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L99DZ70XP Datasheet(PDF) 31 Page - STMicroelectronics

Part # L99DZ70XP
Description  Door actuator driver
Download  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99DZ70XP Datasheet(HTML) 31 Page - STMicroelectronics

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L99DZ70XP
Functional description of the SPI
Doc ID 15162 Rev 3
31/47
Ocx: Operation code
Ax: Address
Dx: Data Bit
4.2
Command byte
Each communication frame starts with a command byte. It consists of an operating code
which specifies the type of operation (<Read>, <Write>, <Read and Clear>, <Read Device
Information>) and a 6 bit address. If less than 6 address bits are required, the remaining bits
are unused but are reserved.
4.2.1
Operation code definition
The <Write Mode> and <Read Mode> operations allow access to the RAM of the device.
A <Read and Clear Mode> operation is used to read a status register and subsequently
clear its content.
The <Read Device Information> allows access to the ROM area which contains device
related information such as <ID-Header>, <Product Code>, <Silicon Version and Category>
and <SPI-frame-ID>.
Table 20.
SPI frame
Command Byte
Data Byte
Data Byte
Bit
23
22
21
29
19
18
17
16
15
1413121110
9
8
7
6
543
21
0
Name
OC1
OC0
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Table 21.
Operation code definition
OC1
OC0
Meaning
0
0
<Write Mode>
0
1
<Read Mode>
1
0
<Read and Clear Mode>
1
1
<Read Device Information>


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