ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 21

• Manufacturer Part Number: ATTINY20-XU
• Description: MCU AVR 2KB FLASH 12MHZ 14TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-XU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Processor Series: ATtiny
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI, TWI
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

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