L9965P datasheet(81/104 Pages) STMICROELECTRONICS

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Table 84. NVM_OP_CMD - 0x031

Field name

Type

Bit

offset

Bit

width

Reset

value

Reset sources

Description

UNUSED

0x0

nPOR_MAIN

NVM_ERASE_VERIFY_ERROR

0x0

nPOR_MAIN

1 = Error during NVM erasing

NVM_PROGRAM_VERIFY_ERROR

0x0

nPOR_MAIN

1 = Error during NVM

programming

NVM_BUSY

0x0

nPOR_MAIN

1 = NVM busy

NVM_OPERATION

0x0

nPOR_MAIN

0x3 = Upload client NVM

sect and download all NVM

0x5 = Download all NVM

Table 85. HS_CMD - 0x32

Field name

Type Bit offset

Bit width

Reset value

Reset sources

Description

ARM_HS_SPI

0x0

nPOR_MAIN

0x155 = High Side SPI arming command

Table 86. LS_CMD - 0x33

Field name

Type Bit offset

Bit width

Reset value

Reset sources

Description

ARM_LS_SPI

0x0

nPOR_MAIN

0x2AA = Low Side SPI arming command

3.15

Configuration Lock

To prevent inadvertent modification of safety relevant registers (SRR) and safety latent registers (SLR), written in

bold in this document, such register map sectors are protected by a lock field.

By default, SRR/SLR registers are locked.

To configure the device, the following procedure shall be implemented:

1. MCU writes 0x55 in the SPECIAL_KEY register to enter in partial unlock.

2. MCU writes 0x33 in the SPECIAL_KEY register to confirm the full unlock.

3. MCU changes any configuration register within tCFG_TIMEOUT.

4. MCU reapplies the lock writing 0xAA in the SPECIAL_KEY.

If the tCFG_TIMEOUT expires, the lock is automatically reapplied.

Trying to write a protected register (SRR or SLR) without unlocking will result in the data being discarded.

Note:

•

Writing lock-protected registers only alters the current configuration loaded in the SPI registers. To save

the configuration and guarantee a correct reload at each power-up, the update has to be pushed into the

non-volatile memory (NVM), as described in the dedicated section.

•

For temporary modifications to the IC configuration, which do not need to be pushed in the non-volatile

memory, it is recommended to disable the configuration integrity check (CONF_CRC).

3.15.1

Configuration lock electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies

according to the Table 3; TJ according to the Table 2.

Table 87. Configuration Lock electrical parameters

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

tCFG_TIMEOUT

Configuration lock timeout

Tested in SCAN

1.8

2.1

L9965P

Functional description

DS14702 - Rev 4

page 81/104

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