DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 551

• 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
14.5.1
The USB must be initialized as described in the flowchart in figure 14.2.
USB operating clock stabilization
Note:
Start USB operationg clock
detection interrupt occurs.
USB interface operation OK
Cancel power-on reset
Communication Operation
Initialization
stabilization time has
*
Set each interrupt
operating clock
Before entering power-down mode, set USB module stop 2 by setting the MSTPB0 bit in MSTPCRB to 1.
oscillation.
passed?
USB function
USB
Yes
No
Figure 14.2 USB Initialization
EXIRQ0
connecting procedure
To USB cable
(Bus powered)
Rev.7.00 Dec. 24, 2008 Page 497 of 698
Firmware
To 14.5.2 (1)
No
(Write to 1 MSTPB0 in MSTPCRB)
Clear CK48READY in UIFR3 to 0
(Clear UIFRST in UCTLR to 0)
(Write 1 to UCKS3 to UCKS0
Cancel USB module stop 1
Cancel USB module stop 2
Cancel USB interface reset
Select USB operating clock
Wait for USB operating
Enter power-down mode
(Clear USBSTP1 in
Wait for USB cable
(Clear MSTPB0 in
USB module stop 2
clock stabilization
EXMDLSTP to 0)
MSTPCRB to 0)
Set each interrupt
enter power-down
System needs to
Self powered?
(If necessary)
Yes
connection
in UCTLR)
Yes
mode?
REJ09B0074-0700
(Self powered)
No
*
*