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H8S2245 датащи(PDF) 144 Page - Renesas Technology Corp

номер детали H8S2245
подробное описание детали  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S2245 датащи(HTML) 144 Page - Renesas Technology Corp

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Section 4 Exception Handling
Rev.3.00 Mar. 26, 2007 Page 102 of 772
REJ09B0355-0300
4.6
Notes on Use of the Stack
When accessing word data or longword data, the H8S/2245 Group assumes that the lowest address
bit is 0. The stack should always be accessed by word transfer instruction or longword transfer
instruction, 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.
SP
Legend:
Note: This diagram illustrates an example in which the interrupt control mode is 0,
in advanced mode.
SP
SP
CCR
PC
R1L
PC
H'FFFEFA
H'FFFEFB
H'FFFEFC
H'FFFEFD
H'FFFEFF
MOV.B R1L, @–ER7
SP set to H'FFFEFF
TRAPA instruction executed
Data saved above SP
Contents of CCR lost
CCR: Condition code register
PC:
Program counter
R1L: General register R1L
SP:
Stack pointer
Figure 4.6 Operation when SP Value is Odd



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