ATxmega256A3B Atmel Corporation, ATxmega256A3B Datasheet - Page 71
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ATxmega256A3B
Manufacturer Part Number
ATxmega256A3B
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega256A3B
Flash (kbytes)
256 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
47
Ext Interrupts
49
Usb Speed
No
Usb Interface
No
Spi
8
Twi (i2c)
2
Uart
6
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
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
16
Eeprom (bytes)
4096
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
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Quantity
Price
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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
71
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