ST25DV04K datasheet(23/197 Pages) STMICROELECTRONICS

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Table 19. MB_CTRL_Dyn

Bit

Name

Function

Factory Value

MB_EN (1)

0: Disable FTM, FTM mailbox is empty

1: Enable FTM

HOST_PUT_MSG

0: No I2C message in FTM mailbox

1: I2C has Put a message in FTM mailbox

RF_PUT_MSG

0: No RF message in FTM mailbox

1: RF has Put message in FTM mailbox

RFU

HOST_MISS_MSG

0: No message missed by I2C

1: I2C did not read RF message before watchdog time out

RF_MISS_MSG

0: No message missed by RF

1: RF did not read message before watchdog time out

HOST_CURRENT_MSG

0: No message or message not coming from I2C

1: Current Message in FTM mailbox comes from I2C

RF_CURRENT_MSG

0: No message or message not coming from RF

1: Current Message in FTM mailbox comes from RF

1. MB_EN bit is automatically reset to 0 if MB_MODE register is reset to 0.

Note:

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

Table 20. MB_LEN_Dyn access

I2C

Command

Type

Address

Type

Read Message Length (cmd code ABh)

Fast Read Message Length (cmd code CBh)

E2 = 0, 2007h

Table 21. MB_LEN_Dyn

Bit

Name

Function

Factory Value

b7-b0

MB_LEN

Size in byte, minus 1 byte, of message contained in FTM

mailbox (automatically set by ST25DVxxx)

Note:

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

5.1.2

Fast transfer mode usage

ST25DV acts as mailbox between RF (reader, smartphone, ...) and an I2C host (microcontroller...). Each interface

can send a message containing up to 256 bytes of data to the other interface through that mailbox.

To send data from RF reader to I2C host, fast transfer mode must be enabled, the mailbox must be free, VCC

power must be present, and the RF user must first writes the message containing data in the mailbox.

I2C host is then informed (by interruption on GPO output or polling on MB_CTRL_Dyn register) that a message

from RF is present in the mailbox.

Once the complete message has been read by I2C, mailbox is considered free again and is available for receiving

a new message (data is not cleared).

The RF user is informed that the message has been read by the I2C host by polling on MB_CTRL_Dyn register.

ST25DV04K ST25DV16K ST25DV64K

Fast transfer mode (FTM)

DS10925 - Rev 11

page 23/197

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