Specifications

Wireless-Tag Technology Co., Ltd. V1.0.0
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4.3
Window Watchdog(WWDG)
Window Watchdog(WWDG)will generate a WWDG reset if it is refreshed too early or too late. It can be
used to detect whether the software fails to refresh the watchdog or it refreshes the watchdog in the refresh
prohibited area to prevent the program from running into an uncontrollable state.
The features are as follows:

Supports setting a watchdog refresh prohibited area
 Set a watchdog refresh prohibited period through WIN

When WIN register is set to 11, refreshing the watchdog in any area will not
generate a reset.

Refreshing the watchdog in the refresh prohibited area will generate a WWDG reset.
 WWDG interrupt occurs after the watchdog refresh prohibited area

WWDG interrupt can be used as a watchdog refresh request
 WWDG overflow length can be set

Can be set by WWDG_RLR register
 WWDG reset generated on overflow

WWDG interrupt can be used as a watchdog refresh request
4.4
General Purpose and Alternate Function(GPIO and AFIO)
Each GPIO port contains 16 independent pins, which can be individually configured as input or output.
Each pin can be additionally configured as an open-drain output mode or a filtered input mode, and the
drive strength of each pin can be selected when configured as output pin.
GPIO pins can be multiplexed as peripheral function ports, such as PWM output port or UART
communication port, and each peripheral can be multiplexed onto multiple pins. The GPIO port supports
up to 13 asynchronous external interrupts, which can be configured to any IO pin. And the GPIO port
supports triggering other peripherals through PIS.
The features are as follows:
 Can be configured as input or output
 Configurable output mode
 Push-pull/open drain
 Pull-up/pull-down
 Input mode
 Floating
 Pull-up/pull-down