PM0044 |
STM8 addressing modes |
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6.10Long Pointer Indirect Long Indexed addressing mode
The pointer address is a word, the pointer size is a word, thus allowing up to 128 KB addressing space, and requires 2 bytes after the op-code.
Example:
1089 1800 ptr dc.w table
1800 10203040 table dc.b $10,$20,$30,$40
1690 |
AE03 |
LD |
X,#3 |
1692 |
72D61089 |
LD |
A,([longptr.w],X) |
X = 3
A = ([longptr.w],X) = ((longptr.w), X) = (($1089.w), 3)
= ($1800,3) = ($1803) = $40
Doc ID 13590 Rev 3 |
51/162 |
STM8 addressing modes |
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PM0044 |
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Figure 19. Long Pointer Indirect Long Indexed addressing mode example |
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Before completion |
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ptr .word table |
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18 |
1089 |
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Steps to determine |
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00 |
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108A |
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PC |
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Effective Address |
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LD A,([longptr.w],X) |
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72 |
1692 |
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1692 |
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PC = 1692 |
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D6 |
1693 |
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PC = PC + 2 = 1694 |
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10 |
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X |
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1694 |
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EA= (((PC) : (PC+1)) : |
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89 |
1695 |
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03 |
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((PC) : (PC+1) +1)) + X |
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A |
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EA = 1803 |
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table .byte 0x10,0x20,0x30, |
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10 |
1800 |
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Previous value |
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0x40 |
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20 |
1801 |
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30 |
1802 |
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1800 |
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03 |
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Adder |
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40 |
1803 |
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EA |
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1803 |
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After completion |
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ptr .word table |
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18 |
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1089 |
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Instruction Complete |
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00 |
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108A |
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X |
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A = (EA) = 40 |
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LD A,([longptr.w],X) |
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New PC = PC + 2 = 1696 |
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92 |
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1692 |
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03 |
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D6 |
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1693 |
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10 |
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1694 |
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89 |
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1695 |
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New PC |
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1696 |
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1696 |
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table .byte 0x10,0x20,0x30, |
10 |
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1800 |
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0x40 |
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20 |
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1801 |
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30 |
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1802 |
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A |
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40 |
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1803 |
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40 |
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52/162 |
Doc ID 13590 Rev 3 |