Rf12 – Rainbow Electronics RF12 User Manual
Page 21
RF12
10. TX Configuration Control Command
bit 15 14 13 12 11 10 9
8 7 6 5 4 3
2 1 0 POR
1 0 0 1 1 0 0
mp
m3
m2
m1
m0
0
p2
p1
p0 9800h
Bits 8-4 (mp, m3 to m0):
FSK modulation parameters:
The resulting output frequency can be calculated as:
f
out
= f
0
+ (-1)
SIGN
* (M + 1) * (15 kHz)
where:
f
0
is the channel center frequency (see the Frequency Setting Command)
M is the four bit binary number
SIGN = (mp) XOR (FSK input)
Bits 2-0 (p2 to p0): Output power:
p2 p1 p0 Relative Output Power [dB]
0 0 0
0
0 0 1
-3
0 1 0
-6
0 1 1
-9
1 0 0
-12
1 0 1
-15
1 1 0
-18
1 1 1
-21
The output power given in the table is relative to the maximum available power, which depends on the
actual antenna impedance.
11. Transmitter Register Write Command
bit 15 14 13 12 11 10
9
8
7 6 5 4
3 2 1 0 POR
1 0 1 1 1 0 0
0
t7
t6
t5
t4
t3
t2
t1
t0
B8AAh
With this command, the controller can write 8 bits (t7 to t0) to the transmitter data register. Bit 7 (el) must
be set in Configuration Setting Command.
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