HD64F2168 Datasheet, PDF (856/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

25.7 Usage Notes
It is necessary to connect a bypass capacitor between the VCC pin and VSS pin and a capacitor
between the VCL pin and VSS pin for stable internal step-down power. An example of connection
is shown in figure 25.35.
Vcc power supply
Bypass
capacitor
10 µF
VCC
0.01 µF
VSS
External capacitor
for internal step-down
power stabilization
One 0.1 µF / 0.47 µF or
two in parallel
VCL
VSS
It is recommended that a bypass capacitor be connected to
the VCC pin. (The values are reference values.)
When connecting, place a bypass capacitor near the pin.
Do not connect Vcc power supply to the VCL pin.
Always connect a capacitor for internal step-down power
stabilization.
Use one or two ceramic multilayer capacitor(s)
(0.1 µF / 0.47 µF: connect in parallel when using two)
and place it (them) near the pin.
Figure 25.35 Connection of VCL Capacitor
Rev. 3.00, 03/04, page 816 of 830