Rev. 3.0, 10/02, page 602 of 686
21.6
USB Operating Clock
USB operating clock can be supplied by connecting a ceramic resonator, or by input of an external
clock.
21.6.1
Connecting a Ceramic Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
21.6. Select the damping resistance Rd according to table 21.2. An AT-cut parallel-resonance
crystal should be used.
EXTAL48
XTAL48
R
d
R
f
Ceramic resonator: CSTCW48M0X11
-R
(Murata Manufacturing Co.,Ltd.)
Ceramic
Resonator
***
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 fre-
quency is adjusted.
Please contact your Hitachi sales agency.
Ta = 0 to 70 C
Contact the representative mentioned below for details of Rf and Rd values.
Figure 21.6 Connection of Ceramic Resonator
21.6.2
Inputting an 48-MHz External Clock
An external clock signal can be input as shown in an example in figure 21.7. The XTAL48 pin
must be left open.
EXTAL48
XTAL48
External clock input
Open state
Figure 21.7 Connection of Ceramic Resonator
Table 21.5 shows the input conditions for the 48-MHz external clock.
Summary of Contents for H8S/2215 Series
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