ST SPC574KADPT144S, Руководство пользователя

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5.3 System clock configuration
The mini module supports the usage of crystal clock sources as well as external clock source:
Table 3. System clock related jumpers
Jumper Description Default Position
J14
EXTAL connection configuration:
•
1-2: EXTAL connected to 40 MHz crystal clock
source
• 2-3: EXTAL connected to EXTAL EVB clock
source
1-2 (XT1 pin 1)
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– C3
J17
XTAL connection configuration:
•
1-2: XTAL connected to GND
• 2-3: XTAL connected to 40 MHz crystal clock
source
2-3 (XT1 pin 2)
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– C3
J18
8MHz oscillator power supply jumper:
•
Open: 8MHz oscillator power supply not
connected
• Closed: 8MHz oscillator power supply
connected to 3.3V_SR
Open
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D3
J20
External clock source jumper selector:
•
1-2: from SMA connector
• 2-3: from 8MHz oscillator
1-2 (SMA
Connector)
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D3
5.4 Reset circuit configuration
The mini module supports different way to reset the device. To use and perform the reset driving there are
different jumper and switch:
Table 4. Reset related jumpers
Jumper Description Default Position
SW1 Reset push button Open
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D1
J19
External reset connection to ESR0 pin configuration:
•
Open: the external reset is not connected to ESRO pin
• Closed: the external reset is connected to ESRO pin
Closed
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D1
J21
External reset connection to reset driver configuration:
•
Open: the external reset is not connected to the reset
driver for ESRO and PORST pins
• Closed: the external reset is connected to the reset
driver for ESRO and PORST pins
Closed
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D1
J22
External reset connection to PORST pin configuration:
•
Open: the external reset is not connected to PORST
pin
• Closed: the external reset is connected to PORST pin
Closed
Figure 10. Overview of
SPC574KADPT144S Rev. B mini module
- top
– D2
UM2872
System clock configuration
UM2872 - Rev 1
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