Renesas M30245 Series User Manual page 134

M30245 Group
Frequency Synthesizer Prescaler Register
b7 b6 b5 b4 b3
Frequency Synthesizer Multiply Register
b7 b6 b5 b4 b3
Frequency Synthesizer Divide Register
b7 b6 b5 b4 b3
Figure 2.7.4. Frequency synthesizer registers (2)
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
b2 b1 b0
Symbol
FSP
Bit Symbol
FSP
b2 b1 b0
Symbol
FSM
Bit Symbol
FSM
b2 b1 b0
Symbol
FSD
Bit Symbol
FSD
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Address
03DE
16
Bit Name
Frequency synthesizer
prescaler value
Address
03DD
16
Bit Name
Frequency synthesizer
multiplier value
Address
03DF
16
Bit Name
Frequency synthesizer
divider value
2. Frequency synthesizer (PLL)
When reset
11111111
2
Function
Generates f
PIN
f =f(X )/2(n + 1)
PIN IN
n: FSP value
When reset
11111111
2
Function
Generates f by multiplying f
VCO
f = f X 2(n + 1)
VCO PIN
n: FSM value
When reset
11111111
2
Function
Generates f by dividing f
SYN VCO
f =f /2(m + 1)
SYN VCO
m: FSD value
R W
O O
R W
PIN
O O
R W
O O