ST95HF datasheet(48/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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DocID025630 Rev 4

5.11.3

Improving RF reception for ISO/IEC 18092 tags

To improve ST95HF reception when communicating with ISO/IEC 18092 tags, it is possible

to enable an AutoDetect filter to synchronize ISO/IEC 18092 tags with the ST95HF. This

can be done using the Write Register (WRREG) command to enable the AutoDetect filter.

By default, this filter is disabled after the execution of the PROTOCOLSELECT command, but it

can be enabled using the WRREG command (0x09).

5.12

Subcarrier frequency response (0x0B) description

The SubFreqRes command (0x0B) returns the most recent subcarrier frequency detected

for ISO/IEC 18092 communication.

Table 37. WRREG command description (Timer Window)

Direction

Data

Comments

Example

Host to

ST95HF

0x09

Command code

>>>0x09043A005804

Set recommended TimerW

value.

0x03

0x04

Length of data

0x3A

Timer Window (TimerW) value

0x00

0x01

Flag Increment address or not after Write

command

0xXX

Set TimerW value (recommended value is

0x56 or 0x58)

0x04

TimerW value confirmation

ST95HF to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

Table 38. WRREG command description (AutoDetect Filter)

Direction

Data

Comments

Example

Host to

ST95HF

0x09

Command code

>>>0x09040A0102A1

Enable the AutoDetect filter.

0x03

0x04

Length of data

0x0A

AutoDetect filter control value

0x00

0x01

Flag Increment address or not after Write

command

0x02

AutoDetect filter enable

0xA1

AutoDetect filter confirmation

ST95HF to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

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