ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 35

• 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

Brown-out
Detection
Watchdog Reset
1477K–AVR–08/10
ATtiny26(L) has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
ing the operation. The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD
is enabled (BODEN programmed), and V
Reset is immediately activated. When V
Reset is deactivated after a delay. The delay is defined by the user in the same way as the delay
of POR signal, in Table 29. The trigger level for the BOD can be selected by the fuse
BODLEVEL to be 2.7V (BODLEVEL unprogrammed), or 4.0V (BODLEVEL programmed). The
trigger level has a hysteresis of 50 mV to ensure spike free Brown-out Detection.
The BOD circuit will only detect a drop in V
ger than t
Figure 29. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 78 for details on operation of the Watchdog.
Figure 30. Watchdog Time-out
INTERNAL
TIME-OUT
RESET
RESET
BOD
V
CC
given in Table 16.
V
BOT-
1 CK Cycle
CC
CC
CC
increases above the trigger level, the Brown-out
decreases below the trigger level, the Brown-out
if the voltage stays below the trigger level for lon-
V
t
TOUT
BOT+
TOUT
CC
. Refer to
level dur-
35