ATxmega128A4U Atmel Corporation, ATxmega128A4U Datasheet - Page 166

• Manufacturer Part Number: ATxmega128A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega128A4U

• Flash (kbytes): 128 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• 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): 8
• 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: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

14.3
8331A–AVR–07/11
Block Diagram
“compare channels.” When used for capture operations, the CC channels are referred to as
“capture channels.”
Figure 14-2 on page 166
extensions.
Figure 14-2. Timer/counter block diagram.
The counter register (CNT), period registers with buffer (PER and PERBUF), and compare and
capture registers with buffers (CCx and CCxBUF) are 16-bit registers. All buffer register have a
buffer valid (BV) flag that indicates when the buffer contains a new value.
During normal operation, the counter value is continuously compared to zero and the period
(PER) value to determine whether the counter has reached TOP or BOTTOM.
The counter value is also compared to the CCx registers. These comparisons can be used to
generate interrupt requests, request DMA transactions or generate events for the event system.
Bus Bridge
Base Counter
Compare/Capture
(x = {A,B,C,D})
Counter
B
B
PERBUF
CCxBUF
shows a detailed block diagram of the timer/counter without the
PER
CNT
CCx
=
I/O Data Bus (8-bit)
= 0
=
Clock Select
Event Select
Atmel AVR XMEGA AU
CKSEL
EVSEL
"count"
"clear"
"load"
"direction"
"capture"
"match"
TOP
BOTTOM
Control Logic
Control Logic
Generation
Waveform
OVF/UNF
(INT/DMA Req.)
ERRIF
(INT Req.)
OCx Out
CCxIF
(INT/DMA
Req.)
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