AS3911 datasheet(79/149 Pages) AMSCO

79 / 149 page

ams Datasheet, Confidential: 2013-Oct [2-03]

AS3911 – 79

Appl icatio n I n f o rm a t i o n

Mask Receive Timer Register

Figure 61:

Mask Receive Timer Register

Note(s) and/or Footnote(s):

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

2. In NFCIP-1 bit rate detection mode, the clock of the Mask Receive timer is additionally divided by eight (one count is 512/fc) to

cover range up to ~9.6 ms.

No-response Timer Register 1

Figure 62:

No-response Timer Register 1

Note:

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

Address 0Eh: Mask Receive Timer Register

Type: RW

Bit

Name

Default

Function

Comments

7mrt7

Defined in steps of 64/fc (4.72 μs).

Range from 256/fc (~18.88 μs) to

16320/fc (~1.2 ms)

Timeout = mrt<7:0> * 64/fc

Timeout (0 ≤ mrt<7:0> ≤ 4) = 4 *

64/fc (18.88 μs)

In NFCIP-1 bit rate detection mode

one step is 512/fc (37.78 μs)

Defines time after end of Tx during

which receiver output is masked

(ignored).

For the case of ISO14443A 106 kbit/s

the Mask Receive Timer is defined

according to PCD to PICC frame delay

time definition, where mrt<7:0>

define number of n/2 steps.

Minimum mask receive time of 18.88

μs covers the transients in receiver

after end of transmission.

6mrt6

5mrt5

4mrt4

3mrt3

2mrt2

1mrt1

0mrt0

Address 0Fh: No-response Timer Register 1

Type: RW

Bit

Name

Default

Function

Comments

7nrt15

No-response Timer definition MSB

bits

Defined in steps of 64/fc (4.72 μs).

Range from 0 to 309 ms

In case bit nrt_step in General

Purpose and No-response Timer

Control Register is set the step is

changed to 4096/fc

Defines timeout after end of Tx.

In case this timeout expires

without detecting a response a

No-response interrupt is sent.

In NFC mode the NO response

timer is started only when

external field is detected

All 0: No-response timer is not

started.

No-response timer is reset and

restarted with Start

No-response Timer direct

command.

6nrt14

5nrt13

4nrt12

3nrt11

2nrt10

1nrt9

0nrt8

AS3911 Datasheet(PDF) 79 Page - ams AG

AS3911 Datasheet(HTML) 79 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL