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annotate defs/m6809.d @ 1699:0ec4d6e34fcc

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Added xmode (forgot for 6309) in makefile
author boisy
date Tue, 03 Aug 2004 19:53:36 +0000
parents 7af4d12008f4
children 27e85b681dab
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1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2 ; m6809
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3 ;
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4 ; $Id$
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5 ;
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6 ; Edt/Rev YYYY/MM/DD Modified by
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7 ; Comment
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8 ; ------------------------------------------------------------------
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9 ; 2004/05/17 Boisy G. Pitre
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10 ; Started.
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12 .title Motorola 6809 Definitions
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14 ; Motorola 6809 Register Definitions
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15 R$CC == 0 ; Condition Codes register
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16 R$A == 1 ; A Accumulator
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17 R$B == 2 ; B Accumulator
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18 R$D == R$A ; Combined A:B Accumulator
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19 R$DP == 3 ; Direct Page register
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20 R$X == 4 ; X Index register
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21 R$Y == 6 ; Y Index register
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22 R$U == 8 ; User Stack register
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23 R$PC == 10 ; Program Counter register
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24 R$Size == 12 ; Total register package size
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27 ; Condition Code Definitions
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28 Entire == 0b10000000 ; Full Register Stack flag
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29 FIRQMask == 0b01000000 ; Fast-Interrupt Mask bit
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30 HalfCrry == 0b00100000 ; Half Carry flag
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31 IRQMask == 0b00010000 ; Interrupt Mask bit
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32 Negative == 0b00001000 ; Negative flag
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33 Zero == 0b00000100 ; Zero flag
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34 TwosOvfl == 0b00000010 ; Two's Comp Overflow flag
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35 Carry == 0b00000001 ; Carry bit
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36 IntMasks == IRQMask+FIRQMask
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37 Sign == 0b10000000 ; sign bit