PM0044 |
STM8 addressing modes |
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6.3.2Long Direct addressing mode
The address is a word, thus allowing 0000 to FFFF addressing space, but requires 2 bytes after the op-code.
Example: |
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0409 |
C606E5 |
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LD |
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A,coeff |
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06E5 |
40 |
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coeff |
dc.b |
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$ 40 |
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Action: |
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A = (coeff) = ($06E5) = $40 |
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Figure 9. |
Long Direct addressing mode example |
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Before Completion |
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A |
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Previous Value |
Steps to Determine |
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Effective Address |
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PC |
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LD A,Coeff |
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C6 |
0409 |
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0409 |
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PC = 0409 |
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06E5 |
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06 |
040A |
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PC = PC + 1 = 040A |
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EA = (PC) : (PC+1) = 06E5 |
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E5 |
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040B |
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040C |
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Coeff .byte 040h |
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40 |
06E5 |
EA |
06E5 |
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After Completion |
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Instruction Complete |
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LD A,Coeff |
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C6 |
0409 |
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06 |
040A |
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A = (EA) = 40 |
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New PC = PC + 2 = 040C |
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E5 |
040B |
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New PC |
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040C |
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040C |
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Coeff .byte 040h |
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A |
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40 |
06E5 |
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40 |
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VR02059B |
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Doc ID 13590 Rev 3 |
37/162 |