M24LR64E-R datasheet(30/140 Pages) STMICROELECTRONICS

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System memory area

M24LR64E-R

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Doc ID 022712 Rev 3

4.3.3

FIELD_ON indicator bit

The FIELD_ON indicator bit located as bit 1 of the Control register is a read-only bit used to

indicate when the RF power level delivered to the M24LR64E-R is sufficient to execute RF

commands.

●

When FIELD_ON = 0, the M24LR64E-R is not able to execute any RF commands.

●

When FIELD_ON =1, the M24LR64E-R is able to execute any RF commands.

Note:

During read access to the Control register in RF mode, the FIELD_ON bit is always read

at 1.

4.3.4

Configuration byte access in I²C and RF modes

In I²C mode, read and write accesses to the non-volatile Configuration byte are always

allowed. To access the Configuration byte, the device select code used for any I²C

command must have the E2 Chip enable address at 1.

The dedicated commands to access the Configuration byte in RF mode are:

●

Read configuration byte command (ReadCfg):

–

The ReadCfg command is used to read the eight bits of the Configuration byte.

●

Write energy harvesting configuration command (WriteEHCfg):

–

The WriteEHCfg command is used to write the EH_mode, EH_cfg1 and EH_cfg0

bits into the Configuration byte.

●

Write RF WIP/BUSY pin configuration command (WriteDOCfg):

–

The WriteDOCfg command is used to write the RF WIP/BUSY bit into the

Configuration byte.

After any write access to the Configuration byte, the new configuration is automatically

applied.

4.3.5

Control register access in I²C or RF mode

In I²C mode, read and write accesses to the volatile Control register are always allowed. To

access the Control register, the device select code used for any I²C command must have the

E2 Chip enable address at 1.

The dedicated commands to access the Control register in RF mode are:

●

Check energy harvesting enable bit command (CheckEHEn):

–

The CheckEHEn command is used to read the eight bits of the Control register.

When it is run, the FIELD_ON bit is always read at 1.

●

Set/reset energy harvesting enable bit command (SetRstEHEn):

–

The SetRstEHEn command is used to set or reset the value of the EH_enable bit

into the Control register.

4.4

ISO 15693 system parameters

The M24LR64E-R provides the system area required by the ISO 15693 RF protocol, as

shown in Table 17.

The first 32-bit block starting from I2C address 2304 stores the I2C password. This password

is used to activate/deactivate the write protection of the protected sector in I2C mode. At

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