SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
5.4. Continuous Mode
5.4.1. General Description
As illustrated in Figure 29, in Continuous mode the NRZ data to (from) the (de)modulator is directly accessed by the uC on
the bidirectional DIO2/DATA pin. The FIFO and packet handler are thus inactive.
Tx/Rx
CONTROL
DIO0
DIO1/DCLK
DIO2/DATA
DIO3
DIO4
DIO5
Data
Rx
SYNC
RECOG.
SPI
NSS
SCK
MOSI
MISO
Figure 29. Continuous Mode Conceptual View
5.4.2. Tx Processing
In Tx mode, a synchronous data clock for an external uC is provided on DIO1/DCLK pin. Clock timing with respect to the
data is illustrated in Figure 30. DATA is internally sampled on the rising edge of DCLK so the uC can change logic state
anytime outside the grayed out setup/hold zone.
T_DATA
T_DATA
DATA
(NRZ)
DCLK
Figure 30. Tx Processing in Continuous Mode
Note
the use of DCLK is required when the modulation shaping is enabled (see section 3.4.5).
Rev. 7 - June 2013
Page 51
www.semtech.com
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