Difference between revisions of "Minimig Shared RS232"

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Default voltage level is negative (-3 .. -25) = Logical "1"<br>
 
Default voltage level is negative (-3 .. -25) = Logical "1"<br>
  
Truth table:
+
AND Truth table:
00 0
+
:{| class="wikitable"
01 0
+
|-
10 0
+
! Input0 !! Input1 !! Output
11 1
+
|-
 +
| 0 || 0 || 0
 +
|-
 +
| 0 || 1 || 0
 +
|-
 +
| 1 || 0 || 0
 +
|-
 +
| 1 || 1 || 1
 +
|}
  
 
http://en.wikipedia.org/wiki/Rs232#Voltage_levels<br>
 
http://en.wikipedia.org/wiki/Rs232#Voltage_levels<br>
 
http://www.winpicprog.co.uk/pic_tutorial7.htm<br>
 
http://www.winpicprog.co.uk/pic_tutorial7.htm<br>

Latest revision as of 03:00, 25 August 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"

AND Truth table:

Input0 Input1 Output
0 0 0
0 1 0
1 0 0
1 1 1

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