Difference between revisions of "Minimig Shared RS232"

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(rs232 fix)
 
(layout)
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11 1
 
11 1
  
http://en.wikipedia.org/wiki/Rs232#Voltage_levels
+
http://en.wikipedia.org/wiki/Rs232#Voltage_levels<br>
http://www.winpicprog.co.uk/pic_tutorial7.htm
+
http://www.winpicprog.co.uk/pic_tutorial7.htm<br>

Revision as of 12:04, 27 July 2007

By wiring the MCU (PIC18) and the fpga via an AND gate one can eliminate the jumper currently present on the rs232 TxD.

RS-232:
Default voltage level is negative (-3 .. -25) = Logical "1"

Truth table: 00 0 01 0 10 0 11 1

http://en.wikipedia.org/wiki/Rs232#Voltage_levels
http://www.winpicprog.co.uk/pic_tutorial7.htm