HD64F3687GHV Datasheet, PDF (123/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 5 Clock Pulse Generator
PC0/OSC1
L_S
C_S
R_S
C_O
PC1/OSC2/CLKOUT
Figure 5.13 Equivalent Circuit of Crystal Resonator
Table 5.1 Crystal Resonator Parameters
Frequency (MHz)
R_S (Max.)
C_O (Max.)
4
120 Ω
8
80 Ω
10
60 Ω
70 pF
16
50 Ω
20
40 Ω
5.5.2 Connecting Ceramic Resonator
Figure 5.14 shows an example of connecting a ceramic resonator.
PC0/OSC1
PC1/OSC2/CLKOUT
C₁
C₂
C₁ = C₂ = 5 to 30 pF
Figure 5.14 Example of Connection to Ceramic Resonator
5.5.3 Inputting External Clock
To use the external clock, input the external clock on pin OSC1. Figure 5.15 shows an example of
connection. The duty cycle of the external clock signal must range from 45 to 55%.
PC0/OSC1
External clock input
PC1/OSC2/CLKOUT
Open
Figure 5.15 Example of External Clock Input
Rev. 3.00 Sep. 10, 2007 Page 89 of 528
REJ09B0216-0300