Section 4 Exception Handling
Rev. 1.00 Mar. 12, 2008 Page 76 of 1178
REJ09B0403-0100
4.7 Usage
Note
When accessing word data or longword data, this LSI assumes that the lowest address bit is 0. The
stack should always be accessed in words or longwords, 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 4.3 shows an example of what
happens when the SP value is odd.
Condition code register
Program counter
General register R1L
Stack pointer
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.
H'FFFEFA
H'FFFEFB
H'FFFEFC
H'FFFEFD
H'FFFEFF
SP
CCR
SP
SP
R1L
PC
PC
CCR:
PC:
R1L:
SP:
Figure 4.3 Operation When SP Value is Odd
Содержание H8S Family
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Страница 588: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 1 00 Mar 12 2008 Page 540 of 1178 REJ09B0403 0100...
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