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Figure 2.8.17. Initialization procedure of frequency synthesizer and USB function control unit (1)
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Clearing the protect
b7
b0
Protect register [Address 000A
0
0
1
PRCR
Enable bit for writing to system clock control registers 0 and 1
and frequency synthesizer related registers
1 : Write-enabled
Enable bit for writing to processor mode registers 0 and 1
0 : Write-inhibited
Reserved bit
Setting frequency synthesizer related registers
b7
b0
Frequency synthesizer prescaler
FSP [Address 03DE
00
16
b7
b0
Frequency synthesizer multiplier
FSM [Address 03DD
00
to FF
16
Setting frequency synthesizer control register
b7
b0
Frequency synthesizer control register [Address 03DC
1
1
0
0
0
0
0
FSC
Frequency Synthesizer enable bit
1 : Enabled
VCO gain control bit
b2 b1
0 0 : Lowest gain
0 1 : Low gain
1 0 : High gain (Recommended)
1 1 : Highest gain
Reserved bit
LPF current control bit (Note)
b6 b5
0 0 : Disabled
0 1 : Low current
1 0 : Medium current (Recommended)
1 1 : High current
Setting the protect
b7
b0
Protect register [Address 000A
0
0
0
PRCR
Enable bit for writing to system clock control registers 0 and 1
and frequency synthesizer related registers
0 : Write-inhibited
Enable bit for writing to processor mode registers 0 and 1
0 : Write-inhibited
Reserved bit
Checking the frequency synthesizer locked status bit
It is necessary to recheck after a wait of 0.1ms if it is "0".
b7
b0
Frequency synthesizer control register [Address 03DC
1
0
0
FSC
Frequency synthesizer lock status bit
0 : Unlocked
1 : Locked (Frequency synthesizer stabilized)
page 145 of 354
Initialization of USB FCU
]
16
]
16
to FF
can be set
16
b7
]
16
can be set
16
Note: If the time for locking frequency synthesizer
is needed, first, set to "11
and set to "10
after it locked.
]
16
Wait for 3ms
Continued to the next page
2. USB function
Frequency synthesizer
b0
divider
FSD [Address 03DF
]
16
00
to FF
can be set
16
16
]
16
" (High current),
2
" (Medium current)
2
]
16
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