ST95HF datasheet(44/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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DocID025630 Rev 4

Load Modulation Index and Demodulator Sensitivity parameters for Card

Emulation mode

The default value of these parameters (Table 35) is set by the PROTOCOLSELECT command,

but they can be overwritten using the Write Register (WRREG) command (0x09). Table 33

and Table 34 list possible values for the Load Modulation Index and Demodulator Sensitivity

parameters respectively.

This new configuration is valid until a new PROTOCOLSELECT or Write Register (of register

ACC_A) command is executed. Register values are cleared at power off.

Table 29. WRREG command description (Modulation Index and Receiver Gain)

Direction

Data

Comments

Example

Host to

ST95HF

0x09

Command code

>>>0x090468010113

Update ARC_B value to 0x13

>>>0x0903680001

Set Analog Register Index to

0x01 (ARC_B) (1)

1. This command must be executed before reading the ARC_B register (0x0803690100).

0x03

0x04

Length of data

0x68

Analog Register Configuration address

index

0x00

0x01

Flag Increment address or not after Write

command

0x01

Index pointing to the Modulation Index and

Receiver Gain values in the ARC_B

0xXX

New value for Modulation Index and

Receiver Gain nibbles (see Section 5.11.1)

ST95HF to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

Table 30. WRREG command description (Load Modulation Index and Demodulator

Sensitivity)

Direction

Data

Comments

Example

Host to

ST95HF

0x09

Command code

>>>0x0903680004

Set Analog Register Index to

0x04 (ACC_A) (1)

>>>0x090468010425

Update ACC_A to 0x25

0x03

0x04

Length of data

0x68

Analog Register Configuration address

index

0x00

0x01

Flag Increment address or not after Write

command

0x04

Index pointing to the Demodulator

Sensitivity and Load Modulation values in

ACC_A register (0x04) (see

Section 5.11.1)

0xXX

New value for Demodulator Sensitivity and

Load Modulation (see Section 5.11.1)

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