AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 113
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AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
Specifications of AT90PWM81
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
20
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
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
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
Output Compare Channels
8
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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12.7.2.2
12.8
7734P–AVR–08/10
PSCOUTn1
PSCOUTn0
Period
PSC Inputs
DT0
Enhanced Mode
OT0
The waveform frequency is defined by the following equation:
The Enhanced Mode uses the previously described method to generate a high resolution frequency.
12-13
Figure 12-13. Enhanced Mode, Timing Diagram
The supplementary step in counting to generate f
frame according to the fractional divider.
page
The waveform frequency is defined by the following equations:
d is the fractional divider factor.
The FWM can be applied on different locations within the PSC output waveforms as defined per
12-15 on page 137
Part A or B of PSC has its own system to take into account one PSC n internal input. Each part A or B is
configured by the PSC n Input A/B Control Register (PFRCnA/B
figuration Register ((see Section “PSC 2 Configuration Register – PCNF2”, page 135)
The PSC input module A is shown on
112.
gives an example of FWM with PBFMn1:0 = 00.
T1
DT1
f
PSCn
f2
OT1
f1
PSCn
=
PSCn
f
AVERAGE
----------------------------- -
PSCnCycle
=
=
-----
T
DT0
1
1
2
Table 12-14
-----
T
1
1
=
=
SeeTable 12-6, “Distribution of fb2 in the modulated frame,” on
=
------------------------------------------------------------------------------
(
----- -
16
OT0
d
-------------------------------------------------------------------- -
(
=
OT0
×
f1
-------------------------------------------------------------------- -
(
+
OT0
PSCn
b2
+
OT1
OT0
OT1
is added on the PSCn0 signal while needed in the
f
f
+
CLK_PSCn
CLK_PSCn
+
+
OT1
16 d
-------------- -
f
+
CLK_PSCn
DT0
16
–
DT0
+
T2
×
+
DT0
f2
page
+
DT1
DT1
PSCn
DT1
+
140) and the PSC n Extended Con-
+
DT1
)
1
)
)
OT1+1
AT90PWM81
DT0
Figure
Table
113
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