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PM0044 数据表(PDF) 55 Page - STMicroelectronics |
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PM0044 数据表(HTML) 55 Page - STMicroelectronics |
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55 / 162 page  PM0044 STM8 addressing modes Doc ID 13590 Rev 3 55/162 6.12 Relative Direct addressing mode This addressing mode is used to modify the PC register value, by adding an 8-bit signed offset to it. The offset added to the PC register value is relative to the start of the next instruction. The offset follows the op-code. Example: 04A7 2717 jreq skip 04A9 9D nop 04AA 9D nop 04C0 20FE skip jra* ; Infinite loop Action: if (Z == 1)then PC = PC + $17 = $04A9 + $17 = $04C0 elsePC = PC= $04A9 Table 35. Overview of Relative Direct addressing mode instructions Addressing mode Syntax EA formula Ptr Adr Ptr Size Dest adr Direct Relative off PC = PC + off op + 1 --- PC +127/-128 Table 36. Available Relative Direct instructions Instructions Functions JRxx Conditional Jump JRA Jump Relative Always CALLR Call Relative |
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