MRF24J40_08 Datasheet, PDF (122/152 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
Nonbeacon-Enabled (Coordinator or Device) mode –
Figure 3-19 shows the Sleep time line for Non-
beacon-Enabled (Coordinator or Device) mode. In this
mode, the host processor puts the MRF24J40 to Sleep
by setting the STARTCNT (0x229<7>) bit. At the end of
the Sleep interval, the MRF24J40 alerts the host
processor with a wake-up alert interrupt (0x31<6>).
Sleep Interval = (MAINCNT * SLPCLK Period) –
WAKETIME + [(REMCNT * 50 ns)/2]
FIGURE 3-19:
NONBEACON-ENABLED (COORDINATOR OR DEVICE) SLEEP TIME LINE
Time
Wake-up Alert Interrupt
WAKEIF (0x31<6>)
Remain
Counter
Counts
Main Counter Counts
20 MHz Main Oscillator
Turned OFF
WAKETIME = MAINCNT
20 MHz Main Oscillator
Turned ON
Wake Counter
Counts (~2 ms)
Remain
Counter
Counts
20 MHz Main
Oscillator Stable
Low-Current
Sleep Period
DS39776B-page 120
Preliminary
© 2008 Microchip Technology Inc.