SAM9X35 Atmel Corporation, SAM9X35 Datasheet - Page 975

• Manufacturer Part Number: SAM9X35
• Manufacturer: Atmel Corporation

Specifications of SAM9X35

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: Yes
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Figure 42-10. Insertion of Touchscreen sequences (TSFREQ = 2; TSAV = 1)
42.7.8
42.7.9
11055B–ATARM–22-Sep-11
Trigger event
ADC_SEL
Measured Values, Registers and Flags
Pen Detect Method
YRDY
XRDY
As soon as the controller finishes the Touchscreen sequence, XRDY, YRDY and PRDY are set
and can generate an interrupt. These flags can be read in the “ADC Interrupt Status Register”.
They are reset independently by reading in ADC_XPOSR, ADC_YPOSR and ADC_PRESSR.
for classic ADC conversions.
The “ADC Touchscreen X Position Register” presents XPOS (V
XSCALE (V
The “ADC Touchscreen Y Position Register” presents YPOS (V
YSCALE (V
To improve the quality of the measure, the user must calculate: XPOS/XSCALE and
YPOS/YSCALE.
V
can change during use, so it can be necessary to refresh them. Refresh can be done by writing
‘1’ in the CALIB field of the control register (ADC_CR).
The “ADC Touchscreen Pressure Register” presents Z1 on its LSB and Z2 aligned on the 16th
bit. See
When there is no contact, it is not necessary to perform a conversion. However, it is important to
detect a contact by keeping the power consumption as low as possible.
The implementation polarizes one panel by closing the switch on (X
panel by an embedded resistor connected to Y
switch. Since there is no contact, no current is flowing and there is no related power consump-
tion. As soon as a contact occurs, a current is flowing in the Touchscreen and a Schmitt trigger
detects the voltage in the resistor.
The Touchscreen Interrupt configuration is entered by programming the PENDET bit in the
“ADC Touchscreen Mode Register”. If this bit is written at 1, the controller samples the pen con-
tact state when it is not converting and waiting for a trigger.
C T
XMAX,
C: Classic ADC Conversion Sequence
V
Section 42.7.4
Xmin,
XMAX
YMAX
C T
V
YMAX,
- V
- V
Xmin
Ymin
and V
) aligned on the 16th bit.
) aligned on the 16th bit.
to know how use them.
C
Ymin
ADC_XPOSR
Read the
are measured at the first start up of the controller. These values
ADC_YPOSR
C
Read the
- T: Touch Screen Sequence
M
C
/ Sense. This resistor is enabled by a fifth
T
C T
P
X
Y
/U
- V
- V
L
) and ties the horizontal
Xmin
Ymin
C
ADC_YPOSR
Read the
ADC_XPOSR
SAM9X35
) on its LSB and
) on its LSB and
Read the
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