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ATTINY2313-20PU Datenblatt(PDF) 27 Page - ATMEL Corporation

Teilenummer ATTINY2313-20PU
Bauteilbeschribung  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATTINY2313-20PU Datenblatt(HTML) 27 Page - ATMEL Corporation

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27
ATtiny2313/V
2543I–AVR–04/06
Notes:
1. These options should only be used when not operating close to the maximum fre-
quency of the device, and only if frequency stability at start-up is not important for the
application. These options are not suitable for crystals.
2. These options are intended for use with ceramic resonators and will ensure fre-
quency stability at start-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.
Calibrated Internal RC
Oscillator
The calibrated internal RC Oscillator provides a fixed 8.0 MHz clock. The frequency is
nominal value at 3V and 25
°C. If 8 MHz frequency exceeds the specification of the
device (depends on V
CC), the CKDIV8 Fuse must be programmed in order to divide the
internal frequency by 8 during start-up. The device is shipped with the CKDIV8 Fuse
programmed. This clock may be selected as the system clock by programming the
CKSEL Fuses as shown in Table 6. If selected, it will operate with no external compo-
nents. During reset, hardware loads the calibration byte into the OSCCAL Register and
thereby automatically calibrates the RC Oscillator. At 3V and 25
°C, this calibration gives
a frequency within ± 10% of the nominal frequency. Using calibration methods as
described in application notes available at www.atmel.com/avr it is possible to achieve ±
2% accuracy at any given V
CC and Temperature. When this Oscillator is used as the
chip clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the
Reset Time-out. For more information on the pre-programmed calibration value, see the
section “Calibration Byte” on page 164.
Note:
1. The device is shipped with this option selected.
Table 5. Start-up Times for the Crystal Oscillator Clock Selection
CKSEL0
SUT1..0
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(VCC = 5.0V)
Recommended Usage
0
00
258 CK(1)
14CK + 4.1 ms
Ceramic resonator, fast
rising power
0
01
258 CK(1)
14CK + 65 ms
Ceramic resonator,
slowly rising power
010
1K CK(2)
14CK
Ceramic resonator,
BOD enabled
011
1K CK(2)
14CK + 4.1 ms
Ceramic resonator, fast
rising power
100
1K CK(2)
14CK + 65 ms
Ceramic resonator,
slowly rising power
1
01
16K CK
14CK
Crystal Oscillator, BOD
enabled
1
10
16K CK
14CK + 4.1 ms
Crystal Oscillator, fast
rising power
1
11
16K CK
14CK + 65 ms
Crystal Oscillator,
slowly rising power
Table 6. Internal Calibrated RC Oscillator Operating Modes
CKSEL3..0
Nominal Frequency
0010 - 0011
4.0 MHz
0100 - 0101
8.0 MHz
(1)


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