ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 179

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• 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: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

14.6
14.6.1
14.6.2
8291A–AVR–10/11
Compare Channel
Waveform Generation
Single-slope PWM Generation
Figure 14-4. Changing the period.
Each compare channel continuously compares the counter value with the CMPx register. If CNT
equals CMPx, the comparator signals a match. For the low-byte timer/counter, the match will set
the compare channel's interrupt flag at the next timer clock cycle, and the event and optional
interrupt is generated. The high-byte timer/counter does not have compare interrupt/event.
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 can be achieved by setting invert I/O on the port pin. Refer to
Ports” on page 142
For PWM generation, the period (T) is controlled by the PER register, while the CMPx registers
control the duty cycle of the waveform generator (WG) output.
how the counter counts from TOP to BOTTOM, and then restarts from TOP. The WG output is
set on the compare match between the CNT and CMPx registers, and cleared at BOTTOM.
Figure 14-5. Single-slope pulse width modulation.
CNT
1. The compare channels to be used must be enabled. This will override the correspond-
2. The direction for the associated port pin must be set to output.
CNT
WG Output
ing port pin output register.
BOTTOM
BOTTOM
MAX
MAX
TOP
CMPx
New TOP written to
PER that is higher
than current CNT
for more details.
Period (T)
CMPx=TOP
New TOP written to
PER that is lower
than current CNT
Atmel AVR XMEGA B
Figure 14-5 on page 179
CMPx=BOT
"reload"
"write"
"match"
shows
”I/O
179