CC2510FX Datasheet, PDF (196/253 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

CC2510Fx / CC2511Fx
; Start radio TX
; simple example, assumes required frequency, modulation format and
; data rate has been set in RF registers
;
MOV DPTR,PA_TABLE0
;setting PA output power
MOV A,#0FFh
;
MOVX @DPTR,A
;
MOV CLKCON,#00H
;select 26 MHz XOSC
MOV RFST,#03H
;start TX with STX command strobe
C1: JNB IE0,C1
;wait for interrupt flag telling radio is
CLR IE0
;ready to accept data, then write
MOV RFD,#02H
;first data to radio, packet length=2
C2: JNB IE0,C2
;wait for radio
CLR IE0
;
MOV RFD,#12H
;send first byte in payload
C3: JNB IE0,C3
;wait for radio
CLR IE0
;
MOV RFD,#34H
;send second byte in payload
;done
Figure 45: Simple RF transmit example
15.5 Data Rate Programming
The data rate used when transmitting, or
the data rate expected in receive is
programmed by the MDMCFG3.DRATE_M
and the MDMCFG4.DRATE_E configuration
registers. The data rate is given by the
formula below. As the formula shows, the
programmed data rate depends on the
crystal frequency.
( ) _{RDATA =}
256 + DRATE _ M
2²⁸
⋅ 2^{DRATE _ E} _{⋅ f XOSC}
The following approach can be used to
find suitable values for a given data rate:
DRATE
_
E
=
⎢
⎢^log
⎢⎣
2
⎜⎜⎝⎛
R_DATA ⋅ 2 ²⁰
f _XOSC
⎟⎟⎠⎞⎥⎥⎦⎥
DRATE _ M = ^{RDATA ⋅ 228} − 256
f _XOSC ⋅ 2 ^{DRATE _ E}
If DRATE_M is rounded to the nearest
integer and becomes 256, increment
DRATE_E and use DRATE_M=0.
The data rate can be set from 1.2 kbps to
500 kbps with the minimum step size as
shown in Table 57.
Data rate
start
0.8 kbps
3.17 kbps
6.35 kbps
12.7 kbps
25.4 kbps
50.8 kbps
101.6 kbps
203.1 kbps
406.3 kbps
Typical
data rate
1.2 / 2.4
kbps
4.8 kbps
9.6 kbps
19.6 kbps
38.4 kbps
76.8 kbps
153.6 kbps
250 kbps
500 kbps
Data rate
stop
3.17 kbps
6.35 kbps
12.7 kbps
25.4 kbps
50.8 kbps
101.6 kbps
203.1 kbps
406.3 kbps
500 kbps
Data rate
step size
0.0062 kbps
0.0124 kbps
0.0248 kbps
0.0496 kbps
0.0992 kbps
0.1984 kbps
0.3967 kbps
0.7935 kbps
1.5869 kbps
Table 57: Data rate step size
CC2510Fx/CC2511Fx PRELIMINARY Data Sheet (Rev. 1.2) SWRS055A Page 196 of
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