SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 37
SM1211E915TOPIC
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
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Note that when reading more than one register successively, it is not compulsory to toggle NSS_CONFIG back
high between two read sequences. The bytes are alternatively considered as address and value.
To write bytes into the FIFO the timing diagram below should be carefully followed by the uC.
Note that it is compulsory to toggle NSS_DATA back high between each byte written.
The byte is pushed into the FIFO on the rising edge of NSS_DATA
Rev 7 – Sept 2
NSS_CONFIG (In)
SCK (In)
MOSI (In)
MISO (Out)
ADVANCED COMMUNICATIONS & SENSING
Write Byte (before/during Tx)
SCK (In)
MOSI (In)
MISO (Out)
NSS_DATA (In)
HZ
(input)
nd
, 2008
HZ
(input)
5.2.1.3. SPI Data
start
1
x
x
D1(7)
1
rw
D1(6) D1(5) D1(4)
2
x
2
x
A(4) A(3) A(2) A(1)
3
x
3
x
Figure 29: Write Bytes Sequence (ex: 2 bytes)
1
st
4
x
Address = A1
byte written
4
x
x
Figure 28: Read Register Sequence
D1(3) D1(2) D1(1)
5
x
5
x
6
x
6
x
7
x
A(0)
Page 37 of 92
7
D1(0)
x
8
x
stop
8
(input)
x
HZ
D(7) D(6) D(5) D(4) D(3) D(2) D(1)
x
9
D2(7) D2(6) D2(5)
x
1
10
x
2
x
11
x
3
x
Current value at
address A1
2
nd
D2(4)
12
x
4
x
byte written
D2(3) D2(2) D2(1)
5
x
13
x
6
x
14
x
7
x
15
x
D2(0)
8
x
www.semtech.com
SX1211
16
D(0)
x
x
HZ
(input)
HZ
(input)
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