CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
334
Figure 12-6. Operation of UF0BI1 Register (2/3)
(b) Operation example 2
SIE
side
CPU
side
Status of
UF0BI1 register
Transmission
completed
FIFO toggle
ACK
reception
Transmission
starts
Transmission
completed
ACK
reception
Re-
transmission
starts
ACK cannot
be received
BKI1NK bit of
UF0EN register
64-byte transfer
Re-transfer
64-byte transfer
FIFO_0
FIFO_1
FIFO_1
FIFO_0
Writing
FIFO
starts
Writing
FIFO
completed
Writing
FIFO
starts
Writing
FIFO
completed
BKI1DT
bit of
UF0IS2
register
Hardware clear
INT clear
(FW clear)
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