ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 32

• 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

System Control
and Reset
32
ATtiny26(L)
The ATtiny26(L) provides four sources of reset:
•
•
•
•
During reset, all I/O Registers are then set to their initial values, and the program starts execu-
tion from address $000. The instruction placed in address $000 must be an RJMP – Relative
Jump – instruction to the reset handling routine. If the program never enables an interrupt
source, the interrupt vectors are not used, and regular program code can be placed at these
locations. Figure 25 shows the reset logic for the ATtiny26(L). Table 16 shows the timing and
electrical parameters of the reset circuitry for ATtiny26(L).
Figure 25. Reset Logic for the ATtiny26(L)
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
threshold (V
External Reset. To use the PB7/RESET pin as an External Reset, instead of I/O pin, unprogram
(“1”) the RSTDISBL Fuse. The MCU is reset when a low level is present on the RESET pin for
more than 500 ns.
Watchdog Reset. The MCU is reset when the Watchdog timer period expires and the Watchdog is
enabled.
Brown-out Reset. The MCU is reset when the supply voltage V
threshold (V
BODLEVEL
BODEN
POT
BOT
).
).
CKSEL[3:0]
Reset Circuit
Brown-Out
Generator
Clock
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
CC
is below the Brown-out Reset
TIMEOUT
1477K–AVR–08/10