13 Aug
2007
13 Aug
'07
12:33 p.m.
On 13 Aug 2007 at 8:10, dwight elvey wrote:
For async you should be using
X16 and the correct divide settings for x16. 1X is only for sync com.
You need to compensate the divide when doing X16. It is different
than 1X.
On the 2661/68661, if the internal clock is selected, the implied
divisor is 16x, regardless of whatever divisor you may specify in the
mode words. AFAIK, when the internal clock is specified, pins 9 and
25 turn into outputs.
I've used a 2661 with an external clock in async mode, and there the
divisor (1x, 16x, 64x) matters. But the 1x rate is a bastardized
thing that doesn't really accommodate much speed variation between
sender and receiver, unless the sender's also supplying the clock
(similar to sync mode). For general-purpose async use, it's best
left out of the picture.
Cheers,
Chuck