ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 180

• 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

14.6.3
14.7
8291A–AVR–10/11
Interrupts and Events
Port Override for Waveform Generation
The PER register defines the PWM resolution. The minimum resolution is two bits
(PER=0x0003), and the maximum resolution is eight bits (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 direc-
tion must be set as output. The timer/counter will override the port pin values when the CMP
channel is enabled (LCMPENx/HCMPENx).
Figure 14-6 on page 180
the low-byte timer/counter, CMP channels A to D will override the output value (OUTxn) of port
pins 0 to 3 on the corresponding port pins (Pxn). For the high-byte timer/counter, CMP channels
E to H will override port pins 4 to 7. Enabling inverted I/O on the port pin (INVENxn) inverts the
corresponding WG output.
Figure 14-6. Port override for low- and high-byte timer/counters.
The timer/counters can generate interrupts and events. The counter can generate an interrupt
on underflow, and each CMP channel for the low-byte counter has a separate compare interrupt.
Events will be generated for all conditions that can generate interrupts. For details on event gen-
eration and available events, refer to
f
R
PWM_SS
PWM_SS
PWM_SS
) waveform:
=
=
------------------------------ -
N PER
log
---------------------------------- -
(
f
(
log
PER
PER
Waveform
2 ( )
+
1
+
)
PER
1
)
), and it is calculated by using the following equation:
shows the port override for the low- and high-byte timer/counters. For
LCMPENx /
HCMPENx
PWM_SS
”Event System” on page
) depends on the period setting (PER) and the periph-
OUT
Atmel AVR XMEGA B
INVEN
70.
OCx
180