US38024-BAG1 Renesas Electronics America, US38024-BAG1 Datasheet - Page 120
![no-image](/images/manufacturer_photos/0/5/560/renesas_electronics_america_sml.jpg)
US38024-BAG1
Manufacturer Part Number
US38024-BAG1
Description
DEV EVALUATION KIT H8/38024
Manufacturer
Renesas Electronics America
Series
H8®r
Type
MCUr
Datasheet
1.US38024-BAG1.pdf
(684 pages)
Specifications of US38024-BAG1
Contents
2G (Second-generation) Evaluation Board, HEW debugger support, Cable and CD-ROM
For Use With/related Products
H8/38024
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 120 of 684
- Download datasheet (5Mb)
Section 3 Exception Handling
3.4
3.4.1
When word data is accessed in the LSI, the least significant bit of the address is regarded as 0.
Access to the stack always takes place in word size, so the stack pointer (SP: R7) should never
indicate an odd address. Use PUSH Rn (MOV.W Rn, @–SP) or POP Rn (MOV.W @SP+, Rn) to
save or restore register values.
Setting an odd address in SP may cause a program to crash. An example is shown in figure 3.6.
When CCR contents are saved to the stack during interrupt exception handling or restored when
RTE is executed, this also takes place in word size. Both the upper and lower bytes of word data
are saved to the stack; on return, the even address contents are restored to CCR while the odd
address contents are ignored.
Rev. 8.00 Mar. 09, 2010 Page 98 of 658
REJ09B0042-0800
SP
→
SP set to H'FEFF
[Legend]
PC
PC
R1L:
SP:
Notes on Stack Area Use
Application Notes
H
L
:
:
Upper byte of program counter
Lower byte of program counter
General register R1L
Stack pointer
Figure 3.6 Operation when Odd Address is Set in SP
BSR instruction
SP
Stack accessed beyond SP
→
PC
PC
H
L
MOV. B R1L, @−R7
SP
→
Contents of PC are lost
PC
R1L
L
H
H'FEFC
H'FEFD
H'FEFF
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