STLC5432 datasheet(13/46 Pages) STMICROELECTRONICS

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8.2 Serial Interface Mode

When an Alarm bit is put to 1 in ALR (Alarm Reg-

ister), this bit generates automatically the trans-

mission of two bytes message onto DOUT during

Time slot 0 with :

– The first bit of the first byte at 0; the second

bit is at 0 and after the address bits of Alarm

– The data of the ALR (Alarm Register) is the sec-

ondbyte.

NB : When TSOR or Sa6R

bit of the CAR1

(Complementary Alarm Register 1) is put to ”1”, it

generates a message in which there are address

and data of TSORR Register (if TSOR bit is not

masked), or address and data of Sa6RR register

(if Sa6R is not masked).

If the four occurences to transmit a message are si-

multaneous,the priority order is:

Priority 1 :

Transmission of Alarm

has been detected.

Priority 2 :

Transmission of Register

data after reading message

from remote entity.

Priority 3 :

Transmission of TSORR

data after loading of this

Priority 4 :

Transmission of Sa6RR

data after loading of this

8.3 Stand Alone Mode

Interrupts are not generated.

AL0, AL1 pins indicate the current state of three

alarms : LOF, AIS, A bit received and DOUT pin

indicates the current state of nine alarms during

time-slot zero (See Par. 6.3).

STLC5432

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