Sensoray 526 Manual do Utilizador descarregar pdf (Página 20)

Timer Control Register

0x00

Bits Type Default Description

[15:8] WO 0x00 Timer preload data in 100 us ticks.

[7:2] UU XXXXXX Reserved

[1] WO 0 Timer mode:

0 – manual restart;

1 – auto restart.

[0] WO 0 Manual restart. Writing a 1 restarts the timer if [1] is 0. Bit [0]

of the Interrupt Status register is set to 1 when timer expires.

Watchdog Timer Control Register

0x02

Bits Type Default Description

[15:5] UU X Reserved.

[4] WO 0 Solid-state relay control signal polarity: 0 – normal (active

when timed out), 1 – inverted (active when not timed out).

(See Note 2).

[3] WO 0 Watchdog timer software enable: writing a 1 enables, writing a

0 disables the watchdog timer (see Note 3).

[2:0] WO 000 Timeout interval:

000 – 16 sec;

001 – 8 sec;

010 – 4 sec;

011 – 2 sec;

100 – 1 sec;

101 – 0.5 sec;

110 – 0.25 sec;

111 – 0.125 sec.

Notes:

1. Reading the Watchdog Timer Control register “tags” the watchdog (restarts the count). The

data returned by read access is undefined.

2. The meaning of bit [4] corresponds to the case when a shunt in position 2 of jumper J4 is

NOT installed. If the shunt is installed, the meaning of bit [4] is reversed: 0 corresponds to

normal, and 1 – to inverted polarity of the solid-state relay control signal.

3. The meaning of bit [3] corresponds to the case when a shunt in position 1 of jumper J4 is

NOT installed. If the shunt is installed, the meaning of bit [3] is reversed: 0 enables, and 1

disables the watchdog timer. Thus installing the shunt enables the watchdog timer by default

after the power up.

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