About rs232 on motorola mpc8260 ads board
Quoted 27 lines
----- Original Message -----
From: zzh <[email protected]>
To: <[email protected]>
Sent: Wednesday, March 22, 2000 4:28 PM
Subject: About rs232 on motorola mpc8260 ads boardQuoted 18 lines
Hello,everyone.
I'm trying to make the SCC1 drived rs232 port of a motorola mpc8260 ads board work.The manual says it can direct connect to pc com port.But it seems the output from this board is not rs232 voltage.i.e -3 to -12 for logical one,3 to 12 for logical zero,nor is it TTL,it seems that it use 0 for logical 1,5.0v for logical 0,so it is rather annoying. I have to invert the output from 8260 ads,then use a TTL->232 converter to connect with PC, it works when i send char from 8260,but cannot work in the other direction.
In addition,for a while,it output 232 signal,but i cannot reproduce it!!
Does anyone has experience with this board?
Thanks for your advice.davidzhang 3/22/2000
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������--�й��˵����ϼ� http://www.263.net
@263.net�й����������ʾ� http://freemail.263.netPavel Roskin is right , that means to check RTS(from ads) or enable it manually.
Have you hack with this board?today i check the manual,find that it has SCC1 RTS connect to rs232 CTS pin (pin 8),the init8260 program from motorola did not init this pin(PD29).Should i program this pin? How should i make the pin connection.For now,i connect DSR with DTR, Tx with PC Rx,Rx with PC tx.Most amazing to me is that when i measure the output wave from Tx pin,it is 0-5V.what it looks like when i output a 'c' (0x63 which is 01100011) is as below:
start 11 000 11 0 (lsbit to msbit)
5v --- --------- ---
0v -- ------ ------
All will be right if 0v is -3 to -12 and 5v is 3 to 12 What wrong with this?
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b.r.
john zhan.
hacking time.
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������--�й��˵����ϼ� http://www.263.net
@263.net�й����������ʾ� http://freemail.263.net
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