BLUENRG-2 datasheet(136/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

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DocID030675 Rev 2

WDT_LOAD

Interrupt interval (ms)

32767

1000

4095

125

127

3.90625

1.953125

0.0610

A watchdog interrupt is generated each time the counter reaches zero. The counter is then

reloaded with the content of the WDT_LR register. The interrupt status should be cleared

by writing to the interrupt clear register. When the interrupt is cleared, the counter is

reloaded with the WDT_LOAD value. If the interrupt status is not cleared and a new

interrupt is generated, then a watchdog Reset is generated, rebooting the system.

The watchdog interrupt and Reset generation can be enabled or disabled as required by

the system using the relevant bits in the control register. When the interrupt generation is

disabled the watchdog counter is also stopped, and when the interrupt is enabled the

counter will start from the programmed value, not the last-count value.

Write access to the registers within the watchdog timer can be disabled in the watchdog

lock register. Writing a value of 0x1ACC_E551 to this WDT_LOCK register allows write

access to all other registers; writing any other value disables write access. This feature is

included to allow some protection against software that might otherwise disable the

watchdog functionality.

3.14.3

Watchdog registers

WDG peripheral base address (WDG_BASE_ADDR) 0x40700000.

Table 170: WDG registers

Address

offset

Name

Reset

Description

0x00

0xFFFFFFFF

Watchdog load register. Refer to the detailed

description below.

0x04

VAL

0xFFFFFFFF

Watchdog value register. Refer to the detailed

description below.

0x08

0x00000000

Watchdog control register. Refer to the detailed

description below.

0x0C

ICR

0x00000000

Watchdog interrupt clear register. Refer to the

detailed description below.

0x10

RIS

0x00000000

Watchdog raw interrupt status register. Refer to the

detailed description below.

0x14

MIS

0x00000000

Watchdog masked interrupt status register. Refer to

the detailed description below.

0xC00

LOCK

0x00000000

Watchdog Lock register. Refer to the detailed

description below.

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