XE1205
Figure 17 shows the write operation during transmit.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCK
MOSI
D1(7) D1(6)
D1(5)
D1(4) D1(3)
x
D1(2)
D1(1)
D1(0)
D2(7)
D2(6)
D2(5)
D2(4)
D2(3) D2(2)
D2(1)
D2(0)
Byte 1 to
read
Byte 2
to read
MISO
HZ
x
x
x
x
x
x
x
x
HZ
x
x
x
x
x
x
x
x
x
HZ
NSS_DATA
Figure 17 Writing 2 bytes in transmitter mode
Figure 18 shows the read operation in receive mode.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCK
MOSI
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Byte 1 to
read
Byte 2
to read
MISO
HZ
D1(7)
D1(6) D1(5)
D1(4) D1(3)
D1(2) D1(1) D1(0)
HZ
D2(7) D2(6)
D2(5)
D2(4)
D2(3)
D2(2)
D2(1)
D2(0)
HZ
NSS_DATA
Figure 18: Reading 2 bytes in receive mode.
Note that it is necessary to toggle NSS_DATA signal back to high and then back to low between each
transmitted and received byte.
? Semtech 2008
27
www.semtech.com
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