AS3910 datasheet(26/47 Pages) AMSCO

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AS3910

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Note:

Default setting is set at power up and after Set Default command.

Note:

Default setting is set at power up and after Set Default command.

Table 14. Configuration Register 4

Address # 04: Configuration Register 4 (ISO-14443B)

type: RW

Bit

Name

Def.

Function

Comments

egt2

egt1

egt0

number of EGT

EGT time defined in number of etu

egt1

egt0

001

110

111

4sof_0

→ 10 etu, 1 → 11 etu

SOF, number of etu with logic 0 (10 or 11)

3sof_1

→ 2 etu, 1 → 3 etu

SOF, number of etu with logic 1 (2 or 3)

eof

→ 10 etu, 1 → 11 etu

EOF, number of etu with logic 0 (10 or 11)

egt

→ no EGT after last character,

→ EGT after each character

Not used

Table 15. Configuration Register 5

Address # 05: Configuration Register 5

type: RW

Bit

Name

Def.

Function

Comments

7pmd

→ PM demodulation

→ AM demodulation

AM/PM demodulation selection

6am

→ OOK, 1 → AM

Valid for Transparent mode. For ISO-14443 and

NFC modes, modulation type is set automatically

(ISO-14443A and NFC is OOK, ISO-14443B is AM)

(see Table 26)

Not used

fifo_lr

→ 28, 1 → 24

FIFO water level for receive

fifo_lt

→ 4, 1 → 8

FIFO water level for transmit

Not used

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