ST25R3918 datasheet(98/142 Pages) STMICROELECTRONICS

98 / 142 page

Application information

ST25R3918

98/142

DS13490 Rev 1

4.5.42

Number of transmitted bytes register 1

Address: 22h

Type: RW

4.5.43

Number of transmitted bytes register 2

Address: 23h

Type: RW

Table 66. Number of transmitted bytes register 1

Bit

Name

Default

Function

Comments

7ntx12

Number of full bytes to be

transmitted, MSB bits

Maximum supported number of bytes is 8191.

6ntx11

5ntx10

4ntx9

3ntx8

2ntx7

1ntx6

0ntx5

Table 67. Number of transmitted bytes register 2(1) (2)

Bit

Name

Default

Function

Comments

7ntx4

Number of full bytes to be

transmitted, MSB bits

Maximum supported number of bytes is 8191.

6ntx3

5ntx2

4ntx1

3ntx0

nbtx2

Number of bits to transmit after

the last full byte.

Set to 000 to transmit only full

bytes.

Bit transmission starts from LSB. Applicable for

ISO14443A:

– bit oriented anticollision frame in case last byte

is a split byte

– Tx is done without parity bit generation

– passive target: 4-bit ACK, NACK

nbtx1

nbtx0

1. If anctl bit is set while card is in idle state and nbtx is not 000, then i_par will be triggered during REQA and WUPA direct

command is issued.

2. Transmission of short or incomplete messages only works for ISO-A/B using the command Transmit without CRC.

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