ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 131
ATxmega128A1
Manufacturer Part Number
ATxmega128A1
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A1
Flash (kbytes)
128 Kbytes
Pin Count
100
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
78
Ext Interrupts
78
Usb Speed
No
Usb Interface
No
Spi
12
Twi (i2c)
4
Uart
8
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
4
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
8
Eeprom (bytes)
2048
Self Program Memory
YES
External Bus Interface
1
Dram Memory
sdram
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
8
Output Compare Channels
24
Input Capture Channels
24
Pwm Channels
24
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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13.4
13.4.1
13.4.1.1
8077H–AVR–12/09
I/O Pin Configuration
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 the pin.
For totem-pole output there are 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 oscil-
lation when disabling the output. The totem-pole configurations with pull-up and pull-down only
have active resistors 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 direction.
Since pull configuration is configured through the pin configuration register, all intermediate port
states during switching of pin direction and pin values are avoided.
The I/O pin configurations are summarized with simplified schematics from
131
When configured for Totem-pole (push-pull), the pin is driven low or high according to the corre-
sponding bit setting in OUT. 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 exter-
nal pull is connected.
Figure 13-2. I/O pin configuration - Totem-pole (push-pull)
In this mode, the configuration is as for Totem-pole, expect the pin is configured with internal
pull-down 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
DIRn
133.
INn
OUTn
DIRn
INn
Pn
Figure 13-2 on page
XMEGA A
Pn
131
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