PD70F3461_15 Datasheet, PDF (16/63 Pages) Renesas Technology Corp – V850E/CAG4-M 32-Bit Single-Chip Microcontroller

2. Electrical Specification : Device Clock Specifications
2.1 Main Oscillator Characteristics
Ta =-40 to +105°C
V_DD5X = 4.5 to 5.5V
V_DD3x = AV_DD = BV_DD3x = MV_DD3x = 3.0 to 3.6V
V_SS5X = V_SS3x = AV_SS = BV_SS5X = BV_SS3X = MV_SS3X = 0V
X1
X2
R
µPD70F3461
C₁
C₂
Figure 2-1: Main Oscillator Recommendations
Remark: Values of capacitors C₁, C₂ and the resistor R depend on used crystal and must be speci-
fied in cooperation with the manufacturer.
Cautions: 1.
2.
External clock input is prohibited.
Wire as follows in the area enclosed by the broken lines in the above figure to
avoid an adverse effect from wiring capacitance.
• Place the oscillation circuit as close as possible to X1 and X2 pins.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating cur-
rent flows.
• Always make the ground point of the oscillator capacitor the same potential as
CVSS.
• Do not ground the capacitor to a ground pattern through which a high current
flows.
• Do not fetch signals from the oscillator.
Table 2-1: Main Oscillator Operating Conditions
Parameter
Symbol
Conditions
Oscillation frequency
fOSC
Oscillation stabilization time ^b
TOST
OSC MODE
a. With any other frequency Peripheral function can’t be guaranteed
b. T_OST depends on the external crystal
MIN. TYP. MAX. Unit
16^a
MHz
10
ms
Note: Please specify the oscillation stabilization time of the main oscillator T_OST with the manufacturer
of the external quartz crystal.
Datasheet U18578EE1V0DS00
16