XBIB-U【PDF 23/72 页】BOARD USB ZIGBEE MOD PRO

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XBee/XBeePRO"燨EM燫F燤odules??02.15.4?爒1.xAx燵2007.05.031]

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Chapter??燫F燤odule燨peration

Pin Doze (SM = 2)

"Pin/Host-controlled

" Typical power-down current: < 50 礎

" Wake-up time: 2 msec

Pin Doze Mode functions as does Pin Hibernate Mode; however, Pin Doze features faster wake-up

time and higher power consumption.

To wake a sleeping module operating in Pin Doze 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.

Cyclic Sleep Modes

Cyclic Sleep Remote (SM = 4)

" Typical Power-down Current: < 50 礎 (when asleep)

" Wake-up time: 2 msec

The Cyclic Sleep Modes allow modules to periodically check for RF data. When the SM parameter is

set to 4, the module is configured to sleep, then wakes once a cycle to check for data from a

module configured as a Cyclic Sleep Coordinator (SM = 0, CE = 1). The Cyclic Sleep Remote sends

a poll request to the coordinator at a specific interval set by the SP (Cyclic Sleep Period) parame-

ter. The coordinator will transmit any queued data addressed to that specific remote upon receiv-

ing the poll request.

If no data is queued for the remote, the coordinator will not transmit and the remote will return to

sleep for another cycle. If queued data is transmitted back to the remote, it will stay awake to

allow for back and forth communication until the ST (Time before Sleep) timer expires.

Also note that CTS

will go low each time the remote wakes, allowing for communication initiated

by the remote host if desired.

Cyclic Sleep Remote with Pin Wake-up (SM = 5)

Use this mode to wake a sleeping remote module through either the RF interface or by the de-

assertion of Sleep_RQ for event-driven communications. The cyclic sleep mode works as described

above (Cyclic Sleep Remote) with the addition of a pin-controlled wake-up at the remote module.

The Sleep_RQ pin is edge-triggered, not level-triggered. The module will wake when a low is

detected then set CTS

low as soon as it is ready to transmit or receive.

Any activity will reset the ST (Time before Sleep) timer so the module will go back to sleep only

after there is no activity for the duration of the timer. Once the module wakes (pin-controlled),

further pin activity is ignored. The module transitions back into sleep according to the ST time

regardless of the state of the pin.

[Cyclic Sleep Coordinator (SM = 6)]

" Typical current = Receive current

" Always awake

NOTE: The SM=6 parameter value exists solely for backwards compatibility with firmware version

1.x60. If backwards compatibility with the older firmware version is not required, always use the CE

(Coordinator Enable) command to configure a module as a Coordinator.

This mode configures a module to wake cyclic sleeping remotes through RF interfacing. The Coor-

dinator will accept a message addressed to a specific remote 16 or 64-bit address and hold it in a

buffer until the remote wakes and sends a poll request. Messages not sent directly (buffered and

requested) are called "Indirect messages". The Coordinator only queues one indirect message at a

time. The Coordinator will hold the indirect message for a period 2.5 times the sleeping period

indicated by the SP (Cyclic Sleep Period) parameter. The Coordinator's SP parameter should be set

to match the value used by the remotes.

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