CC1020RSSR Datasheet, PDF (27/92 Pages) Texas Instruments – Low-Power RF Transceiver for Narrowband Systems

CC1020
Transmitter side:
DCLK
DIO
“RF”
DCLK is not used in transmit mode, and is
used as data output in receive mode. It can be
set to default high or low in transmit mode.
Data provided by UART (TXD)
FSK modulating signal,
internal in CC1020
Receiver side:
“RF”
DCLK
DIO
Demodulated signal (NRZ),
internal in CC1020
DCLK is used as data output
provided by CC1020.
Connect to UART (RXD)
DIO is not used in receive mode. Used only
as data input in transmit mode
Figure 11. Transparent Asynchronous UART mode (SEP_DI_DO = 1)
1 0 1 10 0 0 1 101
Tx
data
Time
Figure 12. Manchester encoding
10. Data Rate Programming
The data rate (baud rate) is programmable
and depends on the crystal frequency and
the programming of the CLOCK
(CLOCK_A and CLOCK_B) registers.
The baud rate (B.R) is given by
B.R. 
f _xosc
8  (REF _ DIV  1)  DIV1 DIV 2
where DIV1 and DIV2 are given by the
value of MCLK_DIV1 and MCLK_DIV2.
Table 17 shows some possible data rates
as a function of crystal frequency in
synchronous mode. In asynchronous
transparent UART mode any data rate up
to 153.6 kBaud can be used.
MCLK_DIV2[1:0]
00
01
10
11
DIV2
1
2
4
8
Table 15. DIV2 for different settings of
MCLK_DIV2
MCLK_DIV1[2:0]
000
001
010
011
100
101
110
111
DIV1
2.5
3
4
7.5
12.5
40
48
64
Table 16. DIV1 for different settings of
MCLK_DIV1
SWRS046F
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