Renesas M16C Series User Manual page 132

M30245 Group
Frequency Synthesizer Prescaler Register
b7 b6
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Frequency Synthesizer Multiply Register
b7 b6
Frequency Synthesizer Divide Register
b7 b6
Figure 2.7.4. Frequency synthesizer registers (2)
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
b5 b4 b3 b2 b1 b0
Symbol
FSP
Bit Symbol
FSP
b5 b4 b3 b2 b1 b0
Symbol
FSM
Bit Symbol
FSM
b5 b4 b3 b2 b1 b0
Symbol
FSD
Bit Symbol
FSD
page 123 of 354
Address
03DE
16
Bit Name
Frequency synthesizer
prescaler value
Address
03DD
16
Bit Name
Frequency synthesizer Generates f
multiplier value
Address
03DF
16
Bit Name
Frequency synthesizer Generates f
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
by multiplying f
VCO PIN
f = f X 2(n + 1)
VCO PIN
n: FSM value
When reset
11111111
2
Function
by dividing f
SYN VCO
f =f /2(m + 1)
SYN VCO
m: FSD value
R W
O O
R W
O O
R W
O O