Data Sheet

814
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
31.8.5.5 Host Frame Length Register
Name:
FLENHIGH
Offset: 0x12
Reset: 0x0000
Property: Read-Only
z Bits 7:0 – FLENHIGH: Frame Length
These bits contains the 8 high-order bits of the internal frame counter.
Table 31-22. Counter description versus speed
Bit76543210
FLENHIGH[7:0]
AccessRRRRRRRR
Reset00000000
Table 31-23. Counter Description vs. Speed
Host Register
STATUS.SPEED
Description
Full Speed
With a USB clock running at 12MHz, counter length is 12000 to ensure a SOF
generation every 1 ms