ATxmega32D4 Atmel Corporation, ATxmega32D4 Datasheet - Page 105

• Manufacturer Part Number: ATxmega32D4
• Manufacturer: Atmel Corporation

Specifications of ATxmega32D4

• 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 Speed: No
• Usb Interface: No
• Spi: 4
• Twi (i2c): 2
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 200
• Analog Comparators: 2
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• 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: 4
• Output Compare Channels: 14
• Input Capture Channels: 14
• Pwm Channels: 14
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

11.4.5
11.4.6
11.5
8210B–AVR–04/10
Reading the Pin value
Wired-OR
Wired-AND
Figure 11-6. Output configuration - Wired-OR with optional pull-down.
Figure 11-7. 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 11-1 on page
register bit and the preceding flip-flop constitute a synchronizer. The synchronizer is needed to
avoid metastability if the physical pin changes value near the edge of the internal clock. The
Synchronizer introduces a delay on the internal signal line.
timing diagram of the synchronization when reading an externally applied pin value. The maxi-
mum and minimum propagation delays are denoted t
102. If the digital input is disabled, the pin value cannot be read. The IN
OUTn
OUTn
INn
INn
pd,max
and t
Figure 11-8 on page 106
pd,min
respectively.
Pn
Pn
XMEGA D
shows a
105