HT32F1653 datasheet(12/46 Pages) HOLTEK

12 / 46 page

Rev. 1.00

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Watchdog Timer – WDT

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12-bit down counter with 3-bit prescaler

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Interrupt or reset event for the system

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Programmable watchdog timer window function

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The Watchdog Timer is a hardware timing circuit that can be used to detect system failures due to

software malfunctions. It includes a 12-bit count-down counter, a prescaler, a WDT counter value

and a WDT protection mechanism. The Watchdog Timer can be operated in an interrupt mode or

a reset mode. The Watchdog Timer will generate an interrupt or a reset when the counter counts

down and reaches a zero value. If the software does not reload the counter value before a Watchdog

Timer underflow occurs, an interrupt or a reset will be generated when the counter underflows. In

addition, an interrupt or reset is also generated if the software reloads the counter when the counter

value is greater than or equal to the WDT delta value. This means the counter must be reloaded

within a limited timing window using a specific method. The Watchdog Timer counter can be

stopped while the processor is in the debug mode. There is a register write protect function which

can be enabled to prevent it from changing the Watchdog Timer configuration unexpectedly.

Real Time Clock – RTC

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32-bit up-counter with a programmable prescaler

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Alarm function

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Interrupt and Wake-up event

The Real Time Clock, RTC for short, includes an APB interface, a 32-bit count-up counter, a

control register, a prescaler, a compare register and a status register. Most of the RTC circuits are

located in the Backup Domain except for the APB interface. The APB interface is located in the

VDD18 power domain. Therefore, it is necessary to be isolated from the ISO signal that comes from

the power control unit when the VDD18 power domain is powered off, that is when the device enters

the Power-Down mode. The RTC counter is used as a wakeup timer to generate a system resume

signal from the Power-Down mode.

HT32F1653 Datasheet(PDF) 12 Page - Holtek Semiconductor Inc