ATxmega64A3U Atmel Corporation, ATxmega64A3U Datasheet - Page 75
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ATxmega64A3U
Manufacturer Part Number
ATxmega64A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A3U
Flash (kbytes)
64 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
50
Ext Interrupts
50
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
10
Twi (i2c)
2
Uart
7
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)
4
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
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A3U-AU
Manufacturer:
ACTEL
Quantity:
101
Part Number:
ATxmega64A3U-MH
Manufacturer:
TI/德州仪器
Quantity:
20 000
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6.7.2
8331A–AVR–07/11
QDEC Setup
Figure 6-4.
Figure 6-4
QDPH90 are the two quadrature signals. When QDPH90 leads QDPH0, the rotation is defined
as positive or forward. When QDPH0 leads QDPH90, the rotation is defined as negative or
reverse. The concatenation of the two phase signals is called the quadrature state or the phase
state.
In order to know the absolute rotary displacement, a third index signal (QDINDX) can be used.
This gives an indication once per revolution.
For a full QDEC setup, the following is required:
The following procedure should be used for QDEC setup:
• Thw or three I/O port pins for quadrature signal input
• Two event system channels for quadrature decoding
• One timer/counter for up, down, and optional index count
1. Choose two successive pins on a port as QDEC phase inputs.
2. Set the pin direction for QDPH0 and QDPH90 as input.
3. Set the pin configuration for QDPH0 and QDPH90 to low level sense.
4. Select the QDPH0 pin as a multiplexer input for an event channel, n.
5. Enable quadrature decoding and digital filtering in the event channel.
6. Optional:
7. Set quadrature decoding as the event action for a timer/counter.
8. Select event channel n as the event source for the timer/counter.
a. Set up a QDEC index (QINDX).
b. Select a third pin for QINDX input.
c. Set the pin direction for QINDX as input.
d. Set the pin configuration for QINDX to sense both edges.
e. Select QINDX as a multiplexer input for event channel n+1
f.
g. Select the index recognition mode for event channel n+1.
Set the quadrature index enable bit in event channel n+1.
shows typical quadrature signals from a rotary encoder. The signals QDPH0 and
Quadrature signals from a rotary encoder.
Forward Direction
Backward
Direction
QDPH90
QDPH90
QDINDX
QDINDX
QDPH0
QDPH0
00
01
1 cycle / 4 states
Atmel AVR XMEGA AU
10
11
11
10
01
00
75
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