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