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H8/3002 Datasheet(PDF) 87 Page - Renesas Technology Corp |
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H8/3002 Datasheet(HTML) 87 Page - Renesas Technology Corp |
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87 / 700 page  4.6 Notes on Stack Usage When accessing word data or longword data, the H8/3002 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 4-6 shows an example of what happens when the SP value is odd. Figure 4-6 Operation when SP Value is Odd TRAPA instruction executed CCR Legend CCR: PC: R1L: SP: SP PC RIL PC SP SP MOV. B RIL, @-ER7 SP set to H'FFFEFF Data saved above SP CCR contents lost Condition code register Program counter General register R1L Stack pointer Note: The diagram illustrates modes 3 and 4. H'FFFEFA H'FFFEFB H'FFFEFC H'FFFEFD H'FFFEFF 72 |
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