TCNTOUT() returns the accumulated upper overflow value in 32-bit extension mode.

uint16_t TCNTOUT(uint8_t timerNumber)

const uint8_t COUNTER_TIMER = 1;
 
void setup() {
  Serial.begin(115200);
  TCNTSETUP(COUNTER_TIMER, true);  // Configure the timer's external clock input and 32-bit extension mode.
}
 
void loop() {
  static uint16_t previousOverflow = 0;
  const uint16_t overflowCount = TCNTOUT(COUNTER_TIMER);  // Return the accumulated upper overflow value in 32-bit extension mode.
  if (overflowCount != previousOverflow) {
    previousOverflow = overflowCount;
    Serial.println(overflowCount);
  }
}

• Timer external clock mode is supported only by MPINO-8A8R and MPINO-16A8R8T.
• Even on supported products, verify TCNT terminals and timer numbers using product documentation.
• Do not interpret TCNTOUT() as a simple function for reading the current 16-bit counter.
• In interrupt ISRs on other products, perform no work other than incrementing the count.

• TCNTSETUP() View detailed description

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