RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 681 of 920
Dec 22, 2016
Figure 18 - 111 Relationship between Transmission Output Power and Gain Set (Frequency band identifier = 8)
(2) RF frequency setting for transmission
Following descriptions are detail of <2> frequency setting in 18.7.1 (1) Example of procedure for RF
transmission.
Set BBFREQ register (54) in 18.4.3 according to RF frequency of transmission.
If the frequency setting is integer times N (864 MHz, 912 MHz) of XIN frequency (48 MHz), the transmission
character will degrade. If the frequency matches the following condition, it must be changed to other
frequency. N is integer, h is modulation index in 2-level FSK and three times of modulation index in 4-level
FSK. R is symbol rate.
48e6 *N - (M2+1.5*R) ≤ Use prohibited transmission frequency [Hz] ≤ 48e6 *N + (M2+1.5*R)
Here, M2 = 3*R*(1+h)
Caution Refer to the latest application note for this setting when to use the product.
-20
-15
-10
-5
0
5
10
15
20
0 102030405060708090100110
Output power (dBm)
Gain Set
Output power characteristic
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