Renesas V850E2 Bedienungsanleitung Seite 26

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26
R01DS0139ED0100
Data Sheet
Chapter 4 Clock generators
Chapter 4 Clock generators
4.1 CPU clock
Table 4-1 CPU clock frequency
4.2 Peripheral clock
Table 4-2 Peripheral clock frequency
4.3 Oscillator characteristics
4.3.1 Main oscillator
A ceramic or crystal resonator can be connected to the main clock input pins
as shown in figure 4-1 “Recommended Main Oscillator Circuit”
.
Figure 4-1 Recommended Main Oscillator Circuit
Caution Values of C
1
, C
2
and R
d
and the best setting for MOSCC.AMPSEL[1:0]
register depend on the used ceramic or crystal resonator and must be
specified in cooperation with ceramic or crystal resonator manufacturer.
Parameter Symbol Condition
Ratings
Unit
Min Typ Max
CPU clock frequency fCPU
PLL based - - 80 MHz
SSCG based - - 88.32 MHz
Parameter Symbol Condition
Ratings
Unit
Min Typ Max
Peripheral clock
frequency
fPERI - - 48
a
a)
Some peripherals can be operated at 80MHz. Refer to the chapter ‘Clock Selection’ in the UM for
details.
MHz
X1 X2
C
1
C
2
R
d
internal
external
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