9

4421B–ASSP–10/05

TSSIO16E

4.4.1.3

Bit B3

Bit B3 is used for activating or inhibiting line surveillance.

Active surveillance: default status.

Inhibited surveillance: no more possibility to switch safety mode. Then, INT pin delivers an inter-

ruption at the end of each identified frame adressing the system.

4.4.1.4

Bits B4, B5, B6 and B7

Bits B6, B5 and B4 form an address giving the user module number (see example below). Bit

B7 is a protection bit which enables or disables access to the peripheral.

Note: whatever the status mode, it is always possible to write into the command register.

B3

COMMAND

STATUS

0

active surveillance

circuit in NORMAL mode

1

inhibited surveillance

circuit in SAFETY mode

14/16 TS

1 TS

RXDi

INT

B

7

B

6

B

5

B

4

COMMAND

STATUS

0

module

The peripheral becomes free of access

The peripheral is free of access

1

The peripheral becomes busy with a

module

which address is B6 B5 B4

The peripheral is busy with a module

of address B6 B5 B4