CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
Preliminary User’s Manual U19014EJ1V0UD
330
Figure 12-5. Operation of UF0BO1 Register (2/2)
(b) Operation example 2
SIE side
CPU side
Status of
UF0BO1 register
Reception
completed
Reception
starts
Null
reception
completed
Null
reception
completed
FIFO
toggle
FIFO
toggle
ACK
transmission
Reception
starts
Reception
completed
ACK
transmission
BKO1NL bit of
UF0IS3 register
BKOUT1
bit of
UF0EPS0
register
BKO1DT
bit of
UF0IS3
register
Transfer of data
less than 64 bytes
0-byte
transfer
0-byte
transfer
64-byte transfer
64-byte transfer
FIFO_0
FIFO_1
FIFO_1
FIFO_0
Reading
FIFO
starts
Reading
FIFO
completed
FW clear
FW clear
FIFO_0
FIFO_1
electronic components distributor