L9963E datasheet(64/184 Pages) STMICROELECTRONICS

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NVM Read: this operation downloads the NVM content into RAM. This function populates NVM_RD_x and

NVM_CNTR registers with the NVM content. Also trimming and calibration data will be re-downloaded.

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NVM Write: this operation pushes the RAM content into NVM. This function writes the NVM internal

sub-sectors fetching the data from NVM_WR_x and NVM_CNTR registers. Such a procedure does not

involve trimming and calibration data sectors. Since write operation is only capable of writing ‘ones’ and

it cannot write ‘zeroes’, before executing a Write operation, the NVM must be erased first. A maximum of

NNVM_MAX_WRITE write cycles is allowed.

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NVM Erase: this operation erases the NVM content, resetting all sub-sectors corresponding to NVM_RD_x

and NVM_CNTR registers to ‘0x0’. Such a procedure does not involve trimming and calibration data sectors.

After an Erase operation, only the Write operation is allowed.

The NVM must be operated in the following way: first Erase, then Write, then Read.

4.10.1

NVM read

To read the updated NVM content, simply re-trigger the NVM download performing the following procedure:

Set trimming_retrigger = ‘1’

Wait for TNVM_OP

Set trimming_retrigger = ‘0’

NVM_RD_x and NVM_CNTR registers are now populated with the updated data downloaded from NVM. The

whole NVM content, including user data, is checked against CRC upon download. In case of errors in the user

sectors, the EEPROM_CRC_ERR_CAL_RAM flag will be set.

Note:

NVM_WR_BUSY flag is not set during read operation. Do not perform Read operation after Erase (refer to NVM

Erase).

4.10.2

NVM erase

To erase the NVM content corresponding to NVM_RD_x registers, follow this procedure:

Program NVM_OPER = 10 and NVM_PROGRAM = 1 to set Erase mode

Write first unlock key NVM_UNLOCK_START = 0x1572F

Write second unlock key NVM_UNLOCK_START = 0x1602F

Wait TNVM_OP (during wait time, the flag NVM_WR_BUSY = 1)

Check NVM_WR_BUSY = 0, indicating the operation has been successfully accomplished

Set NVM_PROGRAM = 0

After an erase, it is mandatory to perform NVM Write operation in order to bring the internal NVM registers to a

defined state.

Note:

Read operation after an Erase is strictly forbidden. It will result in populating the RAM with randomic values,

including the NVM_CNTR. In case NVM_CNTR results greater than NNVM_MAX_WRITE, the memory will be

locked and no further erase/write will be possible.

4.10.3

NVM write

To update the NVM content corresponding to NVM_RD_x registers with new data, follow this procedure:

Write the desired data into NVM_WR_x registers (all registers have to be populated; it is not possible to

write just a selected bunch of registers). Make sure the NVM_WR_x registers are populated with the desired

data by reading back the answers incoming from L9963E

Program NVM_OPER = 11 and NVM_PROGRAM = 1 to set Write mode

Write first unlock key NVM_UNLOCK_START = 0x1572F

Write second unlock key NVM_UNLOCK_START = 0x1602F

Wait TNVM_OP (during wait time, the flag NVM_WR_BUSY = 1)

Check NVM_WR_BUSY = 0, indicating the operation has been successfully accomplished

Set NVM_PROGRAM = 0

Note:

Remember to perform NVM Erase before executing a Write operation. The Write operation actually writes only

‘ones’ and is not capable of writing ‘zeroes’. To see the effects of Write, the NVM_RD_x and NVM_CNTR

registers have to be refreshed by re-downloading the NVM content via NVM Read procedure.

L9963E

Internal Non Volatile Memory (NVM)

DS13636 - Rev 12

page 64/184

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