AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 32
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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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32
AT90PWM81
The Oscillator can operate in three different modes, each optimized for a specific frequency range. The
operating mode is selected by CKSEL3..1 fuses or by CSEL3..1 field as shown in
Table 5-6.
Notes:
The CKSEL0 Fuse together with the SUT1..0 Fuses or CSEL0 together with CSUT1..0 field select the
start-up times as shown in
Table 5-7.
Notes:
CKSEL0
CSEL0
CKSEL3..1
CSEL3..1
0
0
0
0
1
1
1
1
100
101
110
111
1. Flash Fuse bits.
2. CLKSELR register bits.
3. This option should not be used with crystals, only with ceramic resonators.
1. Flash Fuse bits.
2. CLKSELR register bits.
3. These options should only be used when not operating close to the maximum frequency of the device,
4. These options are intended for use with ceramic resonators and will ensure frequency stability at start-
(2)
(1)
(3)
and only if frequency stability at start-up is not important for the application. These options are not suit-
able for crystals.
up. They can also be used with crystals when not operating close to the maximum frequency of the
device, and if frequency stability at start-up is not important for the application.
(2)
(1)
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
CSUT1..0
SUT1..0
00
01
10
00
01
10
11
11
Frequency Range (MHz)
(1)
(2)
Table
8.0 - 16.0
5-7.
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
Start-up Time from
Power-down and
16K (16384) CK
16K (16384) CK
16K (16384) CK
1K (1024) CK
1K (1024)CK
1K (1024)CK
Power-save
258 CK
258 CK
(3)
(3)
(4)
(4)
(4)
Additional Delay
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 65 ms
14CK + 65 ms
14CK + 65 ms
(Vcc = 5.0V)
from Reset
C1 and C2 for Use with Crystals (pF)
Recommended Range for Capacitors
14CK
14CK
12 - 22
12 - 22
12 - 22
Recommended Usage
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Ceramic resonator, BOD
enabled
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Crystal Oscillator, BOD
enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator, slowly
rising power
–
Table
5-6.
7734P–AVR–08/10
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