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ST72321xx-Auto Electrical characteristics
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19.5.4 RC oscillators
Figure 80. Typical f
OSC(RCINT)
versus T
A
Note: To reduce disturbance to the RC oscillator, it is recommended to place decoupling
capacitors between V
DD
and V
SS
as shown in Figure 100.
Table 117. OSCRANGE selection for typical resonators
Supplier f
OSC
(MHz)
Typical ceramic resonators
(1)
1. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these
resonators, please consult www.murata.com.
Reference
Recommended OSCRANGE option bit
configuration
Murata
2 CSTCC2M00G56A-R0 MP mode
(2)
2. LP mode is not recommended for 2 MHz resonator because the peak to peak amplitude is too small
(> 0.8V).
4 CSTCR4M00G55B-R0 MS mode
8 CSTCE8M00G55A-R0
HS mode
16 CSTCE16M0G53A-R0
Table 118. RC oscillator characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
OSC(RCINT)
Internal RC oscillator frequency
(see Figure 80)
T
A
=25°C, V
DD
=5V 2 3.5 5.6 MHz
3
3.2
3.4
3.6
3.8
4
-45 0 25 70 130
T
A
(°C)
f
OSC(RCINT)
(MHz)
Vdd = 5V
Vdd = 5.5V
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