Im implementing an UART for a 21161n DSP as its shown on the EE-191 Analog
Devices document.
http://www.analog.com/UploadedFiles/Application_Notes/399447663EE191.pdf
According to the schematic two flag pins can be optionally connected to manage
the CTS and RTS control signals.
Could anybody explain me where may I connect them (what FLAGx and FLAGy are?)
and whats their utility?
Thanks,
Hori
uart with 21161n
Started by ●July 14, 2006
Reply by ●July 14, 20062006-07-14
On Fri, 14 Jul 2006 h...@yahoo.fr wrote:
> Im implementing an UART for a 21161n DSP as its shown on the EE-191 Analog Devices document.
>
> http://www.analog.com/UploadedFiles/Application_Notes/399447663EE191.pdf
>
> According to the schematic two flag pins can be optionally connected to manage the CTS and RTS control signals.
>
> Could anybody explain me where may I connect them (what FLAGx and FLAGy are?) and whats their utility?
Any flag pins will work, so pick the most convienient. CTS is input, RTS
is output. When CTS is low, stop sending data, when CTS is high you can
send. Pull RTS low when you want the other side to stop sending you data.
A search on RS232 protocol will explain it.
Note that "low" and "high" are logic not voltage level. Life can get
really confusing because the full standard is based on +/- 10V signals
and lots of logic translators call -10V = +TTL and +10V = GND. But not
all of them :-) Good luck!
Patience, persistence, truth,
Dr. mike
> Im implementing an UART for a 21161n DSP as its shown on the EE-191 Analog Devices document.
>
> http://www.analog.com/UploadedFiles/Application_Notes/399447663EE191.pdf
>
> According to the schematic two flag pins can be optionally connected to manage the CTS and RTS control signals.
>
> Could anybody explain me where may I connect them (what FLAGx and FLAGy are?) and whats their utility?
Any flag pins will work, so pick the most convienient. CTS is input, RTS
is output. When CTS is low, stop sending data, when CTS is high you can
send. Pull RTS low when you want the other side to stop sending you data.
A search on RS232 protocol will explain it.
Note that "low" and "high" are logic not voltage level. Life can get
really confusing because the full standard is based on +/- 10V signals
and lots of logic translators call -10V = +TTL and +10V = GND. But not
all of them :-) Good luck!
Patience, persistence, truth,
Dr. mike