[sdiy] MSP430?

[Jaroslaw Ziembicki]

----- Original Message -----
From: "ASSI" <Stromeko at compuserve.de>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, November 23, 2003 6:09 PM
Subject: Re: [sdiy] MSP430?


> On a side-note, it is not a RISC, no matter what marketing would want
> you to believe.

OK, it's my mistake, I think I should name it "orthogonal architecture".

> Why would I absolutely need the second quartz for MIDI applications?

Of course, you need only one crystal, but it should have a frequency of
some MHz (which can be divided in the UART to get 31.25kbaud).
The standard crystal oscillator in the MSP430 family is 32.768kHz.
There were (or maybe still are) µC types with a Frequency Locked Loop
inside that produced an exact high frequency clock from that 32.768kHz.
But the types I know have just an additional RC oscillator and/or an
additional high speed crystal oscillator.
In my project, I drive the timers and the UART from 32.768kHz (the baud
rate is as low as 600 baud). The CPU is clocked from the RC oscillator
(3..6 MHz, depending on temperature and supply voltage).

Regards,
Jarek