ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 28

• Manufacturer Part Number: ATtiny26
• Manufacturer: Atmel Corporation

Specifications of ATtiny26

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 11
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• 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: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

External RC
Oscillator
28
ATtiny26(L)
For timing insensitive applications, the external RC configuration shown in Figure 23 can be
used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least 22
pF. By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between
XTAL1 and GND, thereby removing the need for an external capacitor.
Figure 23. External RC Configuration
The oscillator can operate in four different modes, each optimized for a specific frequency range.
The operating mode is selected by the fuses CKSEL3..0 as shown in Table 9.
Table 9. External RC Oscillator Operating Modes
When this oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 10.
Table 10. Start-up Times for the External RC Oscillator Clock Selection
Notes:
SUT1..0
00
01
10
11
1. This option should not be used when operating close to the maximum frequency of the device.
from Power-down
Start-up Time
CKSEL3..0
6 CK
18 CK
18 CK
18 CK
0101
1000
0110
0111
(1)
Additional Delay from
Reset (V
R
C
V
CC
4.1 ms
4.1 ms
65 ms
CC
–
= 5.0V)
PB5 (XTAL2)
XTAL1
GND
Frequency Range (MHz)
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Fast rising power or BOD enabled
8.0 - 12.0
0.1 - 0.9
0.9 - 3.0
3.0 - 8.0
1477K–AVR–08/10