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NRF24LE1 Power down mode

Hi, i try to understand how to use power down modes. But i have a problem in the example (nRF24LE1 REGISTER RETENTION TIMER ON).

while(1)
{
// Register retention mode
PWRDWN = 0x04;
// Standby mode (wait for interrupt)
PWRDWN = 0x07;
// Clear PWRDWN
PWRDWN = 0x00;
// Continue to run code
P03 = !P03; 
};

I would like to ask why after the chip enters register retention mode, we need standby mode. Thanks...

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