HD64F2638F20J Datasheet, PDF (958/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 22A Clock Pulse Generator
(H8S/2636 Group, H8S/2638 Group, H8S/2630 Group)
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
External circuitry such as that shown below is recommended around the PLL.
PLLCAP
R1: 3 kΩ
C1: 470 pF
PLLVSS
VCC
VSS
CB: 0.1 μF*
(Values are preliminary recommended values.)
Note: * CB is laminated ceramic capacitors.
Figure 22A-5 Points for Attention when Using PLL Oscillation Circuit
Place oscillation stabilization capacitor C1 and resistor R1 close to the PLLCAP pin, and ensure
that no other signal lines cross this line. Supply the C1 ground from PLLVSS.
Separate PLLVSS from the other VCC and VSS lines at the board power supply source, and be
sure to insert bypass capacitors CB close to the pins.
Page 908 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010