ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 161

• Manufacturer Part Number: ATxmega128A1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128A1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 78
• Ext Interrupts: 78
• Usb Speed: No
• Usb Interface: No
• Spi: 12
• Twi (i2c): 4
• Uart: 8
• 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: 4
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• 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: 8
• Output Compare Channels: 24
• Input Capture Channels: 24
• Pwm Channels: 24
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

14.8.4
8077H–AVR–12/09
Dual Slope PWM
Figure 14-13. Single slope Pulse Width Modulation
The PER register defines the PWM resolution. The minimum resolution is 2-bit (PER=0x0003),
and maximum resolution is 16-bit (PER=MAX).
The following equation can be used for calculate the exact resolution for single-slope PWM
(R
The single slow PWM frequency (f
eral clock frequency (f
where N represents the prescaler divider used (1, 2, 4, 8, 64, 256, 1024, or event channel n).
For dual slope PWM generation, the Period (T) is controlled by the PER, while CCx registers
control the duty cycle of the WG output.
ter counts repeatedly from BOTTOM to TOP, and then from TOP to BOTTOM. The waveform
generator output is set on BOTTOM, cleared on compare match when upcounting and set on
compare match when down counting.
R
f
PWM_SS
PWM_SS
PWM_SS
CNT
WG Output
=
):
=
------------------------------ -
N PER
log
---------------------------------- -
(
f
(
log
PER
MAX
PER
TOP
BOT
2 ( )
+
CCx
1
+
)
1
PER
)
), and can be calculated by the following equation:
Period (T)
PWM_SS
Figure 14-14
) depends on the period setting (PER) and the Periph-
CCx=BOT
shows how for dual slope PWM the Coun-
CCx=TOP
XMEGA A
"update"
"match"
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