Datasheet

Functional description of the SPI L99H01
32/53 DocID15567 Rev 6
4.2.1 Command byte
Each communication frame starts with a command byte. It consists of an operating code
which specifies the type of operation (<Read>, <Write>, <Fault Reset>,
<Read Device Information>) and a 6-bit address.
Comments:
• OCx: Operating code
• Ax: Address
4.2.2 OpCode definition
The <Write Mode> and <Read Mode> operations allow access to the RAM of the device.
The <Clear Status> operation is used to read a status register and subsequently clear its
content.
<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 24. DI
Command byte DI - data byte
1514131211109876543210
OC1 OC0 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
Table 25. DO
Global Status byte DO - data byte
15 14 13 12 11109 8 76543210
GL_ER FE STK_RESET_Q TSD TW UV OV WDTO D7 D6 D5 D4 D3 D2 D1 D0
Table 26. Command byte
Command byte
MSB LSB
Op code Address
OC1 OC0 A5 A4 A3 A2 A1 A0
Table 27. Operating code definition
OC1 OC0 Meaning
0 0 <Write Mode>
0 1 <Read Mode>
1 0 <Clear Status>
1 1 <Read Device Information>