TLE9461ES datasheet(104/140 Pages) INFINEON

104 / 140 page

TLE9461ES

Lite CAN SBC Family

Serial Peripheral Interface

Datasheet

104

Rev.1.1

2019-09-27

13.5

SPI Control Registers

READ/WRITE Operation (see also Chapter 13.3):

• The ‘POR / Soft Reset Value’ defines the register content after POR or SBC Reset.

• The ‘Restart Value’ defines the register content after SBC Restart, where ‘x’ means the bit is unchanged.

• One 16-bit SPI command consist of two bytes:

- the 7-bit address and one additional bit for the register access mode and

- following the data byte

The numbering of following bit definitions refers to the data byte and correspond to the bits D0...D7 and to

the SPI bits 8...15.

• There are four different bit types:

– ‘r’ = READ: read only bits (or reserved bits)

– ‘rw’ = READ/WRITE: readable and writable bits

– ‘rwh’ = READ/WRITE/Hardware: readable/writable bits, which can also be modified by the SBC

hardware

– ‘rwl’ = READ/WRITE/LOCKED: readable/writable bits, which are locked and cannot be modified

anymore once the bit CFG_LOCK_0 in the HW_CTRL_1 or CFG_LOCK_1 in the HW_CTRL_2 register are

set. The locking mechanism will remain active for all conditions (incl. Soft Reset) unless the bit

CFG_LOCK_0 (for CP_EN or GPIO only) is cleared again;

for bits relating to CFG_LOCK_1 the locking mechanism will remain active until the device is powered

down (VS < VPOR,f) and can only be changed at the next device power-up.

After a soft reset command: If the respective lock bit is not set then the POR values are resumed; if the

respective lock bit is set then the respective configurations stay unchanged, i.e. the soft reset has no

effect on those configurations.

• Reserved bits are marked as “Reserved” and always read as “0”. The respective bits shall also be

programmed as “0”.

• Reading a register is done byte wise by setting the SPI bit 7 to “0” (= Read Only).

• Writing to a register is done byte wise by setting the SPI bit 7 to “1”.

• SPI control bits are in general not cleared or changed automatically. This must be done by the

microcontroller via SPI programming. Exceptions to this behavior are stated at the respective register

description and the respective bit type is marked with a ‘h’ meaning that the SBC is able to change the

The registers are addressed wordwise.

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