ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 193
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ATxmega128A3U
Manufacturer Part Number
ATxmega128A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A3U
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
50
Ext Interrupts
50
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
10
Twi (i2c)
2
Uart
7
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
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
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128A3U-AU
Manufacturer:
ATMEL
Quantity:
39
Company:
Part Number:
ATxmega128A3U-MH
Manufacturer:
ATMEL
Quantity:
1
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15.6.3
8331A–AVR–07/11
Port override for Waveform Generation
Figure 15-5. Single slope Pulse Width Modulation
The PER register defines the PWM resolution. The minimum resolution is 2-bit (PER=0x0003),
and the maximum resolution is 8-bit (PER=MAX).
The following equation is used to calculate the exact resolution for a 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).
To make the waveform generation available on the port pins the corresponding port pin direction
must be set as output. The Timer/Counter will override the port pin values when the CMP chan-
nel is enabled (CMPLENx/CMPHENx).
Figure 15-6 on page 193
Timer/Counter Low, CMP channels A to D will override port pins 0 to 3 output value (OUTxn) on
the corresponding port pin (Pxn). For Timer/Counter High, CMP channels E to H will override
port pin 4 to 7. Enabling inverted I/O on the port pin (INVENxn) inverts the corresponding WG
output.
Figure 15-6. Port override for Timer/Counter Low and High
f
R
PWM_SS
CNT
WG Output
PWM_SS
PWM_SS
Waveform
):
=
BOTTOM
=
------------------------------ -
N PER
log
---------------------------------- -
(
MAX
TOP
f
(
log
PER
PER
CMPx
2 ( )
+
1
+
)
PER
1
)
), and it is calculated by using the following equation:
shows the port override for fthe Timer/Counter Low and High. For
Period (T)
CMPLENx/HENx
PWM_SS
OUT
) depends on the period setting (PER) and the Periph-
CMPx=TOP
Atmel AVR XMEGA AU
CMPx=BOT
INVEN
"match"
OCx
193
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