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I'm using the following code on a ATtiny45 to assign an interrupt to a button press (pin #7, PB2, INT0). However the LED doesn't blink when the button is pressed, as if the interrupt is not working. Why?

(Here is finally a solution).

I'm using the following code on a ATtiny45 to assign an interrupt to a button press (pin #7, PB2, INT0). However the LED doesn't blink when the button is pressed, as if the interrupt is not working. Why?

Here is a working code of deep sleep, with an interrupt when the pin #5 (PB0) changes:

Remark: for an unknown reason, if I add this code:

Edit: Here is a working code of deep sleep, with an interrupt when the pin #5 (PB0) changes...

...but for an unknown reason, if I add this code:

Here is a working code of deep sleep, with an interrupt when the pin #5 (PB0) changes:

#include <avr/interrupt.h>
#include <avr/sleep.h>
ISR(PCINT0_vect) {
 if (digitalRead(0) == LOW)
 digitalWrite(4, HIGH);
 else
 digitalWrite(4, LOW);
}
void setup() { 
 pinMode(4,OUTPUT); // LED
 pinMode(0,INPUT_PULLUP);
 pinMode(1,INPUT_PULLUP);
 pinMode(2,INPUT_PULLUP);
 ADCSRA = 0; // ADC disabled
 GIMSK = 0b00100000; // General Interrupt Mask Register, / Bit 5 – PCIE: Pin Change Interrupt Enable / When the PCIE bit is set (one) and the I-bit in the Status Register (SREG) is set (one), pin change interrupt is enabled. Any change on any enabled PCINT[5:0] pin will cause an interrupt. The corresponding interrupt of Pin Change Interrupt Request is executed from the PCI Interrupt Vector. PCINT[5:0] pins are enabled individually by the PCMSK0 Register. / see https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf
 PCMSK = 0b00000111; // Pin-change interrupt for PB0, PB1, PB2
} 
void loop() {
 sleep_enable();
 set_sleep_mode(SLEEP_MODE_PWR_DOWN); 
 sleep_cpu(); 
}

Remark: for an unknown reason, if I add this code:

ISR(PCINT1_vect) {
 if (digitalRead(1) == LOW)
 digitalWrite(4, HIGH);
 else
 digitalWrite(4, LOW);
}

the pin-change interrupt for PB0 still works (PCINT0), but not the interrupt for PB1 (PCINT1). Why?