MRF39RA Datasheet, PDF (24/72 Pages) Microchip Technology – Low-Power, Integrated UHF Receiver

MRF39RA
3.3.2 Criteria
The criteria taken for detecting a wanted signal and
hence deciding to maintain the receiver on is defined
by ListenCriteria in RegListen1.
TABLE 3-3:
SIGNAL ACCEPTANCE
CRITERIA IN LISTEN MODE
ListenCriteria Input Signal Power SyncAddressMatch
 RssiThreshold
0
Required
Not Required
1
Required
Required
3.3.3 End of Cycle Actions
The action taken after detection of a packet is defined
by ListenEnd in RegListen3 as described in Table 3-4.
TABLE 3-4:
ListenEnd
END OF LISTEN CYCLE ACTION
Description
00
Chip stays in Rx mode. Listen mode stops and must be disabled.
01
Chip stays in Rx mode until PayloadReady or Time-out interrupt occurs. It then goes to the
mode defined by Mode. Listen mode stops and must be disabled.
10
Chip stays in Rx mode until PayloadReady or Time-out interrupt occurs. Listen mode then
resumes in Idle state. FIFO content is lost at next Rx wake-up.
Upon detection of a valid packet, the sequencing is
altered as shown in Figure 3-5.
FIGURE 3-5:
LISTEN MODE SEQUENCE (WANTED SIGNAL IS RECEIVED)
PayloadReady
ListenCriteria
passed
ListenEnd = 00
Idle
Rx
Listen Mode
ListenEnd = 01
Idle
Rx
Listen Mode
Mode
ListenEnd = 10
Idle
Rx
Listen Mode
Listen mode can be disabled by writing ListenOn to ‘0’.
DS40001778B-page 24
Idle
Rx
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