Re: Serial programmers?

From: Wim Lewis (wiml_at_hhhh.org)
Date: 03/27/05 

Date: Sun, 27 Mar 2005 04:57:36 +0000 (UTC)

In article <d2549p$sr8$1@domitilla.aioe.org>,
Lessie <lessie__@hotmail.com> wrote:
>I was just wondering how serial programmers work, i.e.
>we need two lines, one for clock, and one for data.
>Which serial line is used to send the clock to the
>device? I assume the data uses RD/TD

Most serial programmers use the serial port as if it were just a
very strange parallel port. The modem control and flow control
lines (DTR, DSR, RTS, CTS, RI, CD) can be set and read individually,
and that's enough bits of I/O there to program something. They might not
even use RxD / TxD.

Another advantage of the serial port is that you can usually draw enough
current from it to power the chip while you're programming it. 

-- 
      Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1
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