Mercurial > hg > Members > kono > nitros9-code
view defs/m6809.d @ 1914:395e22e5c0bd
Added more defs for porting back to level 1 someday
| author | boisy |
|---|---|
| date | Sun, 20 Nov 2005 17:11:16 +0000 |
| parents | 27e85b681dab |
| children |
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; m6809 - Motorola 6809 Definitions ; ; $Id$ ; ; Edt/Rev YYYY/MM/DD Modified by ; Comment ; ------------------------------------------------------------------ ; 2004/05/17 Boisy G. Pitre ; Created. .title Motorola 6809 Definitions ; Motorola 6809 Register Definitions R$CC == 0 ; Condition Codes register R$A == 1 ; A Accumulator R$B == 2 ; B Accumulator R$D == R$A ; Combined A:B Accumulator R$DP == 3 ; Direct Page register R$X == 4 ; X Index register R$Y == 6 ; Y Index register R$U == 8 ; User Stack register R$PC == 10 ; Program Counter register R$Size == 12 ; Total register package size ; Condition Code Definitions Entire == 0b10000000 ; Full Register Stack flag FIRQMask == 0b01000000 ; Fast-Interrupt Mask bit HalfCrry == 0b00100000 ; Half Carry flag IRQMask == 0b00010000 ; Interrupt Mask bit Negative == 0b00001000 ; Negative flag Zero == 0b00000100 ; Zero flag TwosOvfl == 0b00000010 ; Two's Comp Overflow flag Carry == 0b00000001 ; Carry bit IntMasks == IRQMask+FIRQMask Sign == 0b10000000 ; sign bit