Date: Fri, 28 Mar 1997 09:54:35 -0700 From: Steve Passe <smp@csn.net> To: Richard Tobin <richard@cogsci.ed.ac.uk> Cc: multimedia@freebsd.org Subject: Re: Tuner AFC Message-ID: <199703281654.JAA25681@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Fri, 28 Mar 1997 13:05:41 GMT." <27629.199703281305@pitcairn.cogsci.ed.ac.uk>
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Hi,
> It turns out that some of the channels here aren't on precisely the
> official frequencies, so I wrote a program to do AFC.
>
> The AFC works using the 3 bottom bits of the tuner status register.
> When it's centred, they are 0 1 0. 1 0 0 means it's too low, 0 0 1
> too high. The TEMIC datasheet refers to a 5-level ADC suggesting
> that it might return 1 1 0 or 0 1 1 but that doesn't seem to happen
> for me.
according to the philips datasheet for the TSA5522 (ie the PLL being addresses)
the legal values are 0 thru 4.
according to the philips datasheet for the tuners it breaks down like this:
Frequency (kHz): Value (binary):
-125.0 000
-62.5 001
0.0 010
+62.5 011
+125.0 100
--
Steve Passe | powered by
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