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HD6433713 Datasheet(PDF) 85 Page - Renesas Technology Corp |
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HD6433713 Datasheet(HTML) 85 Page - Renesas Technology Corp |
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85 / 324 page  3.2.10 Notes on Stack Area Use When word data is accessed in the H8/300L Series, the least significant bit of the address is regarded as 0. Access to the stack always takes place in word size, so the stack pointer (SP: R7) should never indicate an odd address. Use PUSH Rn (MOV.W Rn, @–SP) or POP Rn (MOV.W @SP+, Rn) to save or restore register values. Setting an odd address in SP may cause a program to crash. An example is shown in figure 3-7. Figure 3-7 CPU Operation When Odd Address is Set in SP Word access is also performed when the condition code register (CCR) is saved and restored by the interrupt exception-handling sequence and RTE instruction. When CCR is saved, the CCR value is saved in both the upper and lower bytes of the word data. When CCR is restored, it is loaded with the value at the even address. The value at the odd address is ignored. SP SP set to H'FEFF SP SP PCL PCL PCH R1L H'FEFD H'FEFC H'FEFF Stack accessed beyond SP BSR instruction Contents of PC are lost H MOV.B R1L, @–R7 Notation: PCH: PCL: R1L: SP: Upper byte of program counter Lower byte of program counter General register R1L Stack pointer 74 |
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