Simulate Interrupts and Clock Inputs

µVision4 simulates the behavior of the I/O inputs. If an I/O pin is configured as counter input, then the count value increments when the pin toggles. The following example shows how to simulate input for Counter 3:

// in your C user program
T3CON = 0x004B;              // set T3 Counter Mode

You may toggle the counter input P3.6 with the VTREG PORT3, i.e. with a signal function:

signal void ToggleT3Input (void) {
  while (1) {
    PORT3 = PORT3 ^ 0x0040;             // toggle P3.6
    twatch (CLOCK / 100000);            // with 100kHz
  }
}

View of the Counter 3 status with the Peripheral dialog.

Also, interrupt inputs are simulated: if a port pin is used as interrupt input, then the interrupt request will be set when you toggle the associated I/O pin.