David Dolheguy wrote:
> is a delay really required after sending each charater to TXREG?

No, but there has to be a pause SOMEWHERE in general, although it turns o=
ut
that 's' is one of the few characters that would get received correctly
even if there is never a pause.  Let's consider an uppercase 'S' instead,=

character 0x53.  With start & stop bits and sent LSB first, it looks like=

this:
1110010100

If sent continuously with no pauses, you get:
1110010100111001010011100101001110010100...

Now, the receiving end has no way of knowing which of those 0->1
transitions is actually the start bit.  It could just as easily interpret=

this bit stream as either 1010011100 repeated (that's 0x72, 'r') or
1001110010 (0x9C, no idea what that would show up as).  A character-sized=

pause in transmission will guarantee that the following start bit will
actually be interpreted as one, as will a series of characters sent with =
at
least a bit-sized pause after each one.  Once synchronized, the receiving=

end will be able to properly frame the characters with no further pauses
needed, until some interruption in the signal occurs.
        Jason Harper

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body