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M30245 Group
When using f
b7
0
0
0
USB clock enabled
b7
1
Selecting ATTACH/DETACH
b7
0
0
0
USB block enabled (Note)
b7
1
1
Note: After the USB block is enabled (USBC7 set to "1"), a minimum delay of 187.5ns is needed
before performing any other USB register read/write operations.
Figure 2.8.18. Initialization procedure of frequency synthesizer and USB function control unit (2)
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Continued from the previous page
as a main clock
SYN
b0
Frequency synthesizer clock control register [Address 03DB
1
0
0
0
FSCCR
Clock source selection bit
1 : f
SYN
Divide-by-3 option
0 : Normal
1 : Divide-by-3 (Note)
b0
USB control register [Address 000C
0
0
0
0
0
USBC
USB clock enable bit
1 : Enable (Supply 48MHZ clock)
•When selecting ATTACH function: Set "03
•When ATTACH function disabled: Set "00
b0
USB Attach/Detach register [Address 001F
0
0
USBAD
Port 9
-Second
0
0 : Normal mode for Port 90
1 : Forces Port 9
Attach/Detach
0 : Detach
1 : Attach
Reserved bit
USB control register [Address 000C
b0
0
0
0
0
0
USBC
USB enable bit
1 : USB blobk enabled
page 146 of 354
Note: When this bit is "1", set FSD to "02
]
16
]
16
to operate as pull up for D+.
0
]
16
2. USB function
]
16
".
16
"
16
"
16
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