AVR-Chat

Jesper Hansen wrote:
>Look at he Cypress SL811HS
>
>It can easily be interface with and AVR, and it's no big deal
>to make the USB Host interface code on the AVR.

Be aware that SL811(H)S requires 8bit uC interface, eliminating the smaller
devices. Also be aware of the timing issues related to A0<-->ALE if this
operation-mode is selected (se SL811HS datasheet for details).
I started a project with this setup, but unfortunately it's been
de-prioritized, and so far I have nothing more than a draft schematic, and
thoughts on the firmware :(

Also, if I understand AT43USB370 correctly, this chip is merely a interface
chip, not a uC with embedded usb interface. AT43USB380 is an upgrade for OTG
and som other new features, like 8/16/32 bits host-interface (-370 supports
32bits host only). The "processor" in the 370/380 - is sram-based, and
requires another system-processor. The other Atmel USB-devices are function
or slave-usb devices only, and OTP based (except for the C51-based chips)...

So, to me it seems the best solution for a 8bit Atmel-based MCU-USB-Host
still includes an external i/f chip, like the SL811HS....

rgds
Øystein Fallo


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