Re: Linux x uClinux for ColdFires: what is the best for what?

David Brown wrote:
> It was pwm timer outputs.  On the MCF5213, you can configure the pwm 
> outputs as 8 8-bit pwm timers, or 4 16-bit pwm timers (it was a while 
> ago that I worked on that project, so the details are hazy - and of 
> course, I could have misread the datasheet at the time).  It turned 
> out that although you could set up 8 pwm timers, only four were 
> connected to pins.

Oh, yeah. The PWM module consists of eight 8-bit channels, pairs of 
which can be concatenated to get up to four 16-bit channels.

On the smaller MCF5211/2/3 packages, the four 16-bit channels (1, 3, 5, 
and 7) are the ones multiplexed with the 16-bit timer channels.  They 
are also bonded to dedicated pins on the bigger packages (81-ball MAPBGA 
and 100-pin LQFP).

The four even-numbered channels (0, 2, 4, and 6) are only available 
muxed with the 32-bit timer channels.  In retrospect, they could've been 
muxed elsewhere, but we worked on the premise that most people would 
want a mix of 16- and 32-bit timers and PWMs, and that the 8-bit only 
channels were unlikely to be used too often.  You must be using the 
whole batch of timers and, therefore, had no way to use any of the 
dedicated 8-bit channels...

John

-- 
POPI Classification
[x]General Business Information
[ ]Freescale Internal Use 
[ ]Freescale Confidential Proprietary

---
[email protected]              Send a post to the list.
[email protected]        Join the list.
[email protected]    Join the list in digest mode.
[email protected]     Leave the list.