RFM95 datasheet(62/121 Pages) HOPERF

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Page 62

RFM95/96/97/98(W)

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WIRELESS & SENSING

PRELIMINARY

DATASHEET

FifoLevel

B+1

# of bytes in FIFO

Figure 27. FifoLevel IRQ Source Behavior

Notes - FifoLevel interrupt is updated only after a read or write operation on the FIFO. Thus the interrupt cannot be

dynamically updated by only changing the FifoThreshold parameter

- FifoLevel interrupt is valid as long as FifoFull does not occur. An empty FIFO will restore its normal operation

FIFO Clearing

Table below summarizes the status of the FIFO when switching between different modes

Table 73 Status of FIFO when Switching Between Different Modes of the Chip

From

FIFO status

Comments

Stdby

Sleep

Not cleared

Sleep

Stdby

Not cleared

Stdby/Sleep

Not cleared

To allow the user to write the FIFO in Stdby/Sleep before Tx

Stdby/Sleep

Cleared

Stdby/Sleep

Not cleared

To allow the user to read FIFO in Stdby/Sleep mode after Rx

Any

Cleared

4.2.10.1. Sync Word Recognition

Overview

Sync word recognition (also called Pattern recognition) is activated by setting SyncOn in RegSyncConfig. The bit

synchronizer must also be activated in Continuous mode (automatically done in Packet mode).

The block behaves like a shift register; it continuously compares the incoming data with its internally programmed Sync

word and sets SyncAddressMatch when a match is detected. This is illustrated in Figure 28 below.

RFM95 Datasheet(PDF) 62 Page - Shenzhen Hope Microelectronics Co., Ltd.