HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 139

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

3.2.7
When Using an External Crystal Oscillator: Place the crystal resonator, capacitors CL1 and
CL2, and damping resistor R close to the EXTAL and XTAL pins. To prevent induction from
interfering with correct oscillation, use a common grounding point for the capacitors connected to
the resonator, and do not locate a wiring pattern near these components.
Bypass Capacitors: As far as possible, insert a laminated ceramic capacitor of 0.01 to 0.1 µF as a
bypass capacitor for each V
power supply pins, and use components with a frequency characteristic suitable for the LSI
operating frequency, as well as a suitable capacitance value.
V
PLL system: 9-12
3 V digital system: 20-18, 26-22, 35-33, 45-42, 52-50, 60-58, 61-67, 69-66, 78-76, 79-81, 91-89,
5 V digital system: 157-155, 169-167, 181-179, 191-193, 202-200
Note: The values for CL1, CL2, and the damping resistance should be determined after
SS
/V
CC
consultation with the crystal resonator manufacturer.
pairs
Notes on Board Design
Figure 3.5 Points for Attention when Using Crystal Resonator
101-99, 112-109, 113-110, 114-116, 130-132, 149-146, 150-147
SS
/V
CC
EXTAL
Avoid crossing
signal lines
pair. Mount the bypass capacitors as close as possible to the LSI
CL1
CL2
XTAL
R
121