
243
Chapter 6
Clock Generator
User’s Manual U16702EE3V2UD00
6.4 PLL
Function
The PLL function is used to output the operating clock of the CPU and peripheral macro at a frequency
10 times (PLL1) / 12 times (PLL0) higher than the oscillation frequency, and selects the clock-through
mode.
•
When PLL function is used:
Input clock:
4 to 8 MHz
Output:
4 to 40 MHz (µPD70F3403 and µPD70F3403A)
4 to 32 MHz (µPD70F3402)
•
Clock-through mode:
Input clock:
4 to 8 MHz
Output:
4 to 8 MHz
PLL0 can generate below frequencies from f
X
signal and register setting:
Note:
Set the f
PLL0
as 24 MHz or 32 MHz when f
PLL0
is used as CPU clock.
Base clock (f
X
)
OCKS0 register
divide value
PLL0 Time
value
CKC Register
divide value
PLL0 Output
(f
PLL0
)
Note
f
X
1
12
1
f
PLL0
= f
X
×
12
2
f
PLL0
= f
X
×
6
4
f
PLL0
= f
X
×
3
2
1
f
PLL0
= f
X
×
6
2
f
PLL0
= f
X
×
3
4
f
PLL0
= f
X
×
1.5
3
1
f
PLL0
= f
X
×
4
2
f
PLL0
= f
X
×
2
4
f
PLL0
= f
X
×
1
4
1
f
PLL0
= f
X
×
3
2
f
PLL0
= f
X
×
1.5
4
f
PLL0
= f
X
×
0.75
5
1
f
PLL0
= f
X
×
2.4
2
f
PLL0
= f
X
×
1.2
4
f
PLL0
= f
X
×
0.6
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