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L9966 Datasheet(PDF) 53 Page - STMicroelectronics

Part # L9966
Description  FlexInput IC for automotive applications
PDF  122 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9966 Datasheet(HTML) 53 Page - STMicroelectronics

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13.3
SPI mode
L9966 SPI is implemented as per the following: CPHA = 1 / CPOL = 0
Communication starts with a falling edge on CS; during this phase the SCLK line must be low.
With the following rising edges of SCLK line the MISO data is shifted out from the internal shift register while the
MOSI data is latched in on the following falling edges.
13.4
Frame definition
The FlexInput chip implements a 32 bits in-frame SPI protocol, see the following tables.
Table 34. Complete 32 bits frame
Instruction
Data
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1
Register Address
X
X
X
write data or ignored if R/W=0
Z
Z
1
0
1
0
1
Register Address (blind echo)
read data or previous content of register in case of write
0xFFFF in case of wrong instruction code
Table 35. 16 bits instruction word
Instruction
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
MOSI
1
Register Address
X
X
X
MISO
Z
Z
1
0
1
0
1
Register Address (blind echo)
L9966
SPI mode
DS12459 - Rev 10
page 53/122



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