AT90PWM3B Atmel Corporation, AT90PWM3B Datasheet - Page 142

• Manufacturer Part Number: AT90PWM3B
• Manufacturer: Atmel Corporation

Specifications of AT90PWM3B

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 105
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 5
• Output Compare Channels: 16
• Input Capture Channels: 1
• Pwm Channels: 12
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

16.7.2
16.7.2.1
16.7.2.2
142
PSCOUTn1
PSCOUTn0
Period
AT90PWM2/3/2B/3B
Modes of Operation
DT0
Normal Mode
Enhanced Mode
OT0
The simplest mode of operation is the normal mode. See
The active time of PSCOUTn0 is given by the OT0 value. The active time of PSCOUTn1 is given
by the OT1 value. Both of them are 12 bit values. Thanks to DT0 & DT1 to ajust the dead time
between PSCOUTn0 and PSCOUTn1 active signals.
The waveform frequency is defined by the following equation:
The Enhanced Mode uses the previously described method to generate a high resolution
frequency.
Figure 16-13. Enhanced Mode, Timing Diagram
The supplementary step in counting to generate f
in the frame according to the fractional divider.
lated frame,” on page
The waveform frequency is defined by the following equations:
d is the fractionel divider factor.
T1
DT1
f
PSCn
=
141.
f2
OT1
----------------------------- -
PSCnCycle
f1
PSCn
PSCn
f
AVERAGE
1
=
=
----- -
T
1
DT0
2
----- -
T
1
1
=
=
=
=
------------------------------------------------------------------------------- -
(
----------------------------------------------------------------------
(
----- -
16
OT0
d
OT0
----------------------------------------------------------------------
(
OT0
×
f1
+
+
PSCn
+
OT1
OT1
f
SeeTable 16-5, “Distribution of fb2 in the modu-
OT0
CLK_PSCn
OT1
f
f
b2
CLK_PSCn
CLK_PSCn
+
+
is added on the PSCn0 signal while needed
+
16 d
-------------- -
+
DT0
16
DT0
–
DT0
T2
Figure
×
+
+
f2
+
DT1
DT1
DT1
PSCn
DT1
16-6.
)
+
)
1
=
)
OT1+1
=
1
4317J–AVR–08/10
DT0