ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 174
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 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
2
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)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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14.8.1
14.8.2
14.8.3
8331A–AVR–07/11
Waveform Generation
Frequency (FRQ) Waveform Generation
Single-slope PWM Generation
synchronization prevents the occurrence of odd-length, non-symmetrical pulses for glitch-free
output.
The compare channels can be used for waveform generation on the corresponding port pins. To
make the waveform visible on the connected port pin, the following requirements must be
fulfilled:
Inverted waveform output is achieved by setting the invert output bit for the port pin.
For frequency generation the period time (T) is controlled by the CCA register instead of PER.
The waveform generation (WG) output is toggled on each compare match between the CNT and
CCA registers, as shown in
Figure 14-14. Frequency waveform generation.
The waveform frequency (f
where N represents the prescaler divider used. The waveform generated will have a maximum
frequency of half of the peripheral clock frequency (fclk
and no prescaling is used. This also applies when using the hi-res extension, since this
increases the resolution and not the frequency.
For single-slope PWM generation, the period (T) is controlled by PER, while CCx registers con-
trol the duty cycle of the WG output.
f
FRQ
1. A waveform generation mode must be selected.
2. Event actions must be disabled.
3. The CC channels used must be enabled. This will override the corresponding port pin
4. The direction for the associated port pin must be set to output.
CNT
WG Output
output register.
=
---------------------------------- -
2N CCA
BOTTOM
fclk
(
MAX
TOP
PER
+
1
)
FRQ
Figure 14-14 on page
Period (T)
) is defined by the following equation:
Figure 14-15
Direction Change
shows how the counter counts from BOTTOM
174.
Atmel AVR XMEGA AU
PER
) when CCA is set to zero (0x0000)
CNT written
"update"
174
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