ST95HF datasheet(46/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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DocID025630 Rev 4

How to modify Analog Register Configuration register (ACC_A) values

Use the PROTOCOLSELECT command (0x02) to select the correct communication

protocol.

For example, to select the ISO/IEC 14443-A card emulation protocol:

Send PROTOCOLSELECT command:

>>>0x02021208

ST95HF reply:

<<<0x0000

Read the Analog Register Configuration register (ACC_A) value.

Write the ACC_A register index at 0x04:

>>>0x0903680004

ST95HF reply:

<<<0x0000

Read the ACC_A register value:

>>>0x0803690100

ST95HF reply:

<<<0x0127

In this example, the ACC_A register value is 0x27, where “2” is the Demodulator

Sensitivity and “7” is the Load Modulation Index.

Modify the Load Modulation Index values with 0x25.

Write the ACC_A register index:

>>>0x090468010425

ST95HF reply:

<<<0x0000

Read the Analog Configuration register (ACC_A) value.

Write the ACC_A register index at 0x04:

>>>0x0903680004

ST95HF reply:

<<<0x0000

Read the ACC_A register value:

>>>0x0803690100

ST95HF reply:

<<<0x0125

Load Modulation Index and Demodulator Sensitivity values

Note:

Bits [7:6] of ACC_A register are RFU and must set to ‘0’.

Table 33. Possible Load Modulation Index values

Code (bits [3:0] of ACC_A register)

...

Load Modulation Index

Min.

Default

Max.

Table 34. Possible Demodulator Sensitivity values

Code (bits [5:4] of ACC_A register)

0x1

0x2

Demodulator Sensitivity (1)

1. Characterized by design simulation.

10%

100%

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