> 3.6 | Power Saving

> Intended for power saving, SLEEP mode reduces the functionality of the TC65 to a minimum and thus minimizes the current consumption. Settings can be made using the AT+CFUN com mand. For details see [1]. SLEEP mode falls in two categories:

> • | NON-CYCLIC SLEEP mode: AT+CFUN = 0

> • | CYCLIC SLEEP modes, AT+CFUN = 7 or 9.

> The functionality level AT+CFUN=1 is where power saving is switched off. This is the default after startup.
> NON-CYCLIC SLEEP mode permanently blocks the serial interface. The benefit of the CYCLIC SLEEP mode is that the serial interface remains accessible and that, in intermittent wake-up periods, characters can be sent or received without terminating the selected mode. This allows the TC65 to wake up for the duration of an event and, afterwards, to resume power saving. Please refer to [1] for a summary of all SLEEP modes and the different ways of waking up the module.
> For CYCLIC SLEEP mode both the TC65 and the application must be configured to use hardware flow control. This is necessary since the CTSx signal is set/reset every 0.9-2.7 seconds in order to indicate to the application when the UART is active. Please refer to [1] for details on how to configure hardware flow control for the TC65.
> Note: Although not explicitly stated, all explanations given in this section refer equally to ASC0 and ASC1, and accordingly to CTS0 and CTS1 or RTS0 and RTS1.