ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 141
ATxmega128A3U
Manufacturer Part Number
ATxmega128A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A3U
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
50
Ext Interrupts
50
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
10
Twi (i2c)
2
Uart
7
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
8
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128A3U-AU
Manufacturer:
ATMEL
Quantity:
39
Company:
Part Number:
ATxmega128A3U-MH
Manufacturer:
ATMEL
Quantity:
1
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13.3.1
13.3.1.1
8331A–AVR–07/11
Totem-pole
Totem-pole with Pull-down
The pin n configuration (PINnCTRL) register is used for additional I/O pin configuration. A pin
can be set in a totem-pole, wired-AND, or wired-OR configuration. It is also possible to enable
inverted input and output for a pin.
A totem-pole output has four possible pull configurations: totem-pole (push-pull), pull-down, pull-
up, and bus-keeper. The bus-keeper is active in both directions. This is to avoid oscillation when
disabling the output. The totem-pole configurations with pull-up and pull-down have active resis-
tors only when the pin is set as input. This feature eliminates unnecessary power consumption.
For wired-AND and wired-OR configuration, the optional pull-up and pull-down resistors are
active in both input and output directions.
Since pull configuration is configured through the pin configuration register, all intermediate port
states during switching of the pin direction and pin values are avoided.
The I/O pin configurations are summarized with simplified schematics in
141
In the totem-pole (push-pull) configuration, the pin is driven low or high according to the corre-
sponding bit setting in the OUT register. In this configuration, there is no current limitation for
sink or source other than what the pin is capable of. If the pin is configured for input, the pin will
float if no external pull resistor is connected.
Figure 13-2. I/O pin configuration - Totem-pole (push-pull).
In this mode, the configuration is the same as for totem-pole mode, expect the pin is configured
with an internal pull-down resistor when set as input.
Figure 13-3. I/O pin configuration - Totem-pole with pull-down (on input).
to
Figure 13-7 on page
OUTn
OUTn
DIRn
DIRn
143.
INn
INn
Atmel AVR XMEGA AU
Pn
Pn
Figure 13-2 on page
141
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