SM1212E433 Semtech, SM1212E433 Datasheet - Page 41

• Manufacturer Part Number: SM1212E433
• Description: RF Module For SX1212
• Manufacturer: Semtech
• Series: -r
• Type: Transceiver, ISMr

Specifications of SM1212E433

• Frequency: 433MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: SX1212E

As illustrated in Figure 34, in Continuous mode the NRZ data to (from) the (de)modulator is directly accessed by
the uC on the bidirectional DATA pin (20). The SPI Data, FIFO and packet handler are thus inactive.
In Tx mode, a synchronous data clock for an external uC is provided on IRQ_1 pin. Its timing with respect to the
data is illustrated in Figure 35. DATA is internally sampled on the rising edge of DCLK so the uC can change logic
state anytime outside the greyed out setup/hold zone.
The use of DCLK is compulsory in FSK and optional in OOK.
Rev 2 – June 18th, 2009
ADVANCED COMMUNICATIONS & SENSING
5.3. Continuous Mode
Data
5.3.1. General Description
5.3.2. Tx Processing
Datapath
Tx/Rx
Rx
DATA (NRZ)
DCLK
SYNC
RECOG.
Figure 34: Continuous Mode Conceptual View
Figure 35: Tx Processing in Continuous Mode
T_DATA
SX1212
T_DATA
CONTROL
Page 41 of 77
CONFIG
SPI
NSS_CONFIG
MISO
SCK
MOSI
IRQ_0
IRQ_1(DCLK)
DATA
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