AT43USB320A_04 Datasheet, PDF (99/115 Pages) ATMEL Corporation – Full-speed USB Microcontroller with an Embedded Hub

Selective Suspend,
Embedded Function
Selective Resume,
Embedded Function
AT43USB320A
Hardware
Firmware
1. Set Port Feature PORT_SUSPEND
decoded
2. Disable Port 5’s endpoints
3. Set GPIO to low power state if required
Hardware
6. Send updated port status at next
IN to endpoint1
Firmware
1. Clear Port Feature PORT_SUSPEND
decoded
2. Clear Port 5 suspend status bit
3. Restore GPIO states if required
4. Wait 23 ms, then set enable status bit
and suspend change bit
5. Enable Port 5 endpoints
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1443E–USB–4/04