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H83069RF Datasheet(PDF) 102 Page - Renesas Technology Corp

Part # H83069RF
Description  Renesas 16-Bit Single-Chip Microcomputer
PDF  1003 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H83069RF Datasheet(HTML) 102 Page - Renesas Technology Corp

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Rev. 5.0, 09/04, page 80 of 978
4.6
Notes on Stack Usage
When accessing word data or longword data, the H8/3069R 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.



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