AT90PWM81-16SF Atmel, AT90PWM81-16SF Datasheet - Page 112

• Manufacturer Part Number: AT90PWM81-16SF
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12.7.2
12.7.2.1
112
AT90PWM81
Modes of Operation
Normal Mode
Table 12-6.
While ‘X’ in the table, f
So for each row, a number of fb2 take place of fb1.
Figure 12-12. Resulting Frequency versus d.
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 adjust the dead time between
PSCOUTn0 and PSCOUTn1 active signals.
Distribution of fb2 in the modulated frame
Fraction
al
Divider
(d)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
d:
f
b1
0
1
PWM - cycle
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Distribution of f
2
1
X
X
X
X
X
X
X
3
b2
2
X
X
X
X
X
X
X
X
X
X
X
prime to f
4
3
X
X
X
b2
5
in the modulated frame
b1
4
X
X
X
X
X
X
X
X
X
X
X
X
X
6
in cycle corresponding cycle.
7
5
X
X
X
X
X
8
6
X
X
X
X
X
X
X
X
X
9 10 11 12 13 14 15
7
X
Figure
8
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12-6.
9
X
X
X
X
X
X
10
X
X
X
X
X
X
X
X
X
X
X
X
11
f
12
X
X
X
X
X
X
X
X
X
X
X
X
b2
13
X
X
X
X
7734P–AVR–08/10
f
OP
14
X
X
X
X
X
X
X
X
15