The external clock input pin of the MCU is XTAL1, however the iris has an external crystal hooked up there... This means that the clock output of the transceiver is not connected to the MCU.
Regarding power saving: The MCU will go to sleep if there the task queue is empty and no peripherals that require the MCU to be on are used. Typically, this is the case when the mote is idle and the transceiver is receiving. Note that the MCU is woken up at least four times per second (when the 1024Hz 8-bit timer overflows). Janos On Tue, Mar 10, 2009 at 11:04 AM, Carlos Gil Soriano <[email protected]> wrote: > Hi, > > > we have received a small quantity of IRIS motes and then we have started to > work with them. > > As the ATMEL AT86RF230 datasheet says, it is possible to set the CLKM of the > radio up as the clock of the microcontroller. In that case, if the radio is > in a reception state and the microcontroller is not running an application > is possible to power down the microcontroller but keep on the reception > state. If a new frame is received, the radio is able to wake up the > microcontroller. So, a power saving strategy could be implemented. > > In order to achive that, it is necessary to program CLKM with a correct > frecuency (such as 4MHz or 8MHz for IRIS mote). But looking up into the code > (HplRF230.h), I have found that TRX_CTRL_0_VALUE is set to 0 instead of 0x03 > or 0x04, for instance. With this configuration it is not possible to turn > off the microcontroller from the radio. > > Is it possible to configure that kind of operation? > > I also have tried to find out the schematics of IRIS so as to know if both > radio and microcontroller share CLKM, but I've found nothing. > > Is there any schematic of IRIS platform? > > > Regards, > Carlos > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
