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PM0044 数据表(PDF) 40 Page - STMicroelectronics |
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PM0044 数据表(HTML) 40 Page - STMicroelectronics |
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40 / 162 page  STM8 addressing modes PM0044 40/162 Doc ID 13590 Rev 3 6.4.1 No Offset Indexed addressing mode There is no offset, (no extra byte after the op-code), but only allows 00..FF addressing space. Example: Figure 11. No Offset Indexed addressing mode example 00B8 11223344 table dc.w $1122, $3344 05F2 AEB8 LD X,#table 05F4 F6 LD A,(X) Action: X = table A = (X) = (table) = ($B8) = $11 Previous Value B8 A X Steps to determine Effective Address PC = 05F4 EA = X + 0000 = 00B8 Before completion Instruction Complete A = (EA) = 11 New PC = PC +1 = 05F5 After completion 00B8 F6 05F4 EA PC 11 A 11 X B8 New PC 05F5 LD A,(X) Table .word 1122 00B8 05F4 05F4 05F5 00B8 VR02059C 44 33 22 F6 11 44 33 22 Table .word 1122 LD A,(X) 00B9 00BA 00BB |
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