Configuration – Daughter card
S32R274/372 EVB User Guide, Rev. 0, 08/2018
18 NXP Semiconductors
will hold the device in reset via VREG_POR_B until these supplies are within the expected voltage
range. This circuit is active in both internal and external regulation schemes.
Figure 15. Voltage monitoring and reset circuit
Table 9. Reset circuit jumper settings
4.3. MCU external clock circuit
In addition to the internal 16 MHz oscillator, the MCU can be clocked by different external sources. The
EVB system supports four possible MCU clock sources:
1. 40 MHz crystal Y3 (The MCU only has a 40 Mhz input)
2. External clock input to the EVB via the SMA connector (J20), driving the MCU EXTAL signal
3. External differential clock input to the EVB via SMA connectors (J20 & J22), driving MCU
EXTAL and XTAL with negative and positive clock signals respectively
4. External differential or single ended clock input to the EVB via the MIPI-CSI2 connector, for
use with the Eagle MR3003 RF front end board.
The clock circuitry for the daughter card is shown in Figure 16. Each source is selectable via the 0-ohm
links as shown, with crystal Y3 being the default factory option.
To Next Page
Loading...
