TinyAVR Series 1 e.g. ATtiny1614 wake up from interrupt

Other Hardware 3rd Party Boards
3

I believe "full asynchronous detection" is referring to when the main clock is not running, which could also be in standby mode:

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This is the test I used:

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

// button on PA6 (arduino D2)  can wake from sleep on falling edge
// button on PA4 (arduino D0)  must wake from sleep on level change 
const uint8_t ledPin = 7 ; // PB0 (arduino D7)



ISR(PORTA_PORT_vect)
{
  PORTA.INTFLAGS = PIN4_bm | PIN6_bm ;  // clear interrupt  **
}

ISR(RTC_CNT_vect)
{
  RTC.INTFLAGS = RTC_OVF_bm | RTC_CMP_bm ;
}

void setup() {
  Serial.begin( 115200 );

  pinMode( ledPin, OUTPUT ) ;
  digitalWrite( ledPin, HIGH ) ;
  delay(1000) ;
  digitalWrite( ledPin, LOW ) ;

  // set up PA6 (D2) for falling interrupts
  //PORTA.PIN6CTRL = (PORTA.PIN6CTRL & ~PORT_ISC_gm) | PORT_ISC_FALLING_gc | PORT_PULLUPEN_bm ;
  
  // OR
  
  // set up PA4 (D0) for LEVEL change interrupts
  PORTA.PIN4CTRL = (PORTA.PIN4CTRL & ~PORT_ISC_gm) | PORT_ISC_LEVEL_gc | PORT_PULLUPEN_bm ;

  // set up RTC
  while (RTC.STATUS > 0) {} // Wait for all register to be synchronized
  cli() ;
  // see http://ww1.microchip.com/downloads/en/AppNotes/TB3213-Getting-Started-with-RTC-90003213A.pdf
  RTC.CLKSEL = RTC_CLKSEL_INT1K_gc; // 32KHz divided by 32, i.e run at 1.024kHz
  RTC.CTRLA = RTC_PRESCALER_DIV1_gc // NO Prescaler
              | RTC_RTCEN_bm         // Enable RTC
              | RTC_RUNSTDBY_bm;     // Run in standby
  RTC.CNT = 0;
  RTC.PER = 4096UL ; // 4 seconds
  set_sleep_mode(SLEEP_MODE_STANDBY);
  RTC.INTCTRL =   RTC_OVF_bm ;   
  sei() ;

}


void loop() {
  digitalWrite( ledPin, HIGH ) ;
  delay( 500 ) ;
  digitalWrite( ledPin, LOW ) ;
  delay( 500 ) ;
  
  cli() ;
  RTC.CNT = 0;
  sei() ;

  sleep_enable();
  sleep_cpu();  
  // wake here
}
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