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ST72734 Folha de dados(PDF) 19 Page - STMicroelectronics

Nome de Peças ST72734
Descrição Electrónicos  8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
PDF  144 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72734 Folha de dados(HTML) 19 Page - STMicroelectronics

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CLOCK SYSTEM (Cont’d)
3.1.2 Crystal Resonator
The internal oscillator is designed to operate with
an
AT-cut
parallel
resonant
quartz
crystal
resonator in the frequency range specified for fosc.
The circuit shown in Figure 8 is recommended
when
using
a
crystal,
and
Table 4,
“.
Recommended Crystal Values,” on page 19 lists
the recommended capacitance and feedback
resistance values. The crystal and associated
components should be mounted as close as
possible to the input pins in order to minimize
output distortion and start-up stabilization time.
Figure 8. Crystal/Ceramic Resonator
Table 4
. Recommended Crystal Values
Legend:
CL1, CL2 = Maximum total capacitance on pins
OSCIN and OSCOUT (the value includes the
external capacitance tied to the pin plus the
parasitic capacitance of the board and of the
device).
RSMAX = Maximum series parasitic resistance of
the quartz allowed.
Note: The tables are relative to the quartz crystal
only (not ceramic resonator).
3.1.3 External Clock
An external clock should be applied to the OSCIN
input with the OSCOUT pin not connected as
shown in Figure 9. The Crystal clock specifications
do not apply when using an external clock input.
The equivalent specification of the external clock
source should be used.
Figure 9. External Clock Source Connections
OSCIN
OSCOUT
CL1
CL2
CRYSTAL CLOCK
1M*
*Recommended for oscillator stability
24 Mhz
Unit
RSMAX
70
25
20
Ohms
CL1
22
47
56
pf
CL2
22
47
56
pf
OSCIN
OSCOUT
EXTERNAL
CLOCK
NC



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