ESP32-P4 datasheet(49/93 Pages) ESPRESSIF

49 / 93 page

4 Functional Description

Feature List

• Two 52-bit counters and three 52-bit comparators

• Software accessing registers clocked by APB_CLK

• CNT_CLK used for counting, with an average frequency of 16 MHz in two counting cycles

• 40 MHz XTAL_CLK as the clock source of CNT_CLK

• 52-bit alarm values (t) and 26-bit alarm periods (δt)

• Two modes to generate alarms:

– Target mode: only a one-time alarm is generated based on the alarm value (t)

– Period mode: periodic alarms are generated based on the alarm period (δt)

• Three comparators generating three independent interrupts based on configured alarm value (t) or alarm

period (δt)

• Software configuring the reference count value. For example, the system timer is able to load back the

sleep time recorded by RTC timer via software after Light-sleep

• Able to stall or continue running when CPU stalls or enters the on-chip-debugging mode

• Alarm for Event Task Matrix (ETM) event

4.1.4.8

Timer Group (TIMG)

ESP32-P4 chip contains two timer groups. Each timer group consists of two general-purpose timers and one

Main System Watchdog Timer (MWDT). The general-purpose timer is based on a 16-bit prescaler and a 54-bit

auto-reload-capable up-down counter.

Feature List

• A 54-bit time-base counter programmable to incrementing or decrementing

• Three clock sources: PLL_F80M_CLK or XTAL_CLK or RC_FAST_CLK

• A 16-bit clock prescaler, from 2 to 65536

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

• Able to halt and resume the time-base counter

• Programmable alarm generation

• Timer value reload —Auto-reload at alarm or software-controlled instant reload

• Calculate clock frequency —Calculate the measured frequency of the clock based on the crystal clock

• Level interrupt generation

• Support several ETM tasks and events

4.1.4.9

Watchdog Timers (WDT)

ESP32-P4 contains three digital watchdog timers: one in each of the two timer groups (called Main System

Watchdog Timers, or MWDT) and one in the LP system (called the RTC Watchdog Timer, or RWDT).

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ESP32-P4 Series Datasheet v0.5

ESP32-P4 Datasheet(PDF) 49 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.