ATtiny2313 Atmel Corporation, ATtiny2313 Datasheet - Page 25

• Manufacturer Part Number: ATtiny2313
• Manufacturer: Atmel Corporation

Specifications of ATtiny2313

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 18
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• 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: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

Calibrated Internal
RC Oscillator
2543L–AVR–08/10
Table 5. Start-up Times for the Crystal Oscillator Clock Selection
Notes:
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
ing 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
selected, it will operate with no external components. During reset, hardware loads the calibra-
tion 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 possi-
ble to achieve ± 2% accuracy at any given V
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
Table 6. Internal Calibrated RC Oscillator Operating Modes
Note:
CKSEL0
CC
), the CKDIV8 Fuse must be programmed in order to divide the internal frequency by 8 dur-
0
0
0
0
1
1
1
1
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1. The device is shipped with this option selected.
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
0010 - 0011
0100 - 0101
CKSEL3..0
SUT1..0
00
01
10
00
01
10
11
11
Start-up Time from
Power-down and
Power-save
160.
258 CK
258 CK
1K CK
1K CK
1K CK
16K CK
16K CK
16K CK
(2)
(2)
(2)
(1)
(1)
Additional Delay
CC
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 65 ms
14CK + 65 ms
14CK + 65 ms
(V
from Reset
and Temperature. When this Oscillator is used
CC
14CK
14CK
Nominal Frequency
= 5.0V)
8.0 MHz
4.0 MHz
(1)
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
enabled
rising power
slowly rising power
Crystal Oscillator, BOD
Crystal Oscillator, fast
Crystal Oscillator,
Table
6. If
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