ST25DV04K datasheet(37/197 Pages) STMICROELECTRONICS

37 / 197 page

Note:

Refer to Table 12. Dynamic registers memory map for the GPO_CTRL_Dyn register.

•

Allows I2C host to dynamically enable or disable GPO output by writing in GPO_EN bit (b7).

•

GPO_EN bit of GPO_CTRL_Dyn register is prevalent over GPO_EN bit of GPO register.

•

At power up, and each time GPO register is updated, GPO_CTRL_Dyn content is copied from GPO

•

GPO_CTRL_Dyn is a volatile register. Value is maintained only if at least one of the two power sources is

present (RF field or VCC).

•

GPO_CTRL_Dyn bit 7 (GPO_EN) can be written even if I2C security session is closed (I2C password not

presented) but is read only for RF user.

•

Modifying GPO_CTRL_Dyn, the bit 7 GPO_EN does not affect the value of GPO register bit 7 GPO_EN

Table 31. IT_STS_Dyn access

I2C

Command

Type

Address

Type

No access

E2 = 0, 2005h

Table 32. IT_STS_Dyn

Bit

Name

Function

Factory Value

RF_USER

0: Manage GPO reset GPO

1: Manage GPO set GPO

RF_ACTIVITY

0: No RF access

1: RF access

RF_INTERRUPT

0: No Manage GPO interrupt request

1: Manage GPO interrupt request

FIELD_FALLING

0: No RF field falling

1: RF Field falling

FIELD_RISING

0: No RF field rising

1: RF field rising

RF_PUT_MSG

0: No message put by RF in FTM mailbox

1: Message put by RF in FTM mailbox

RF_GET_MSG

0: No message read by RF from FTM mailbox

1: Message read by RF from FTM mailbox, and end of

message has been reached.

RF_WRITE

0: No write in EEPROM

1: Write in EEPROM

Note:

Refer to Table 12. Dynamic registers memory map for the IT_STS_Dyn register.

•

Cumulates all events which generate interruptions. It should be checked by I2C host to know which event

triggered an interrupt on GPO pin.

•

When enabled, RF events are reported in IT_STS_Dyn register even if GPO output is disabled though the

GPO_EN bit.

•

Once read the ITSTS_Dyn register is cleared (set to 00h).

•

At power up, IT_STS_Dyn content is cleared (set to 00h).

•

IT_STS_Dyn is a volatile register. Value is maintained only if at least one of the two power sources is

present (RF field or VCC).

ST25DV04K ST25DV16K ST25DV64K

GPO

DS10925 - Rev 11

page 37/197

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