R0E00008AKCE00EP9 Datasheet, PDF (16/23 Pages) Renesas Technology Corp – Microcomputer Development Environment System

E8a Emulator
Section 6 Notes on Using the E8a Emulator
18. Exceptional step execution
a) Software interrupt instruction
Step execution cannot be performed in the internal processing of instructions (undefined, overflow, BRK and
INT) which generate a software interrupt continuously in the program.
Example: INT instruction
NOP
NOP
INT#3
INT_3:
NOP
JMP MAIN
NOP
NOP
Passes through if the STEP execution is carried out.
Program should be stopped at this address.
NOP
REIT
b) INT instruction
To debug the user program with the INT instruction, set a PC break for the internal processing of the INT
instruction and execute the program with the GO command.
Example:
NOP
INT #3
NOP
JMP MAIN
INT_3:
NOP Break
NOP
REIT
Execute using GO command.
19. “Go to cursor” function
The “Go to cursor” function is actualized using an address match break. Therefore, when you execute the “Go to
cursor” command, all the address match breaks and hardware breaks you set become invalid, while all the PC
breaks remain valid.
20. Note on PC break point
When downloading a user program after modifying it, the set address of PC break may not be corrected normally
depending on the modification. Therefore, break points other than the set PC breaks may shift. After downloading
a user program, check the setting of PC breaks in the event point window and reset it.
21. Note on setting the break condition of the hardware breaks
When selecting the normal address bus (selecting “Address” radio button in the [Break condition] dialog box) as a
condition for the address bus, do not set the following addresses. Otherwise, an unauthorized break may occur.
- Address in the interrupt vector table
- Address set in the interrupt vector table (interrupt routine start address)
- Branch address of the branch instruction
Both fixed vector table and variable vector table are included with the interrupt vector table above.
REJ10J1646-0200 Rev.2.00 Jun. 17, 2009
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