RFM22 Datasheet, PDF (78/150 Pages) –

RFM22
Table 33. Interrupt or Status 2 Bit Set/Clear Description
Status
Bit
Name
Set/Clear Conditions
Goes high once the Sync Word is detected. Goes low once we are done
7
iswdet
receiving the current packet.
Goes high once the preamble is detected. Goes low once the sync is detected
6
ipreaval
or the RX wait for the sync times-out.
5
ipreainval Self cleaning, user should use this as an interrupt source rather than a status.
Should remain high as long as the RSSI value is above programmed threshold
4
irssi
level
3
iwut
Wake time timer interrupt. Use as an interrupt, not as a status.
Low Battery Detect. When a low battery event is been detected this bit will be
set to 1. This interrupt event is saved even if it is not enabled by the mask
2
ilbd
register bit and causes an interrupt after it is enabled. Probably the status is
cleared once the battery is replaced.
Module ready goes high once we enable the xtal, TX or RX and a settling time
1
ichiprdy
for the Xtal clock elapses. The status stay high unless we go back to Idle mode.
0
ipor
Power on status.
Table 34. Detailed Description of Status Registers when not Enabled as Interrupts
Status
Bit
Name
Set/Clear Conditions
Goes high once the Sync Word is detected. Goes low once we are done
7
iswdet
receiving the current packet.
Goes high once the preamble is detected. Goes low once the sync is detected
6
ipreaval
or the RX wait for the sync times-out.
5
ipreainval Self cleaning, user should use this as an interrupt source rather than a status.
Should remain high as long as the RSSI value is above programmed threshold
4
irssi
level
3
iwut
Wake time timer interrupt. Use as an interrupt, not as a status.
Low Battery Detect. When a low battery event is been detected this bit will be
set to 1. This interrupt event is saved even if it is not enabled by the mask
2
ilbd
register bit and causes an interrupt after it is enabled. Probably the status is
cleared once the battery is replaced.
Module ready goes high once we enable the xtal, TX or RX, and a settling time
1
ichiprdy
for the Xtal clock elapses. The status stay high unless we go back to Idle mode.
0
ipor
Power on status.
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