Ohhh yeah!I'm actually having lunch with the Atmel regional guys tomorrow; I'll ask about the '1284.
'soft' power
Re: 'soft' power
Re: 'soft' power
one question about soft power: obviously the uc can go to sleep for minimal power use, but from cursory observation it seems like the ad72x needs the CE pin pull down to go to sleep. does the '723 completely sleep when there is no impedence on the video line? the 725 doesnt so perhaps we can set up another pin for that....
Re: 'soft' power
Yeah, you'd need to control CE for maximum benefit. I was only marginally coming at it from a power perspective-- more just a UI angle. (people like to turn things off and on)ladyada wrote:one question about soft power: obviously the uc can go to sleep for minimal power use, but from cursory observation it seems like the ad72x needs the CE pin pull down to go to sleep. does the '723 completely sleep when there is no impedence on the video line? the 725 doesnt so perhaps we can set up another pin for that....
We ended up with an IO for a "power" button and an IO for an LED. Those could also serve multiple purposes (such as starting a firmware upgrade from a bootloader, etc) a little easier than a hardwired solution.
Uze and I have been trying to leave as many GPIO's "undedicated" as possible for people to use for their own projects.
I kinda figure that the power getting wasted in the wall-wart and/or LDO stage kinda makes the power into the actual Uzebox look like rounding error. I'm using the '723 which has a load detect, so it's only driving the Svideo/Composite if there's a load on the other end. We'd get a psuedo-shutdown by just gating off the colorburst clock and not driving the RGB too, so I didn't want to eat a GPIO for the CE. I guess I could add a resistor for a stuffing option if I can find a couple square millimeters on the PCB.
-Clay