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CHAPTER 12 USB HOST
12.5 Operation of USB HOST
Figure 12.5-12 Resume Operation by Device (Full Speed Mode)
(2) The simple host pins D+ and D- are detected to be K State.
Pin D+ for HOST
Pin D- for HOST
RWIRQ bit of HIRQ
(RWKIRE=1)
: Power output from USB HOST
: Power output from device
: Drive by resistances of pull-up and pull-down
∗: This value is not guaranteed.
(3) The device is detected being cut.
Pin D+ for HOST
Pin D- for HOST
RWKIRQ bit of HIRQ
(RWKIRE=1)
HIRQ bit1
(DIRE=1)
CSTAT bit of HSTATE
: Drive by resistances of pull-up and pull-down
284
Discovers that HOST pin D + and HOST pin D - become K State.
Figure 12.5-13 Resume Operation by Device Cutoff
The device is detected being cut.
Cutting
FUJITSU MICROELECTRONICS LIMITED
20μs ∗
2.5μs or more
MB90335 Series
1.33μs ∗
1 bit time
Interrupt
occurs
CM44-10137-6E
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