C2510Fx / CC2511Fx
; Transmit the following data: 0x02, 0x12, 0x34
; (Assume that the radio has already been configured, the high speed
; crystal oscillator is selected as system clock, and CLKCON.CLKSPD=000)
C1:
C2:
C3:
MOV
JNB
CLR
MOV
JNB
CLR
MOV
JNB
CLR
MOV
RFST,#03H
RFTXRXIE,C1
RFTXRXIE
RFD,#02H
RFTXRXIE,C2
RFTXRXIE
RFD,#12H
RFTXRXIE,C3
RFTXRXIE
RFD,#34H
;
;
;
;
;
;
;
;
;
;
;
Start TX with STX command strobe
Wait for interrupt flag telling radio is
ready to accept data, then write first
data byte to radio (packet length = 2)
Wait for radio
Send first byte in payload
Wait for radio
Send second byte in payload
Done
Figure 48: Simple RF Transmit Example
14.5 Data Rate Programming
The data rate used when transmitting, or the
data rate expected in receive is programmed
by
the
and
the
configuration registers.
The data rate is given by the formula below.
⎢
⎛
R
DATA
⋅
2
20
⎞⎥
⎟⎥
DRATE
_
E
= ⎢
log
2
⎜
⎟⎥
⎜
f
ref
⎢
⎠⎦
⎝
⎣
R
DATA
⋅
2
28
DRATE
_
M
=
−
256
f
ref
⋅
2
DRATE
_
E
If
is rounded to the nearest integer
and becomes 256, increment
and
use
R
DATA
(
256
+
DRATE
_
M
)
⋅
2
DRATE
_
E
⋅
f
=
2
28
ref
The following approach can be used to find
suitable values for a given data rate:
14.6 Receiver Channel Filter Bandwidth
In order to meet different channel width
requirements, the receiver channel filter is
programmable. The
and
configuration registers
control the receiver channel filter bandwidth.
The following formula gives the relation
between the register settings and the channel
filter bandwidth:
be subtracted from the signal bandwidth. The
following example illustrates this:
With the channel filter bandwidth set to 600
kHz, the signal should stay within 80% of 600
kHz, which is 480 kHz. Assuming 2.44 GHz
frequency and ±20 ppm frequency uncertainty
for both the transmitting device and the
receiving
device,
the
total
frequency
uncertainty is ±40 ppm of 2.44 GHz, which is
±98 kHz. If the whole transmitted signal
bandwidth is to be received within 480 kHz, the
transmitted signal bandwidth should be
maximum 480 kHz – 2·98 kHz, which is 284
kHz.
The
CC2510Fx/CC2511Fx
supports channel filter
bandwidths shown in Table 62 and Table 63
respectively.
BW
channel
=
f
ref
8
⋅
(4
+
CHANBW
_
M
)·2
CHANBW
_
E
For best performance, the channel filter
bandwidth should be selected so that the
signal bandwidth occupies at most 80% of the
channel filter bandwidth. The channel centre
tolerance due to crystal accuracy should also
SWRS055D
Page 192 of 243
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