public void OnInterruptRequested()
{
if (StatusRegister.HasFlag(NESCpuFlags.DisableInterrupts))
{
return;
}
WriteToDataBus(
(ushort)(Constants.InterruptStackPointerBase + StackPointer--),
(byte)((ProgramCounter >> 8) & Constants.Masks.LowByte));
WriteToDataBus(
(ushort)(Constants.InterruptStackPointerBase + StackPointer--),
(byte)(ProgramCounter & Constants.Masks.LowByte));
SetStatusFlag(NESCpuFlags.Break, false);
SetStatusFlag(NESCpuFlags.Unused, true);
SetStatusFlag(NESCpuFlags.DisableInterrupts, true);
WriteToDataBus(
(ushort)(Constants.InterruptStackPointerBase + StackPointer--),
(byte)StatusRegister);
AbsoluteAddress = Constants.InterruptRequestPCAddress;
var pcLowBits = ReadFromDataBus(AbsoluteAddress);
var pcHighBits = ReadFromDataBus((ushort)(AbsoluteAddress + 1));
ProgramCounter = (ushort)((pcHighBits << 8) | pcLowBits);
ClockCyclesRemaining = 7;
}
public bool GetFlag(CpuFlag cpuFlag) => StatusRegister.HasFlag(cpuFlag);
