Datasheet
82
XTAL
EXTAL
C
L1
C
L2
R
d
4–10 MHz
C
L1
= C
L2
= 18–22 pF (Recommended value)
Figure 4.2 Connection of the Crystal Oscillator (Example)
Table 4.1 Damping Resistance Values (Recommended Values)
Frequency (MHz)
Parameter 4 8 10
Rd (Ω) 500 200 0
Crystal Oscillator: Figure 4.3 shows an equivalent circuit of the crystal oscillator. Use a crystal
oscillator with the characteristics listed in table 4.2.
Co
EXTAL
C
L
LRs
XTAL
Figure 4.3 Crystal Oscillator Equivalent Circuit
Table 4.2 Crystal Oscillator Parameters
Frequency (MHz)
Parameter 4 8 10
Rs max (Ω) 120 80 60
Co max (pF) 7 7 7
4.2.2 External Clock Input Method
Figure 4.4 shows an example of an external clock input connection. In this case, make the external
clock high level to stop it when in standby mode. During operation, make the external input clock
frequency 4–10 MHz.