ST25DV04K datasheet(35/197 Pages) STMICROELECTRONICS

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5.2.3

GPO registers

Four registers are dedicated to this feature: two (static) in system configuration, and two dynamic.

Table 25. GPO access

I2C

Command

Type

Address

Type

Read Configuration (cmd code A0h) @00h

Write Configuration (cmd code A1h) @00h

R always, W if RF configuration security

session is open and configuration not

locked

E2 = 1, 0000h

R always, W if I2C security

session is open

Table 26. GPO

Bit

Name

Function

Factory value

RF_USER_EN

0: disabled

1: GPO output level is controlled by Manage GPO Command (set/reset)

RF_ACTIVITY_EN

0: disabled

1: GPO output level changes from RF command EOF to response EOF.

RF_INTERRUPT_EN

0: disabled

1: GPO output level is controlled by Manage GPO Command (pulse).

FIELD_CHANGE_EN

0: disabled

1: A pulse is emitted on GPO, when RF field appears or disappears.

RF_PUT_MSG_EN

0: disabled

1: A pulse is emitted on GPO at completion of valid RF Write Message

command.

RF_GET_MSG_EN

0: disabled

1: A pulse is emitted on GPO at completion of valid RF Read Message

command if end of message has been reached.

RF_WRITE_EN

0: disabled

1: A pulse is emitted on GPO at completion of valid RF write operation in

EEPROM.

GPO_EN

0: GPO output is disabled. GPO is High-Z (open drain) or 0 (CMOS)

1: GPO output is enabled. GPO outputs enabled interrupts.

Note:

Refer to Table 11. System configuration memory map for the GPO register.

•

Enables the interruption source, and enable GPO output.

•

Several interruption sources can be enabled simultaneously.

•

The updated value is valid for the next command (except for the RF_WRITE interrupt, which is valid right

after EOF of the Write Configuration command if enabled through RF).

•

The GPO_EN bit (b7) allows to disable GPO output (High-Z for open drain version, driven low for CMOS

version). Interruptions are still reported in IT_STS_Dyn register.

•

RF configuration security session (present RF password 0) or I2C security session (present I2C password)

must be open in order to write the GPO register.

ST25DV04K ST25DV16K ST25DV64K

GPO

DS10925 - Rev 11

page 35/197

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