DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 552

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

14.5.2
(1) USB Cable Connection (When USB module stop or power-down mode is not used)
Rev.7.00 Dec. 24, 2008 Page 498 of 698
REJ09B0074-0700
If the USB cable enters the connection state from the disconnection state in an application (self
powered) where USB module stop or power-down mode is not used, perform the operation as
shown in figure 14.3. In bus-powered mode, perform the operation according to note 2 in
figure 14.3.
from 14.5.1
Notes: 1. VBUS interrupts in the USB module cannot be detected in power-down mode or
USB Cable Connection/Disconnection
Receive bus reset from the host
2. In bus-powered mode, power is applied after the USB cable has been connected.
Set USB module operation
powered mode initialization
Bus reset interrupt occurs.
A VBUS interrupt occurs
After completing the bus-
in the USB module stop state.
Accordingly, immediately after completing the power-on reset, initialization (14.5.1), clearing all FIFOs,
and system preparation, enable the D+ pull-up by the port 36 (P36) and cancel the UDC core reset state.
Connect the USB cable
(When USB Module Stop or Power-Down Mode Is not Used)
USB function
Figure 14.3 USB Cable Connection
*
*
1
2
EXIRQx
EXIRQx
(Clear UDCRST in UCTLR to 0)
Wait for a setup interrupt
Cancel UDC core reset
Check if VBUSs in UIFR3
Initialize the firmware
Clear VBUSi in UIFR3
Enable D+ pull-up
System ready?
Clear all FIFOs
by port 36 (P36)
Firmware
Yes
is set to 1
No
Check the USB cable
connection state