# Wake-Up Time

The following table shows wake-up time from various sleep modes with various system clock sources. It also shows the start-up time from reset with no Unified Programming Interface (UPDI) connection active and with 0 ms start-up time (SUT) setting.

Table 1. Start-Up and Wake-Up Time
Symbol Description Clock Source PDIV Division fCLK_CPU VDD Min. Typ. Max. Unit
tstartup The start-up time from the release of any Reset source. Execution of first instruction. (Excluding CRCSCAN) Any Any Any Any - 200 - µs
twakeup(1) Wake-up from Idle OSC20M FREQSEL = 0x2 1 20 MHz 5V - 1 -
2 10 MHz 3V - 2 -
4 5 MHz 2V - 4 -
OSC20M FREQSEL = 0x1 1 16 MHz 5V - 1.2 -
2 8 MHz 3V - 2.4 -
OSCULP32K 1 32.768 kHz 3V - 700 -
Wake-up time from Standby or Power-down when clock source is stopped OSC20M FREQSEL = 0x2 1 20 MHz 5V - 12 -
2 10 MHz 3V - 13 -
4 5 MHz 2V - 15 -
OSC20M FREQSEL = 0x1 1 16 MHz 5V - 16 -
2 8 MHz 3V - 15 -
OSCULP32K 1 32.768 kHz 3V - 750 -
Note:
1. 1.The wake-up time is the time from the wake-up request is given until the peripheral clock is available on the clock output (CLKOUT) pin. All peripherals and modules start execution from the first clock cycle, except the CPU that is halted for four clock cycles before program execution starts.
Figure 1. Wake-Up Time Definition