ST25DV04K datasheet(39/220 Pages) STMICROELECTRONICS

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DocID027603 Rev 4

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ST25DV04K ST25DV16K ST25DV64K

ST25DVxxx specific features

219

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, and the RF user must first writes the message containing data in the 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. Refer to Table 9: Dynamic registers memory map for the MB_CTRL_Dyn register.

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

Table 13. MB_CTRL_Dyn(1) (continued)

Command

Read Dynamic Configuration (cmd code ADh) @0Dh

Fast Read Dynamic Configuration (cmd code CDh) @0Dh

Write Dynamic Configuration (cmd code AEh) @0Dh

Fast Write Dynamic Configuration (cmd code CEh) @0Dh

Type

b0: R always, W – b7-b1: RO

I2C

Address

E2 = 0, 2006h

Type

b0: R always, W - b7 - b1: RO

Bit

Name

Function

Factory Value

Table 14. MB_LEN_Dyn(1)

Command

Read Message Lenght (cmd code ABh)

Fast Read Message Lenght (cmd code CBh)

Type

I2C

Address

E2 = 0, 2007h

Type

Bit

Name

Function

Factory Value

b7-b0

MB_LEN

Size in byte of message contained in FTM mailbox

(automatically set by ST25DVxxx)

1. Refer to Table 9: Dynamic registers memory map for the MB_LEN_Dyn register.

ST25DV04K Datasheet(PDF) 39 Page - STMicroelectronics

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