ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 71

• Manufacturer Part Number: ATxmega128A1
• 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

6.8
6.8.1
8077H–AVR–12/09
Register Description
CHnMUX – Event Channel n Multiplexer Register
The angle of a quadrature encoder attached to QDPH0, QDPH90 (and QINDX) can now be read
directly from the Timer/Counter Count register. If the Count register is different from BOTTOM
when the index is recognized, the Timer/Counter error flag is set. Similarly the error flag is set if
the position counter passes BOTTOM without the recognition of the index.
.
• Bit 7:0 - CHnMUX[7:0]: Channel Multiplexer
These bits select the event source according to
devices regardless of if the peripheral is present or not. Selecting event sources from peripher-
als that are not present will give the same result as when this register is zero. When this register
is zero no events are routed through. Manually generated events will override the CHnMUX and
be routed to the event channel even if this register is zero.
Table 6-3.
Bit
Read/Write
Initial Value
• Set the period register of the Timer/Counter to ('line count' * 4 - 1). (The line count of the
• Enable the Timer/Counter by setting CLKSEL to a CLKSEL_DIV1.
CHnMUX[7:4]
quadrature encoder).
0000
0000
0000
0000
0000
0000
0000
0000
0001
0001
0001
0001
0001
0001
0001
R/W
CHnMUX[7:0] Bit Settings
7
0
CHnMUX[3:0]
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
R/W
0
0
0
1
0
0
0
1
0
0
0
0
1
1
1
6
0
X
X
0
0
1
0
0
1
0
0
1
1
0
0
1
X
X
X
X
X
R/W
0
1
0
1
0
1
0
1
0
1
5
0
Group Configuration
RTC_OVF
RTC_CMP
ACA_CH0
ACA_CH1
ACA_WIN
ACB_CH0
ACB_CH1
ACB_WIN
R/W
4
0
CHnMUX[7:0]
Table
R/W
3
0
6-3. This table is valid for all XMEGA
R/W
Event Source
None (manually generated events
only)
(Reserved)
(Reserved)
(Reserved)
RTC Overflow
RTC Compare March
(Reserved)
(Reserved)
ACA Channel 0
ACA Channel 1
ACA Window
ACB Channel 0
ACB Channel 1
ACB Window
(Reserved)
2
0
R/W
1
0
XMEGA A
R/W
0
0
CHnMUX
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