MRF24J40-I/ML(2010) 查看數據表（PDF） - Microchip Technology

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MRF24J40-I/ML
(Rev.:2010)

IEEE 802.15.4™ 2.4 GHz RF Transceiver

Microchip Technology 

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>).

EQUATION 3-4:

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

DS39776C-page 124

Preliminary

© 2010 Microchip Technology Inc.

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