STLC5464 datasheet(36/83 Pages) STMICROELECTRONICS

36 / 83 page

III - FUNCTIONAL DESCRIPTION (continued)

INITIALIZATION

BLOC K

HDLC (Tx a nd Rx)

INTER RUP T QUE UE

MON (Rx)

INTER RUP TQUE UE

C/I (Rx)

INTER RUP T QUE UE

IBA

IBA + 254

IBA + 256

+ HDLC

Que ue Size

IBA + 256

+ HDLC

Que ue S ize

+ MON

Que ue S ize

Figure 26 : The Three Circular Interrupt Memories

III.9 - Watchdog

This function is used to control the activity of the

application. It is composed of a counter which

counts down from an initial value loaded in the

Timer register by the microprocessor.

If the microprocessor doesn’t reset this counter

before it is totally decremented, the external Pin

WDO is activated ; this signal can be used to reset

the microprocessor and all the application.

The initial time value of the counter is programma-

ble from 0 to 15s in increments of 0.25ms.

At the reset of the component, the counter is auto-

matically initialized by the value corresponding to

512ms which are indicated in the Timer register.

The microprocessor must put WDR (IDCR Regis-

ter) to”1” to reset this counter and to confirm that

the application started correctly.

In the reverse case, the WDO signal could be used

to reset the board a second time.

III.10 - Reset

There are two possibilities to reset the circuit :

- by software,

- by hardware.

Each programmable register receives its default

value. After that, the default value of each data

for Time slot Assigner memory.

STLC5464

36/83

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