCBs.
10. Addressable LED. P1.0 may be optionally connected to a LED for testing simple programs that cause the LED to flash.
11. Dual reset circuits. The SBC includes both a traditional resistor-capacitor (RC) network to provide the reset signal and also includes a more reliable MN13811 reset supervisor. Which solution is used to provide the reset signal is selectable with a jumper.

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Why use an SBC?

SBCs were very popular before about the year 2000. Short of expensive in-circuitemulators (ICE), SBCs were one of the cheapest ways to quickly test 8052 firmware and/orexperiment with the 8052 and attached devices. With the advent of low-priced evaluation boards from semiconductors companies such as Signal Laboratories, TexasInstruments, and Analog Devices, the demand for SBCs has dropped as many have foundthese evaluation boards to provide near-ICE functionality for under $200.

However, SBCs may still have a place in one's effort to learn and experiment withthe 8052. An SBC provides the opportunity to understand what the 8052 is doing at theelectrical level as it interfaces with external RAM, keypads, LCDs, serial ports,and buttons. Additionally, this SBC can be built by anyone with the parts and asoldering iron while most new evaluation boards must be purchased directly from themanufacturer and use surface mount technology that is not easily assembled by thenovice or student. This SBC also utilizes parts that should be available in virtuallyany country without having to import parts from foreign sources. And, of course, thisSBC can be used with virtually any 8052-compatible 40-pin DIP microcontroller so theuser can actually build the SBC with almost any 8052 derivative that is availablelocally.

In short, using an SBC--and especially building one--forces an understanding of the8052's architecture and external electrical connections that might be missed if theuser immediately uses a modern evaluation board without understanding the underlyingfundamentals.