ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 135

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• 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: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

12.7
12.8
8291A–AVR–10/11
Port Event
Alternate Port Functions
Table 12-3.
Port pins can generate an event when there is a change on the pin. The sense configurations
decide the conditions for each pin to generate events. Event generation requires the presence of
a peripheral clock, and asynchronous event generation is not possible. For edge sensing, the
changed pin value must be sampled once by the peripheral clock for an event to be generated.
For level sensing, a low-level pin value will not generate events, and a high-level pin value will
continuously generate events. For events to be generated on a low level, the pin configuration
must be set to inverted I/O.
Most port pins have alternate pin functions in addition to being a general purpose I/O pin. When
an alternate function is enabled, it might override the normal port pin function or pin value. This
happens when other peripherals that require pins are enabled or configured to use pins. If and
how a peripheral will override and use pins is described in the section for that peripheral.
The port override signals and related logic (grey) are shown in
signals are not accessible from software, but are internal signals between the overriding periph-
eral and the port pin.
Sense Settings
Rising edge
Falling edge
Both edges
Low level
Limited asynchronous sense support.
Supported
Yes
Yes
No
No
Interrupt Description
-
-
Pin value must be kept unchanged during wake up
Pin level must be kept unchanged during wake up
Atmel AVR XMEGA B
Figure 12-10 on page
136. These
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