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PM0044 датащи(PDF) 60 Page - STMicroelectronics |
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PM0044 датащи(HTML) 60 Page - STMicroelectronics |
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60 / 162 page ![]() STM8 addressing modes PM0044 60/162 Doc ID 13590 Rev 3 Figure 23. Bit Long Direct Relative addressing mode example After completion b0 = 0 04AC 72 01 Adder 72 01 PC EA (Branch taken) (EA) Adder 04A7 New PC 04AC Instruction Complete New PC = EA = 04A7 Steps to Determine Effective Address PC = 04A7 PC = PC + 2 = 04A9 TEMP = (PC) = FC PC = PC +1 = 04AC Stop here if there is no Branch; i.e., Test = TRUE (1) EA = PC + TEMP = 04AA + FD = 04A7 New PC = EA if Branch is taken wait_1 EA 05 PC 04A8 04A9 04A8 04A9 04A7 04A7 04A7 FB 04A7 b0 = 1 01 10 04A9 04AA (EA) 04AC New PC Instruction Complete New PC = EA = 04AC 04A8 04A7 04AC After completion (No branch taken) DRA .byte 104C 104B DRA b0 BTJF DRA, #0, wait_1 DRA.b0 =? 0 10 EA = (PC):(PC+1) = 104B PC = PC + 2 = 04AB Test = (EA).b0 10 4B 04AB wait_1 BTJF DRA, #0, wait_1 wait_1 BTJF DRA, #0, wait_1 04AA 4B 04AA 4B 04AC FB 04AB FB 04AB FB 72 04A7 |
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