ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 67

• 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

6.3.3
6.3.4
6.4
8291A–AVR–10/11
Event Routing Network
Peripheral Clock Events
Software Events
Event users that can utilize data events can also use signaling events. This is configurable, and
is described in the datasheet module for each peripheral.
Each event channel includes a peripheral clock prescaler with a range from 1 (no prescaling) to
32768. This enables configurable periodic event generation based on the peripheral clock. It is
possible to periodically trigger events in a peripheral or to periodically trigger synchronized
events in several peripherals. Since each event channel include a prescaler, different peripher-
als can receive triggers with different intervals.
Events can be generated from software by writing the DATA and STROBE registers. The DATA
register must be written first, since writing the STROBE register triggers the operation. The
DATA and STROBE registers contain one bit for each event channel. Bit n corresponds to event
channel n. It is possible to generate events on several channels at the same time by writing to
several bit locations at once.
Software-generated events last for one clock cycle and will overwrite events from other event
generators on that event channel during that clock cycle.
Table 6-1 on page 67
they are decoded.
Table 6-1.
The event routing network routes the events between peripherals. It consists of four multiplexers
(CHnMUX), which can each be configured to route any event source to any event users. The
output from a multiplexer is referred to as an event channel. For each peripheral, it is selectable
if and how incoming events should trigger event actions. Details on configurations can be found
in the datasheet for each peripheral. The event routing network is shown in
68.
STROBE
0
0
1
1
DATA
Manually generated events and decoding of events.
0
1
0
1
shows the different events, how they can be manually generated, and how
Data Event User
No event
Data event 01
Data event 02
Data event 03
Atmel AVR XMEGA B
Signaling Event User
No event
No event
Signaling event
Signaling event
Figure 6-3 on page
67