ESP8684 datasheet(33/60 Pages) ESPRESSIF

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4 Functional Description

• Configurable reset level

For details, see ESP8684 Technical Reference Manual > Chapter Brownout Detector.

4.1.3.8

Timer Group

The Timer Group (TIMG) in the ESP8684 chip can be used to precisely time an interval, trigger an interrupt

after a particular interval (periodically and aperiodically), or act as a hardware clock. ESP8684 has two timer

groups, each consisting of one general-purpose timer and one Main System Watchdog Timer.

Feature List

• 16-bit prescaler

• 54-bit auto-reload-capable up-down counter

• Able to read real-time value of the time-base counter

• Halt, resume, and disable the time-base counter

• Programmable alarm generation

• Timer value reload (auto-reload at an alarm or a software-controlled instant reload)

• RTC slow clock frequency calculation

• Real-time alarm events

For details, see ESP8684 Technical Reference Manual > Chapter Timer Group (TIMG).

4.1.3.9

Watchdog Timers

The Watchdog Timers (WDT) in ESP8684 are used to detect and recover from malfunctions. The chip contains

two digital watchdog timers: one in the timer group (MWDT) and one in the RTC Module (RWDT).

Feature List

• Digital watchdog timers:

– Four stages, each with a separately programmable timeout value and timeout action

– Timeout actions: Interrupt, CPU reset, core reset, system reset (RWDT only)

– Flash boot protection under SPI Boot mode at stage 0

– Write protection that makes WDT register read only unless unlocked

– 32-bit timeout counter

• Analog watchdog timer:

– Timeout period slightly less than one second

– Timeout actions: Interrupt, system reset

For details, see ESP8684 Technical Reference Manual > Chapter Watchdog Timers.

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ESP8684 Series Datasheet v2.0

ESP8684 Datasheet(PDF) 33 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.