CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
335
Figure 12-6. Operation of UF0BI1 Register (3/3)
(c) Operation example 3
SIE
side
CPU
side
Status of
UF0BI1 register
Transmission
completed
FIFO toggle
FIFO toggle
ACK
reception
Transmission
starts
Transmission
completed
ACK
reception
BKI1NK bit of
UF0EN register
Transfer of Null packet
Short packet transfer
64-byte transfer
FIFO_0
FIFO_1
FIFO_1
FIFO_0
FIFO
clear
Writing
FIFO
starts
Writing
FIFO
completed
BKI1DT
bit of
UF0IS2
register
Hardware clear
INT clear
(FW clear)
BKI1DED bit of
UF0DEND register is set.
BKI1DED bit of
UF0DEND register is set.
FIFO_0
FIFO_1
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