SAMA5D3x-EK User Guide
6-19
11180A–ATARM–30-Jan-13
6.2.15.2 CS_BOOT Button
The CS_BOOT can be used to prevent the system to boot out of external memories (NandFlash, SPI
flash). The purpose is mainly to execute the SAM-BA part of the ROM code.
2 methods can be used:
1.
Press the CS_BOOT and power-cycle the board.
2.
Press the CS_BOOT and then press the NRST button.
Figure 6-19. PushButton
6.2.16
Analog Reference
The 3V voltage reference is based on a LM4040 (Precision Micropower Shunt Voltage Reference).
This ADVREF level can be set as 3V or 3.3V via the jumper JP14.
3V3
NRST
3,10,14
WAKE UP 3
VBAT
PE27
3,9,13
CS_BOOT_DISABLE
3
WAKE UP
NRST
PUSH BUTTON
PB_USER1
PB_USER1
CS_BOOT
PB1
PB1
PB2
PB2
R142
1.5k
R142
1.5k
PB3
PB3
R141
100k
R141
100k
PB4
PB4
R46
0R
R46
0R
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