Re: UART

From: Grant Edwards <grante@xxxxxxxx>
Date: Thu, 27 Apr 2006 19:02:29 -0000

On 2006-04-27, Kurt Harders <news@xxxxxxxxxxxxxxx> wrote:

How does the UART know that the device connected to it is
ready to receive data?

It depends on the UART. Some don't know anything. Some watch
the handshake lines. Some watch for xon/xoff characters.

It does not know anything about the connected device. The
driver may look at the handshake lines (DTR, RTS, CTS...) but
thats not part of the UART.

That depends on the UART. The better UARTs do indeed look at
CTS and/or DSR, and some even monitor the receive datastream
for xon/xoff characters.

--
Grant Edwards grante Yow! I OWN six pink
at HIPPOS!!
visi.com
.

References:
- UART
  - From: lee
- Re: UART
  - From: Kurt Harders

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