CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
367
Figure 12-19. CPUDEC Request for Control Transfer (3/12)
(b) Control transfer (read) (1/4)
IN token received?
E0IN = 1?
(UF0IS1)
Transmitting NAK
E0IN = 1
(UF0IS1)
Writing UF0E0W register
E0INM = 1
(UF0IM1)
Yes
No
Yes
No
B
If return data greater than the FIFO size exists,
it is divided into FIFO size units and sequentially
written, starting from the lowest data byte.
INTUSB0B
active
Reading UF0ISn register
I
F
Illegal processing
Remarks 1.
n = 0, 1
2.
♦
: Processing by hardware
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