HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 128

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

3.2.3
Connecting a Crystal Resonator: Figure 3.2 shows an example of crystal resonator connection.
The values of damping resistance R and load capacitances CL1 and CL2 should be decided after
investigating the components in collaboration with the manufacturer of the crystal oscillator to be
used. The crystal resonator should be an AT-cut parallel-oscillator type. Place the crystal resonator
and its load capacitors as close as possible to the XTAL and EXTAL pins.
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation.
110
Notes: 1. The CKIO pin is an output in clock modes 0,1, and 2. In mode 3, it is high impedance.
2. The values for CL1, CL2, and the damping resistance should be determined after
Connecting a Crystal Resonator
consultation with the crystal resonator manufacturer.
CKPREQ/CKM
Figure 3.2 Example of Crystal Oscillator Connection
EXTAL
XTAL
CKIO
R
Output or high
impedance
High level
CL1
CL2