SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 36

• 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

Table 15: Config vs. Data SPI Interface Selection
The following paragraphs describe how to use each of these interfaces.
To write a value into a configuration register the timing diagram below should be carefully followed by the uC.
The register’s new value is effective from the rising edge of NSS_CONFIG.
Note that when writing more than one register successively, it is not compulsory to toggle NSS_CONFIG back high
between two write sequences. The bytes are alternatively considered as address and value. In this instance, all
new values will become effective on rising edge of NSS_CONFIG.
To read the value of a configuration register the timing diagram below should be carefully followed by the uC.
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
NSS_CONFIG (In)
SCK (In)
MOSI (In)
MISO (Out)
Write Register
Read Register
NSS_DATA
0
0
1
1
nd
(input)
, 2008
HZ
* when writing the new value at address A1, the current content of A1 can be read by the uC.
5.2.1.2. SPI Config
NSS_CONFIG
0
1
0
1
start
1
x
rw
2
x
A(4) A(3) A(2) A(1)
3
x
SPI Interface
Config
Data
Config
None
Address = A1
4
x
Figure 27: Write Register Sequence
(In)/(Out) refers to SX1211 side
5
x
6
x
A(0)
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7
x
stop
8
x
D(7) D(6) D(5) D(4) D(3) D(2) D(1)
D(7) D(6) D(5) D(4) D(3) D(2) D(1) D(0)
9
10
11
Current value at
New value at
address A1
address A1*
12
13
14
15
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16
D(0)
SX1211
(input)
HZ