RF31 Hope Microelectronics co., Ltd, RF31 Datasheet - Page 129

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

Register 74h. Frequency Offset 2
Reset value = 00000000
Register 75h. Frequency Band Select
Reset value = 01110101
The RF carrier frequency can be calculated as follows:
f
where parameters f
79h and 7Ah.
carrier
Name
Type
Bit
Name
= (f
Type
Bit
7:2
1:0
Bit
4:0
Bit
7
6
5
b
+24+(f
Tel: [phone]
Reserved
Reserved
Reserved
c
R
+f
D7
Name
fb[4:0]
hbsel
fo[9:8]
sbse
Name
o
D7
) / 64000) x 10000 x (hbsel+1) + (f
c
, f
o
, f
b
and hb_sel come from registers 73h–77h. Parameters f
Reserved.
Side Band Select.
High Band Select.
Setting hbsel = 1 will choose the frequency range from 480–930 MHz (high bands). Setting
hbsel = 0 will choose the frequency range from 240–479.9 MHz (low bands).
Frequency Band Select.
Every increment corresponds to a 10 MHz Band for the Low Bands and a 20 MHz Band
for the High Bands. Setting fb[4:0] = 00000 corresponds to the 240–250 MHz Band for
hbsel = 0 and the 480–500 MHz Band for hbsel = 1. Setting fb[4:0] = 00001 corresponds
to the 250–260 MHz Band for hbsel = 0 and the 500–520 MHz Band for hbsel = 1.
sbsel
R/W
D6
Reserved.
Upper Bits of the Frequency Offset Setting.
fo[9] is the sign bit. The frequency offset can be calculated as Offset = 156.25 Hz x
(hbsel + 1) x fo[7:0]. fo[9:0] is a twos complement value. Reading from this register
will give the AFC correction last results, not this register value.
D6
Fax: [phone]
hbsel
D5
R/W
D5
Reserved
R
hch
D4
D4
x f
hs
E-mail: [e-mail]
x 10) [kHz],
Function
Function
D3
D3
fb[4:0]
R/W
D2
D2
hch
and f
http://www.hoperf.com
hs
come from register
D1
R F 3 1
D1
fo[9:8]
R/W
D0
D0
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