STM8 addressing modes |
PM0044 |
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6.3.3Extended Direct addressing mode (only for CALLF and JPF)
The address is an extended word, thus allowing 000000 to FFFFFF addressing space, but requires 3 bytes after the op-code.
Example: |
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000409 |
8D0106E5 |
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CALLF sw_routine |
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0106E5 |
4C |
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sw_routine |
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INC |
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A |
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Action: |
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PC = $0106E5 |
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Figure 10. Far Direct addressing mode example |
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Before Completion |
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A |
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Steps to Determine |
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Previous Value |
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Effective Address |
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PC |
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CALLF |
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8D |
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0409 |
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0409 |
PC = 0409 |
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sw_routine |
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01 |
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040A |
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0106E5 |
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PC=PC+1 |
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EA=(PC):(PC+1):(PC+2) |
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040B |
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=0106E5 |
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New PC = EA |
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E5 |
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040C |
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EA |
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0106E5 |
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INC A |
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4C |
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0106E5 |
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After Completion |
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CALLF |
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Instruction Complete |
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8D |
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0409 |
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sw_routine |
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New PC = 0106E5 |
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040A |
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040B |
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E5 |
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040C |
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INC A |
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New PC |
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4C |
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0106E5 |
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0106E5 |
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VR02059U
38/162 |
Doc ID 13590 Rev 3 |