AS3658F-BCTP datasheet(136/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Deta il ed Descri ption - System Functi ons

10.6

Watchdog

The purpose of the watchdog is to detect a deadlock of the software. If the watchdog is active, it must receive a

continuous trigger signal within a programmable time window. If there is no signal anymore for a certain time period

from a defined pad or special serial interface bit, it starts either a complete reset cycle or changes the state of an output

pin, which can be used e.g. as an interrupt to the processor.

The watchdog is highly configurable by the following register bits:

The complete block can be switched on by wtdg_on = 1 and off by wtdg_on = 0.

The watchdog time window is defined by the register wtdg_min_timer and wtdg_max_timer.

The trigger signal can be configured by register wtdg_trigger and wtdg_gpio_input. (Pin CURR1-CURR4 (GPIO1-

GPIO4) or register bit)

If the watchdog expires, the system can start automatically a reset cycle if wtdg_reset_on = 1

Table 156. Watchdog Register definitions

Addr:60

Watchdog control

These bits control the watchdog functions

Bit

Bit Name

Default

Access

Description

Table 157. Watchdog minimum timer definitions

Addr:61

Watchdog_min timer

These bits set the watchdog minimum timer

Bit

Bit Name

Default

Access

Description

Table 158. Watchdog max timer definitions

Addr:62

Watchdog_max timer

These bits set the watchdog maximum timer

Bit

Bit Name

Default

Access

Description

Any of the general purpose input / outputs can be configured to output the watchdog signal. The Watchdog delivers

a signal “wtdg_alarm”, which is normal ‘0’ and goes to ‘1’ in the case of a timer-overflow. This signal can be used as

e.g. a reset or interrupt for a processor.

wtdg_on

R/W

Switches on the complete watchdog

watchdog off

watchdog enabled

wtdg_res_on

R/W

If the watchdog expires and wtdg_res_on = 1 a reset

cycle will be started

wtdg_trigger

R/W

Use the register bit wtdg_sw_signal as trigger

signal for the watchdog

Use one of the GPIO pins CURR1_GPIO1 …

CURR4_GPIO4 as trigger input for the

watchdog; the actual pin is selected by setting

GPIOXIOSF to 01b(watchdog mode) and

GPIOXMode=010b (GPIO digital input)

(X=1...4)

7:0

Wtdg_min_timer

00h

R/W

Defines the minimum watchdog trigger time

(LSB=7.5ms, range: 0 – 1.9s)

7:0

Wtdg_max_timer

FFh

R/W

Defines the maximum watchdog trigger time

(LSB=7.5ms, range: 7.5ms – 1.9s), do not set to (00)h

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