ATtiny85 Atmel Corporation, ATtiny85 Datasheet - Page 30

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ATtiny85

Manufacturer Part Number
ATtiny85
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATtiny85

Flash (kbytes)
8 Kbytes
Pin Count
8
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
3
Hardware Qtouch Acquisition
No
Max I/o Pins
6
Ext Interrupts
6
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
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 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
5
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes

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6.2.6
30
ATtiny25/45/85
Crystal Oscillator / Ceramic Resonator
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con-
figured for use as an On-chip Oscillator, as shown in
ceramic resonator may be used.
Figure 6-5.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in
given by the manufacturer should be used.
Table 6-12.
Notes:
The Oscillator can operate in three different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL[3:1] as shown in
The CKSEL0 Fuse together with the SUT[1:0] Fuses select the start-up times as shown in
6-13.
Table 6-13.
CKSEL[3:1]
CKSEL0
100
0
0
0
101
110
111
(1)
1. This option should not be used with crystals, only with ceramic resonators.
SUT[1:0]
Crystal Oscillator Connections
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
00
01
10
Frequency Range (MHz)
Start-up Time from
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
1K (1024) CK
Power-down
8.0 -
Table 6-12
258 CK
258 CK
(1)
(1)
C2
C1
(2)
below. For ceramic resonators, the capacitor values
Additional Delay
Recommended Range for Capacitors C1 and
14CK + 64 ms
14CK + 4 ms
from Reset
XTAL2
XTAL1
GND
Figure
14CK
C2 for Use with Crystals (pF)
6-5. Either a quartz crystal or a
12 - 22
12 - 22
12 - 22
Recommended Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Ceramic resonator,
BOD enabled
Table
2586N–AVR–04/11
6-12.
Table

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