ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 25

• 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

Clock Sources
1477K–AVR–08/10
The device has the following clock source options, selectable by Flash Fuse bits as shown
below on Table 3. The clock from the selected source is input to the AVR clock generator, and
routed to the appropriate modules.The use of pins PB5 (XTAL2), and PB4 (XTAL1) as I/O pins is
limited depending on clock settings, as shown below in Table 4.
Table 3. Device Clocking Options Select
Table 4. PB5, and PB4 Functionality vs. Device Clocking Options
Note:
The various choices for each clocking option is given in the following sections. When the CPU
wakes up from Power-down, the selected clock source is used to time the start-up, ensuring sta-
ble oscillator operation before instruction execution starts. When the CPU starts from Reset,
there is as an additional delay allowing the power to reach a stable level before commencing
normal operation. The Watchdog Oscillator is used for timing this real-time part of the start-up
time. The number of WDT Oscillator cycles used for each time-out is shown in Table 5. The fre-
Device Clocking Option
External Crystal/Ceramic Resonator
External Low-frequency Crystal
External RC Oscillator
Calibrated Internal RC Oscillator
External Clock
PLL Clock
Device Clocking Option
External Clock
Internal RC Oscillator
Internal RC Oscillator
Internal RC Oscillator
Internal RC Oscillator
External RC Oscillator
External RC Oscillator
External RC Oscillator
External RC Oscillator
External Low-frequency Oscillator
External Crystal/Resonator Oscillator
External Crystal/Resonator Oscillator
External Crystal/Resonator Oscillator
External Crystal/Resonator Oscillator
External Crystal/Resonator Oscillator
External Crystal/Resonator Oscillator
PLL
1. For all fuses “1” means unprogrammed while “0” means programmed.
PLLCK
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
CKSEL [3:0]
PLLCK
0000
0001
0010
0100
0101
1000
1001
1010
0001
0011
0110
1011
1100
1101
1110
0111
1111
1
1
1
1
1
0
(1)
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
XTAL1
PB4
I/O
I/O
I/O
I/O
I/O
1000 - 0101
0100 - 0001
1111 - 1010
CKSEL3..0
1001
0000
0001
XTAL2
XTAL2
XTAL2
XTAL2
XTAL2
XTAL2
XTAL2
PB5
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
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