RF31 Hope Microelectronics co., Ltd, RF31 Datasheet - Page 90

• Manufacturer Part Number: RF31
• Description: Rf31 Ism Receiver
• Manufacturer: Hope Microelectronics co., Ltd

Register 1Fh. Clock Recovery Gearshift Override
Reset value = 00000011
The gear-shift register controls BCR loop gain. Before the preamble is detected, BCR loop gain is as follows:
Once the preamble is detected, internal state machine automatically shift BCR loop gain to the following:
crfast = 3‘b000 and crslow = 3‘b101 are recommended for most applications. The value of ―crslow‖ should be
greater than ―crfast‖.
Name
Type
Bit
5:3
2:0
Bit
7
6
Tel: [phone]
Reserved
crslow[2:0]
Reserved
crfast[2:0]
R/W
D7
rxready
Name
rxready
R/W
D6
Reserved.
Improves Receiver Noise Immunity when in Direct Mode.
It is recommended to set this bit after preamble is detected. When in FIFO
mode this bit should be set to ―0‖ since noise immunity is controlled
automatically.
Clock Recovery Fast Gearshift Value.
Clock Recovery Slow Gearshift Value.
Fax: [phone]
D5
BCRLoopGain =
BCRLoopGain =
crfast[2:0]
R/W
D4
E-mail: [e-mail]
2 crfast
crgain
crgain
2
crslow
Function
D3
D2
http://www.hoperf.com
crslow[2:0]
R/W
D1
R F 3 1
D0
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