public void SetFlagBit(Flag_Register_Bits bitNumber, bool state)
{
Byte reg_f = Program.emulator.getCPU().get_reg_f();
if (state)
{
reg_f |= (Byte)(1 << (Byte)bitNumber);
}
else
{
reg_f &= (Byte) ~(1 << (Byte)bitNumber);
}
Program.emulator.getCPU().set_reg_f(reg_f);
}
/*
* The interrupt process is as follows:
* 1 When an interrupt is processed, the corresponding IF flag is set.
* 2 Interrupt enabled.
* If the IME flag (Interrupt Master Enable) and the corresponding IE flag are set, the interrupt is performed by the following steps.
*
* 3 The IME flag is reset, and all interrupts are prohibited.
* 4 The contents of the PC (program counter) are pushed onto the stack RAM.
* 5 Control jumps to the interrupt starting address of the interrupt.
*
*/
public bool GetFlagBit(Flag_Register_Bits bitNumber)
{
return((Program.emulator.getCPU().get_reg_f() & (1 << (Byte)bitNumber)) != 0);
}
