Pin Sleep SM1/2 Confusion

XBee & XBee Gateway XBee - 802.15.4
1

In the manual it says:
/*

To wake a sleeping module operating in Pin Hibernate Mode, de-assert Sleep_RQ (pin 9). The
module will wake when Sleep_RQ is de-asserted and is ready to transmit or receive when the CTS
line is low. When waking the module, the pin must be de-asserted at least two ‘byte times’ after
CTS goes low. This assures that there is time for the data to enter the DI buffer.

*/
which sounds to me like it’s saying you de-assert the sleep pin, and wait for CTS. but you have to wait for CTS before you de-assert the sleep pin. Can anyone explain this to me?

Steve

2

Yes, that is a bit confusing the way its worded. My understanding is that you need to hold pin 9 (Sleep_RQ) low at least two byte-times AFTER CTS has gone low for the module to awaken.

3

In order to wake a sleeping module in SM1, the Sleep_RQ must first be de-asserted, then at least after two ‘byte times’ can the module send something while need more tine receive something.