5.3
System clock configuration
The mini module supports the usage of crystal clock sources as well as external clock source:
Table 3.
Clock configuration jumpers
Jumper
Description
Default
Position
J20
XTAL32 configuration
•
Close: connect pin 2 of 32.768 KHz
crystal (Y2) to XTAL32
Open
Figure 8. Overview of SPC58NHADPT302S Rev. A
J21
EXTAL32 configuration
•
Close: Connect pin 1 of 32.768 KHz
crystal (Y2) to EXTAL32
Open
Figure 8. Overview of SPC58NHADPT302S Rev. A
J17
EXTAL configuration
•
1-2 Connect pin 2 of 40 MHz crystal
(Y1) to EXTAL
•
2-3 Connect EVB-EXTAL to EXTAL
1-2
(Y1 pin2 to EXTAL)
Figure 8. Overview of SPC58NHADPT302S Rev. A
J19
XTAL configuration
•
1-2 Connect pin 1 of 40 MHz crystal
(Y1) to XTAL
•
2-3 Connect XTAL to GND
1-2
(Y1 pin1 to XTAL)
Figure 8. Overview of SPC58NHADPT302S Rev. A
J18
Enable 8 MHz oscillator power supply
•
Open – Power off
•
Closed – Power on
Open
(Power off)
Figure 8. Overview of SPC58NHADPT302S Rev. A
J22
External 8 MHz clock source
•
1-2 OSC-MOD (from oscillator)
•
2-3 EXTAL-SMA (from SMA
connector)
1-2
(8 MHz from oscillator)
Figure 8. Overview of SPC58NHADPT302S Rev. A
5.4
Reset circuit
The mini module supports different ways to reset the microcontroller. To use and perform the reset driving there
are different jumpers and switches:
Table 4.
Reset configuration jumpers
Jumper
Description
Default
Position
SW1
Reset push button
Open
Figure 8. Overview of SPC58NHADPT302S Rev. A
J24
Connect the external reset to the reset
driver for ESR0 and PORST pins
Close
Figure 8. Overview of SPC58NHADPT302S Rev. A
J23
Connect the external reset to ESR0 pin
Close
Figure 8. Overview of SPC58NHADPT302S Rev. A
J25
Connect the external reset to PORST pin
Close
Figure 8. Overview of SPC58NHADPT302S Rev. A
UM2725
System clock configuration
UM2725
-
Rev 1
page 9/38
