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PM0044 Datasheet(PDF) 56 Page - STMicroelectronics |
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PM0044 Datasheet(HTML) 56 Page - STMicroelectronics |
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56 / 162 page  STM8 addressing modes PM0044 56/162 Doc ID 13590 Rev 3 Figure 21. Relative Direct addressing mode example Z CC Before completion After completion Z = 1 04A9 27 17 Adder 27 17 PC EA (Branch taken) CC Adder 04C0 New PC 04A9 SKIP : Instruction Complete New PC = EA = 04C0 Steps to Determine Effective Address PC = 04A7 PC = PC + 1 = 04A8 TEMP = (PC) = 17 PC = PC +1 = 04A9 Stop here if there is no Branch; i.e., Z = 0 EA = PC + TEMP = 04A9 + 17 = 04C0 New PC = EA if Branch is taken JREQ SKIP JREQ SKIP EA 02 PC 04A8 04A9 04A8 04C0 04A9 04A7 04A7 04A7 17 04C0 Z = 0 27 17 04A8 04A9 CC 04A9 New PC Instruction Complete New PC = EA = 04A9 JREQ SKIP 04A7 04A7 04A9 After completion (No branch taken) |
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