NOTES ABOUT THIS SCHEMATIC
;* Author 		: Brady Mayes
;* File Name 		: e16_schematic.sch
;* Date			: May 2005
;* Last Update		: May 2005
;* Version		: 1.0.0
;* Support Telephone	: withheld
;* Support Fax		: withheld
;* Support E-mail	: brm016000@utdallas.edu
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The attached schematic is intended to substitute the ATMEL STK500 developer board's debugger display for educational purposes.  

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CRYSTAL
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The 4MHz crystal, Q1 is not a critical value and can range from 1MHz to 10MHz with the AT90S2313-10PC chip, or be as high as 20MHz with the AT_Tiny2313 chip. 

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MICROCONTROLLER
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This schematic was designed with the AT90S2313 in mind.  This chip has recently been replaced with the AT_Tiny2313, which is software-compatible, however this chip was not tested with this schematic.  The unused Port D pins are held near the +5V supply voltage internally by the controller software.

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DISCRETE COMPONENTS
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Capacitors C1 and C2 where monolithic, however other types such as ceramics may be used.  Capacitor C3 was aluminum electrolytic.  All resistors featured had a maximum dissipation of 1/4 watt, however 1/8 watts versions are applicable too.  The LEDs were provided by a bar graph display, however true discrete LEDs are just as useful.

Check http://www.geocities.com/digitan000  for more details.

4:09 AM 5/25/2005
