The capacitor is there to turn the RTS signal into a pulse, so that when the computer brings RTS low, it briefly pulls reset low, and then the pull-up resistor charges the capacitor again, bringing reset high again.
QuoteThe capacitor is there to turn the RTS signal into a pulse, so that when the computer brings RTS low, it briefly pulls reset low, and then the pull-up resistor charges the capacitor again, bringing reset high again.Source : http://www.gammon.com.au/forum/?id=11637Can anyone tell me about this ? I do not understand why it needs so. And is DTR =RTS ? My FTDI programmer are using VCC, RXD, TXD, DTR,CTS and GND pinsThanks !
Why not ? My ftdi programmer have the DTR pins and I am required yo connect it to reset pins via 0.1uF cap..but I do not know why
RTS goes low, as shown here:However we don't want reset to stay low, so the capacitor turns it into a pulse. Then 10K resistor then charges the cap back up and it becomes high, allowing the processor to run.
on this link it shows the reset to reset connected with a cap in between and no mention of DTR CTS etchttp://openmicros.org/index.php/articles/88-ciseco-product-documentation/124-xb4a-how-to-build-arduino-compatiblewhy is that different ??
But the timing has to be right, hold down the reset, select the program from the IDE, when it says loading, count one two three, and release the reset.