Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Data Sheet
Product codes
ATSAM4E-EK
SAM4E-EK User Guide
42067A
−SAM4E−01/2013
16
4.3.12 Touch screen interface
The LCD module integrates a 4-wire touch panel controlled by MN16 (ADS7843) which is a slave device on the
SAM4E16 SPI bus. The controller sends back the measurement information about the X and Y positions as a pressure
is applied to the touch panel. The touch panel can be used with either a stylus or a finger.
SAM4E16 SPI bus. The controller sends back the measurement information about the X and Y positions as a pressure
is applied to the touch panel. The touch panel can be used with either a stylus or a finger.
The ADS7843 touch panel controller connects to the SPI interface via the NPCS0 control signal. Two interrupt signals
are connected and provide events information back to the microcontroller: PenIrq and Busy.
are connected and provide events information back to the microcontroller: PenIrq and Busy.
Note:
PenIrq (PA16) is shared with ZigBee signal ZIGB_MISC.
Busy (PA17) is shared with ZigBee signal ZIGB_IRQ.
Therefore, if using a ZigBee interface in concurrence with the Touch Screen controller, take care not to have both
drivers enabled at the same time on either PA16 or PA17.
Busy (PA17) is shared with ZigBee signal ZIGB_IRQ.
Therefore, if using a ZigBee interface in concurrence with the Touch Screen controller, take care not to have both
drivers enabled at the same time on either PA16 or PA17.
Figure 4-12. Touch panel control.
R29
0R
R26
1R
C39
100nF
R22
0R
MN16
ADS7843E
XP
2
YP
3
XM
4
YM
5
DCLK
16
DIN
14
DOUT
12
CS
15
BUSY
13
PENIRQ
11
VREF
9
VCC1
1
VCC2
10
GND
6
IN3
7
IN4
8
R19
100K
R28
100K
L2 10uH-150mA
TP3
C40
100nF
TP2
R23 0R
C41
100nF
C42
4.7uF
R27
100K
R25
0R
R21
100K
+3V3
+3V3
+3V3
AGND_TP
AGND_TP
LCD TOUCH SCREEN
PA14
PA13
PA12
PA11
PA17
X_RIGHT
Y_DOWN
X_LEFT
Y_UP
PA16
JP9
4.3.13 JTAC/ICE
A standard 20-pin JTAG/ICE connector is implemented on the Atmel SAM4E-EK for the connection of a compatible
ARM JTAG emulator interface, such as the SAM-ICE™ from Segger.
ARM JTAG emulator interface, such as the SAM-ICE™ from Segger.
Note that the NRST signal is connected to BP1 system button and is also used to reset the LCD module. The 0Ω
resistor R61 may be removed in order to isolate the JTAG port from this system reset signal.
resistor R61 may be removed in order to isolate the JTAG port from this system reset signal.
Figure 4-13. JTAG interface.
R56
100K
J8
HE10 20PTS
VTref
1
Vsupply
2
nTRST
3
GND1
4
TDI
5
GND2
6
TMS
7
GND3
8
TCK
9
GND4
10
RTCK
11
GND5
12
TDO
13
GND6
14
nSRST
15
GND7
16
DBGRQ
17
GND8
18
DBGACK
19
GND9
20
R57
100K
R61
0R
R53
100K
R54
100K
R55
100K
+3V3
PB6
PB4
NRST
ICE INTERFACE
PB5
PB7