SH7720 Datasheet, PDF (899/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

25.4 Operation
25.4.1 Cable Connection
Section 25 USB Function Controller (USBF)
USB function
Cable disconnected
VBUS pin = 0 V
UDC core reset
USB cable connection
Application
Enable VBUS pin by
pin function controller
Set USB operation clock
USB module stop release
Write 50-byte endpoint
information to EPIR
USB module interrupt
setting
No
USB1_pwr_en = 1?
Yes
IFR0/VBUSF = 1,VBUSMN= 1
USB bus connection or
disconnection detection interrupt
Interrupt request
As soon as preparations are
completed, enable D+ pull-up
by USB1_pwr_en pin
Clear VBUS flag
(IFR0/VBUSF)
UDC core reset release
Firmware preparations for
start of USB communication
IFR0/CFDN = 1
Endpoint information
load complete interrupt
Bus reset reception
IFR0/BRST = 1
Bus reset interrupt
Interrupt request
Clear bus reset flag
(IFR0/BRST)
Wait for setup command
reception complete interrupt
Clear FIFOs
Initial
settings
Wait for setup command
reception complete interrupt
Figure 25.3 Cable Connection Operation
Rev. 3.00 Jan. 18, 2008 Page 837 of 1458
REJ09B0033-0300