ATtiny20 Atmel Corporation, ATtiny20 Datasheet - Page 21

• Manufacturer Part Number: ATtiny20
• Manufacturer: Atmel Corporation

Specifications of ATtiny20

• Flash (kbytes): 2 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 5
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Self Program Memory: NO
• 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: 3
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

6.4.2
6.4.3
8235B–AVR–04/11
Starting from Power-Down Mode
Starting from Idle / ADC Noise Reduction / Standby Mode
Table 6-1.
Notes:
When waking up from Power-Down sleep mode, the supply voltage is assumed to be at a suffi-
cient level and only the oscillator start-up time is counted to ensure the stable operation of the
oscillator. The oscillator start-up time is counted on the selected main clock, and the start-up
time depends on the clock selected. See
Table 6-2.
Notes:
When waking up from Idle, ADC Noise Reduction or Standby Mode, the oscillator is already run-
ning and no oscillator start-up time is introduced.
2. The second step is to count the oscillator start-up time, which ensures that the cali-
3. The last step before releasing the internal reset is to load the calibration and the config-
Reset
64 ms
voltage has reached sufficient levels. The reset start-up time is counted using the inter-
nal 128 kHz oscillator. See
Note that the actual supply voltage is not monitored by the start-up logic. The device
will count until the reset start-up time has elapsed even if the device has reached suffi-
cient supply voltage levels earlier.
brated internal oscillator has reached a stable state before it is used by the other parts
of the system. The calibrated internal oscillator needs to oscillate for a minimum num-
ber of cycles before it can be considered stable. See
oscillator start-up time.
uration values from the Non-Volatile Memory to configure the device properly. The
configuration time is listed in
1. After powering up the device or after a reset the system clock is automatically set to calibrated
2. When the Brown-out Detection is enabled, the reset start-up time is 128 ms after powering up
1. The start-up time is measured in main clock oscillator cycles.
2. When using software BOD disable, the wake-up time from sleep mode will be approximately
Oscillator start-up time
internal 8 MHz oscillator, divided by 8
the device.
60 µs.
Oscillator
6 cycles
Start-up Times when Using the Internal Calibrated Oscillator
Start-up Time from Power-Down Sleep Mode.
6 cycles
Configuration
21 cycles
Table 6-1
Table
6-1.
Table 6-2
Total start-up time
64 ms + 6 oscillator cycles + 21 system clock cycles
for details of reset start-up time.
for details.
Table 6-1
6 oscillator cycles
Total start-up time
for details of the
(1)(2)
ATtiny20
(1)(2)
21