ST25DV64K datasheet(26/200 Pages) STMICROELECTRONICS

26 / 200 page

RF access to mailbox

The RF Control & Access to mailbox is possible using dedicated custom commands:

•

Read Dynamic Configuration and Fast Read Dynamic Configuration to check availability of mailbox.

•

Write Dynamic Configuration and Fast Write Dynamic configuration to enable or disable fast transfer mode.

•

Read Message Length and Fast Read Message Length to get the length of the contained message,

•

Read Message and Fast Read Message to download the content of the mailbox,

•

Write Message and Fast Write Message to put a new message in mailbox. (New length is automatically

updated after completion of a successful Write Message or Fast Write Message command).

HOST_PUT_MSG is cleared following a valid reading of the last message byte, and mailbox is considered free

(but message is not cleared and is still present in the mailbox).

A RF read can start at any address of inside the message, but return an error 0Fh if trying to read after the last

byte of the message.

A RF reading operation will never clear RF_PUT_MSG , the message will remain available for I2C.

At the end of a successful RF message write, the message length is automatically set in MB_LEN_Dyn register,

and RF_PUT_MSG bit is set in MB_CTRL_Dyn register. and write access to the mailbox is not possible until

mailbox has been freed again.

The presence of a DC supply is mandatory to get RF access to the mailbox. VCC_ON can be checked reading

the dynamic register EH_CTRL_Dyn.

To get more details about sequences to prepare and initiate a Fast Transfer, to detect progress of a fast transfer

or to control and execute a fast transfer, please refer to AN4910. How to exchange data between wired (I2C) and

wireless world (RF ISO15693) using fast transfer mode supported by ST25DVxxx).

ST25DV04K ST25DV16K ST25DV64K

Fast transfer mode (FTM)

DS10925 - Rev 9

page 26/200

ST25DV64K 数据表(PDF) 26 Page - STMicroelectronics