HD6432670 Hitachi, HD6432670 Datasheet - Page 830

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

21.5.3
When using the crystal resonator, 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
oscillation circuit to prevent induction from interfering with correct oscillation. See figure 21.6.
Figure 21.7 shows the external circuitry recommended for the PLL circuit. Separate PLLVcc and
PLLVss from the other Vcc and Vss lines at the board power supply source, and be sure to insert
bypass capacitors CPB and CB close to the pins.
Rev. 2.0, 04/02, page 784 of 906
Notes on Board Design
Note: * CB and CPB are laminated ceramic capacitors.
Figure 21.7 Recommended External Circuitry for PLL Circuit
Figure 21.6 Note on Board Design for Oscillation Circuit
Avoid
C
C
L2
L1
PLLV
PLLV
V
V
CC
CC
SS
SS
Signal A Signal B
Rp: 200
CPB: 0.1 µF *
CB: 0.1 µF *
XTAL
EXTAL
This LSI