ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 133

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ATxmega16D4

Manufacturer Part Number
ATxmega16D4
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATxmega16D4

Flash (kbytes)
16 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)
2
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

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12.8.4
8210B–AVR–04/10
Dual Slope PWM
Figure 12-13. 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 WG output
is. 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 12-14
) depends on the period setting (PER) and the Periph-
CCx=BOT
shows how for dual slope PWM the Coun-
CCx=TOP
XMEGA D
"update"
"match"
133

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