Watchdog Test (Wdttest) Register, Offset 0X418; Watchdog Lock (Wdtlock) Register, Offset 0Xc00; Watchdog Test (Wdttest) Register; Watchdog Lock (Wdtlock) Register - Texas Instruments Concerto F28M35 Series Technical Reference Manual

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3.3.7 Watchdog Test (WDTTEST) Register, offset 0x418

The watchdog test (WDTTEST) register provides user-enabled stalling when the microcontroller asserts

the CPU halt flag during debug.

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 3-8. Watchdog Test (WDTTEST) Register Field Descriptions

Writing 0x1ACC.E551 to the watchdog lock (WDTLOCK) register enables write access to all other

registers. Writing any other value to the WDTLOCK register re-enables the locked state for register writes

to all the other registers. Reading the WDTLOCK register returns the lock status rather than the 32-bit

value written. Therefore, when write accesses are disabled, reading the WDTLOCK register returns

0x0000.0001 (when locked; otherwise, the returned value is 0x0000.0000 (unlocked)).

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 3-9. Watchdog Lock (WDTLOCK) Register Field Descriptions

SPRUH22I – April 2012 – Revised November 2019

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Figure 3-8. Watchdog Test (WDTTEST) Register

Watchdog stall enable

If the microcontroller is stopped with a debugger, the watchdog timer stops counting. Once the

microcontroller is restarted, the watchdog timer resumes counting.

The watchdog timer continues counting if the microcontroller is stopped with a debugger.

Figure 3-9. Watchdog Lock (WDTLOCK) Register

Watchdog lock

A write of the value 0x1ACC.E551 unlocks the watchdog registers for write access. A write of any

other value reapplies the lock, preventing any register updates.

A read of this register returns the following values:

A watchdog time-out event has been signalled to the interrupt controller.

M3 Watchdog Timers

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