ALPHA RF T
RANSCEIVER
Transmitter Register Write Command
bit
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1
1
1
0
0
0
t7
t6
t5
t4
t3
t2
This command is use to write a data byte to RF12 and then RF12 transmit it
1
t1
ALPHA-TRX433S
ALPHA-TRX915S
0
t0
POR
B8AAh
Wake-Up Timer Command
bit
15
1
14
1
13
1
12
r4
11
r3
10
r2
9
r1
8
r0
7
m7
6
m6
5
m5
4
m4
3
m3
2
m2
1
m1
0
m0
POR
E196h
The wake-up period is determined by:
R
T
wake-up
= M * 2 [ms]
For continual operation, bit ‘et’ must be cleared and set
Low Duty-Cycle Command
bit
15
1
14
1
13
0
12
0
11
1
10
0
9
0
8
0
7
d6
6
d5
5
d4
4
d3
3
d2
2
d1
1
d0
0
en
POR
C8OEh
d6..d0: Set duty cycle
D.C.= (D * 2 +1) / M *100%
En: Enable low duty cycle mode
Low Battery Detector and Microcontroller Clock Divider Command
bit
15
1
14
1
13
0
12
0
11
0
10
0
9
0
8
0
7
d2
6
d1
5
d0
4
0
3
v3
2
v2
1
v1
0
v0
POR
C000h
d2..d0: select frequency of CLK pin
d2
0
0
0
0
1
1
1
1
d1
0
0
1
1
0
0
1
1
d0
0
1
0
1
0
1
0
1
Clock frequency[MHz]
1
1.25
1.66
2
2.5
3.33
5
10
CLK signal is derive form crystal oscillator and it can be applied to MCU clock in to save a second
crystal.
If not used, please set bit “dc” to disable CLK output
To integrate the load capacitor internal can not only save cost, but also adjust reference frequency
by software
DSALPHA-TRX-6
Feb ‘11
©2009
RF Solutions Ltd.
：
v3..v0: Set threshold voltage of Low battery detector
Vlb=2.2+V*0.1 [V]
Page 11
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