L99MH98 datasheet(56/147 Pages) STMICROELECTRONICS

56 / 147 page

•

Frame n+1

–

SDI:

◦

Bit 23 = 0 or 1 (read or write command on the OpCode)

◦

Bit 22 = Not used

◦

Bits 21 to 16 = Address of the register to read or write

◦

Bits 15 to 1 = Data to write (if write command was chosen) or all ‘0’ (if read command was

chosen)

◦

Bit 0 = Parity bit

–

SDO:

◦

Bit 23 = 0 (no SPI error or RESET in the previous access)

◦

Bit 22 = GSBN bit (0 = Fault)

◦

Bits 21 to 16 = Address of the register selected in the previous frame (n)

◦

Bits 15 to 1 = Data value of the register selected in the previous frame (n)

◦

Bit 0 = Parity bit

Figure 39. Access while an internal fault happens scenario

Frame n

Read or

Write cmd

Address of the register

to read reg1

Status register bit15, bit14 and bit1 are set to ‘0’  no fault, no reset

Data field

Internal device

fault happens

Frame n+1

SPI Error or RESET

0 means:

No SPI error in previous access (frame n-1)

No reset before this access

GSBN: 0 means fault is present

at CS falling edge of frame n+1

Address reg1, selected by SDI

during previous frame (n)

Data value of reg1 (selected by SDI during previous

frame (n)) saved at frame n+1 cs falling

new command

Address reg2

Data to write into reg2

L99MH98

Serial peripheral interface (SPI)

DS14611 - Rev 3

page 56/147

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