CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
369
Figure 12-19. CPUDEC Request for Control Transfer (5/12)
(b) Control transfer (read) (3/4)
I
J
No transmit data?
E0INDT = 1 (UF0IS1)
EP0NKW = 0 (UF0E0N)
E0INDTC = 0
(UF0IC1)
STG = 1
(UF0IS1)
Yes
Yes
No
H
INTUSB0B
active
Reading UF0ISn register
E0INDT = 1?
(UF0IS1)
No
Yes
Data of Null packet received?
No
Illegal processing
Remarks 1.
n = 0, 1
2.
♦
: Processing by hardware
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