CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
329
Figure 12-5. Operation of UF0BO1 Register (1/2)
(a) Operation example 1
SIE side
CPU side
Status of
UF0BO1 register
Reception
completed
FIFO toggle
FIFO toggle
ACK
transmission
Reception
starts
Reception
completed
ACK
transmission
BKO1NK bit of
UF0EN register
BKO1FL
bit of
UF0IS3
register
BKOUT1
bit of
UF0EPS0
register
BKO1DT
bit of
UF0IS3
register
Transfer of data less
than 64 bytes
64-byte transfer
64-byte transfer
FIFO_0
FIFO_1
FIFO_1
FIFO_0
Reading
FIFO
starts
Reading
FIFO
completed
Reading
FIFO
starts
Reading
FIFO
completed
F
W clear
FIFO_0
FIFO_1
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