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MC6809: Fix flag updates during interrupt conditions

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-05-04 12:45:53 +01:00
parent fc9263fb3a
commit d2893e73ac
1 changed files with 9 additions and 8 deletions
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17
MC6809/MC6809.cs
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@ -4,6 +4,7 @@
// Uses some information from:
// http://www.cpu-world.com/Arch/6809.html
// http://atjs.mbnet.fi/mc6809/Information/6809.htm
// |---------------|-----------------------------------|
// | MPU State | |
@ -25,7 +26,7 @@
private const byte FIRQvector = 0xf6; // FIRQ vector
private const byte SWI2vector = 0xf4; // SWI2 vector
private const byte SWI3vector = 0xf2; // SWI3 vector
private const byte RESERVEDvector = 0xf0; // RESERVED vector
// private const byte RESERVEDvector = 0xf0; // RESERVED vector
private byte cc = 0;
private byte dp = 0;
@ -304,8 +305,8 @@
this.LowerBA();
this.RaiseBS();
this.DP = 0;
SetFlag(this.CC, StatusBits.IF); // Disable IRQ
SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.CC = SetFlag(this.CC, StatusBits.IF); // Disable IRQ
this.CC = SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.Jump(this.GetWordPaged(0xff, RESETvector));
this.Tick(10);
}
@ -316,7 +317,7 @@
this.LowerBA();
this.RaiseBS();
this.SaveEntireRegisterState();
SetFlag(this.CC, StatusBits.IF); // Disable IRQ
this.CC = SetFlag(this.CC, StatusBits.IF); // Disable IRQ
this.Jump(this.GetWordPaged(0xff, IRQvector));
this.Tick(12);
}
@ -337,8 +338,8 @@
this.LowerBA();
this.RaiseBS();
this.SaveEntireRegisterState();
SetFlag(this.CC, StatusBits.IF); // Disable IRQ
SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.CC = SetFlag(this.CC, StatusBits.IF); // Disable IRQ
this.CC = SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.Jump(this.GetWordPaged(0xff, NMIvector));
this.Tick(12);
}
@ -349,8 +350,8 @@
this.LowerBA();
this.RaiseBS();
this.SavePartialRegisterState();
SetFlag(this.CC, StatusBits.IF); // Disable IRQ
SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.CC = SetFlag(this.CC, StatusBits.IF); // Disable IRQ
this.CC = SetFlag(this.CC, StatusBits.FF); // Disable FIRQ
this.Jump(this.GetWordPaged(0xff, FIRQvector));
this.Tick(12);
}