Datasheet

Table Of Contents
Section 21 Clock Pulse Generator
Page 672 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
XTAL
C
L
AT-cut parallel-resonance type
EXTAL
C
0
LR
s
Figure 21.3 Crystal Resonator Equivalent Circuit
Table 21.3 Crystal Resonator Characteristics
Frequency (MHz) 13 16 24*
R
S
max (Ω) 60 50 40
C
0
max (pF) 7 7
Note: * Available only in H8S/2215R and H8S/2215C.
21.2.2 Connecting a Ceramic Resonator (H8S/2215T)
Figure 21.6 shows an example wiring diagram for connecting a ceramic resonator.
EXTAL
XTAL
R
d
R
f
Ceramic resonator
16 MHz: CSTCEV13L**
24 MHz: CSTCWX11***
Ta = 0 to 70 °C
Contact your Renesas Electronics sales agency
for details of Rf and Rd values.
Ceramic
Resonator
Note: *** represents three-digit alphanumerics which express "Individual Specification".
Since the frequency for USB requires high accuracy, the official product type name will be defined
after the performance of the user's board on which the resonator is mounted is evaluated and its
frequency is adjusted.
Please contact your Renesas Electronics sales agency.
Figure 21.4 Example Wiring Diagram for Connecting a Ceramic Resonator
21.2.3 Inputting an External Clock
An external clock signal can be input as shown in an example in figure 21.5. If the XTAL pin is
left open, make sure that stray capacitance is no more than 10 pF. When complementary clock
input to XTAL pin, the external clock input should be fixed high in standby mode.