ST25R3910 datasheet(49/65 Pages) STMICROELECTRONICS

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ST25R3910

1.3.17

Modulation Depth Definition Register

Address: 10h

Type: RW

1.3.18

Modulation Depth Display Register

Address: 11h

Type: R

Table 24. Modulation Depth Definition Register(1)

Bit

Name

Default

Function

Comments

7am_s

0: AM modulated level is defined by

bits mod5 to mod0. Level is adjusted

automatically by Calibrate

Modulation Depth command

1: AM modulated level is defined by

bits dram7 to dram0.

mod5

MSB

See Section 1.2.14: AM modulation depth:

definition and calibration on page 30 for details

about AM modulation lavel definition.

mod4

mod3

mod2

mod1

mod0

LSB

Not used

1. Default setting takes place at power-up and after Set Default command.

Table 25. Modulation Depth Display Register(1)

Bit

Name

Default

Function

Comments

md_7

MSB

Displays result of Calibrate Modulation Depth

command.

Antenna drivers are composed of 8 binary

weighted segments. Bit md_x set to 1 indicates

that this particular segment will be disabled

during AM modulated state.

md_6

md_5

md_4

md_3

md_2

md_1

md_0

LSB

1. At power-up and after Set Default command content of this register is set to 0.

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