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H83065 Datasheet(PDF) 111 Page - Renesas Technology Corp |
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H83065 Datasheet(HTML) 111 Page - Renesas Technology Corp |
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111 / 963 page ![]() Section 4 Exception Handling Rev. 4.00 Jan 26, 2006 page 89 of 938 REJ09B0276-0400 4.6 Notes on Stack Usage When accessing word data or longword data, the H8/3067 Group regards the lowest address bit as 0. The stack should always be accessed by word access or longword access, and the value of the stack pointer (SP, ER7) should always be kept even. Use the following instructions to save registers: PUSH.W Rn (or MOV.W Rn, @–SP) PUSH.L ERn (or MOV.L ERn, @–SP) Use the following instructions to restore registers: POP.W Rn (or MOV.W @SP+, Rn) POP.L ERn (or MOV.L @SP+, ERn) Setting SP to an odd value may lead to a malfunction. Figure 4.7 shows an example of what happens when the SP value is odd. |
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