HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 169
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HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
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4.8
When accessing word data or longword data, this LSI 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:
Use the following instructions to restore registers:
Setting SP to an odd value may lead to a malfunction. Figure 4.4 shows an example of operation
when the SP value is odd.
SP
PUSH.W
PUSH.L
POP.W
POP.L
Note: This diagram illustrates an example in which the interrupt control mode is 0, in advanced mode.
Legend:
Usage Note
CCR :
R1L :
PC :
SP :
SP set to H'FFFEFF
Condition code register
Program counter
General register R1L
Stack pointer
Rn
ERn
Rn
ERn
TRAP instruction executed
Figure 4.4 Operation when SP Value Is Odd
(or MOV.W Rn, @-SP)
(or MOV.L ERn, @-SP)
(or MOV.W @SP+, Rn)
(or MOV.L @SP+, ERn)
SP
Data saved above SP
CCR
PC
MOV.B R1L, @-ER7
Rev.7.00 Mar. 18, 2009 page 101 of 1136
SP
Contents of CCR lost
Section 4 Exception Handling
R1L
PC
REJ09B0109-0700
H'FFFEFA
H'FFFEFB
H'FFFEFC
H'FFFEFD
H'FFFEFE
H'FFFEFF
Address
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