SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 41

• Manufacturer Part Number: SM1211E915TOPIC
• Description: KIT PICTAIL EXT FOR SX1211
• Manufacturer: Semtech
• Type: Transceiver, UHFr

Specifications of SM1211E915TOPIC

• Frequency: 915MHz
• For Use With/related Products: SX1211
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
5.3. Continuous Mode
Data
Datapath
5.3.1. General Description
5.3.2. Tx Processing
Tx/Rx
nd
Rx
, 2008
DATA (NRZ)
DCLK
SYNC
RECOG.
Figure 34: Continuous Mode Conceptual View
Figure 35: Tx Processing in Continuous Mode
SX1211
T_DATA
CONTROL
T_DATA
Page 41 of 92
CONFIG
SPI
NSS_CONFIG
MISO
SCK
MOSI
IRQ_0
IRQ_1(DCLK)
DATA
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SX1211