ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 132
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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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13.4.1.2
13.4.2
13.4.3
8077H–AVR–12/09
Bus-keeper
Wired-OR
Totem-pole with Pull-up
In this mode, the configuration is as for Totem-pole, expect the pin is configured with internal
pull-up when set as input.
Figure 13-4. I/O pin configuration - Totem-pole with pull-up (on input).
When the pin is configured for bus-keeper, it provides a weak bus-keeper that will keep the pin
at its logic level when the pin is no longer driven to any logic state. If last level on the pin/bus was
1, the bus-keeper will use the internal pull resistor to keep the bus high. If last logic level on the
pin/bus was 0, the bus-keeper will use the internal pull resistor to keep the bus high.
The bus-keeper’s week output produces the same logical level as the last output level. It acts as
a pull-up if the last level was '1', and pull-down if the last level was '0'.
Figure 13-5. I/O pin configuration - Totem-pole with bus-keeper
With Wired-OR configuration, the pin will be driven high when the corresponding bit in OUT is
written to one. When OUT is set to zero, the pin is released allowing the pin to be pulled low with
the internal or an external pull-resistor. If internal pull-down is used, this is also active if the pin is
set as input.
OUTn
OUTn
DIRn
DIRn
INn
INn
Pn
Pn
XMEGA A
132
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