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ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
3.11
LEDs and Buttons
The ATSAM4C-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:
1 blue LED connected to a PIO
1 amber LED connected to a PWM output
1 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. When any switch is depressed it will cause 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
It is possible to select the pull-up level for Tamper TMP0 pin. By selecting PB1 instead of VDDBU, it allows to end user a
dynamic tampering synchronized with RTCOUT pin. It 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 another Tamper input. By using this feature, the end 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
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