Difference between revisions of "Minimig Shared RS232"
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(rs232 fix) |
(table fix) |
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| (2 intermediate revisions by the same user not shown) | |||
| Line 4: | Line 4: | ||
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 | + | :{| class="wikitable" |
| − | + | |- | |
| − | + | ! Input0 !! Input1 !! Output | |
| − | + | |- | |
| + | | 0 || 0 || 0 | ||
| + | |- | ||
| + | | 0 || 1 || 0 | ||
| + | |- | ||
| + | | 1 || 0 || 0 | ||
| + | |- | ||
| + | | 1 || 1 || 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> |
Latest revision as of 04:00, 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
