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SAM4C32-EK [USER GUIDE]
Atmel-11253A-ATARM-SAM4C32-EK-UserGuide_17-Sep-14
3.11 LEDs and Buttons
The SAM4C32-EK is equipped with two user push buttons and three LEDs.
3.11.1 Discrete LEDs
Indicators on the main board include three discrete LEDs:
Blue LED connected to a PIO
Amber LED connected to a PWM output
Green LED connected to a PWM output
Figure 3-23.
Debug Discrete LED Schematic
3.11.2 Push Buttons
The EK board is equipped with four system push buttons and two user push buttons. The push buttons consist of
momentary push-button switches mounted directly to the board. A depressed switch causes a low (zero) to appear
at the associated input pin.
System push buttons:
̶
NRST (Reset, perform system reset)
̶
FWPU (Force Wake-Up)
̶
TMP0 (Tamper)
̶
TMP2 (Tamper)
User push buttons:
̶
SCROLL_UP
̶
SCROLL_DOWN
Figure 3-24.
Push Buttons Schematic
The user can select the pull-up level for the Tamper TMP0 pin by changing the position of JP25. Selecting PB1
instead of VDDBU provides dynamic tampering synchronized with RTCOUT (PB1) pin. This position allows a
diminution of the power consumption when the button is pressed (divided by the Duty Cycle applied on RTCOUT
Output signal).
It is possible to use the TMP2 push button as an additional Tamper input. To use this feature, the user must use
JTAG in 2-wire mode (SWIO and SWD) due to the loss of the TDO pin. In this case, TMP2 is pull-up at RTCOUT
Level (PB1 pin) and can be managed dynamically synchronized with the RTCOUT pin.
LED
PWM
PWM
PC7
PC8
PC6
VDDIN
D9
AMBER
R125
470
Ω
R126
470
Ω
D10
GREEN
D8
BLUE
R127
470
Ω
USER INTERFACE
NRST
FWUP
TMP0
NRST
VDDBU
VDDIN
VDDBU
FWUP
TMP0
JP25
1
2
3
BP2
1
4
2
3
R124
1.5K
BP3
1
4
2
3
BP1
1
4
2
3
R123
100K
R147
100K
PB1
Scroll down
Scroll up
PA20
PA19
BP4
1
4
2
3
BP5
1
4
2
3
TMP2
PB1
PB27
PB1
BP6
1
4
2
3
R149
100K
R148
33R
JP24
(TDO)
1
2
3
R132 0R
R133 0R