r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1194

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 24 Clock Pulse Generator
24.5.3
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 24.6.
Figure 24.7 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. 1.00 Sep. 19, 2008 Page 1164 of 1342
REJ09B0467-0100
Notes on Board Design
Note: * CB and CPB are laminated ceramic capacitors.
Figure 24.7 Recommended External Circuitry for PLL Circuit
Prohibited
Figure 24.6 Note on Board Design for Oscillation Circuit
PLLV
C
C
PLLV
L2
L1
V
V
CC
CC
SS
SS
Signal A Signal B
CPB: 0.1 µF *
CB: 0.1 µF *
XTAL
EXTAL
This LSI