ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 143
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ATxmega32A4U
Manufacturer Part Number
ATxmega32A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32A4U
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
7
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
1024
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega32A4U-AU
Manufacturer:
ON
Quantity:
1 140
Part Number:
ATxmega32A4U-AUR
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
ATxmega32A4U-CU
Manufacturer:
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Quantity:
20 000
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13.3.4
13.4
8331A–AVR–07/11
Reading the Pin Value
Wired-AND
Figure 13-6. Output configuration - Wired-OR with optional pull-down.
In the wired-AND configuration, the pin will be driven low when the corresponding bits in the
OUT and DIR registers are written to zero. When the OUT register is set to one, the pin is
released allowing the pin to be pulled high with the internal or an external pull-resistor. If internal
pull-up is used, this is also active if the pin is set as input.
Figure 13-7. Output configuration - Wired-AND with optional pull-up.
Independent of the pin data direction, the pin value can be read from the IN register, as shown in
Figure 13-1 on page
register bit and the preceding flip-flop constitute a synchronizer. The synchronizer introduces a
delay on the internal signal line.
chronization when reading an externally applied pin value. The maximum and minimum
propagation delays are denoted as t
140. If the digital input is disabled, the pin value cannot be read. The IN
OUTn
OUTn
INn
INn
Figure 13-8 on page 144
pd,max
and t
pd,min
, respectively.
Atmel AVR XMEGA AU
shows a timing diagram of the syn-
Pn
Pn
143
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