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H8SX1663 датащи(PDF) 143 Page - Renesas Technology Corp

номер детали H8SX1663
подробное описание детали  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX1663 датащи(HTML) 143 Page - Renesas Technology Corp

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Section 4 Exception Handling
Rev.1.00 Jun. 07, 2006 Page 91 of 1102
REJ09B0294-0100
4.9
Usage Note
When performing stack-manipulating access, this LSI assumes that the lowest address bit is 0. The
stack should always be accessed by a word transfer instruction or a 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)
Performing stack manipulation while SP is set to an odd value leads to an address error. Figure 4.4
shows an example of operation when the SP value is odd.
SP
CCR :
PC :
R1L :
SP :
Condition code register
Program counter
General register R1L
Stack pointer
CCR
SP
SP
R1L
H'FFFEFA
H'FFFEFB
H'FFFEFC
H'FFFEFD
H'FFFEFE
H'FFFEFF
PC
PC
TRAPA instruction executed
SP set to H'FFFEFF
Data saved above SP
MOV.B R1L, @-ER7 executed
Contents of CCR lost
Address
[Legend]
Note: This diagram illustrates an example in which the interrupt control mode is 0, in advanced mode.
(Address error occurred)
Figure 4.4 Operation when SP Value is Odd



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