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CHAPTER
(a) Reset vector
A reset vector includes the jump instruction for the debug monitor program.
[How to secure areas]
It is not necessary to secure this area intentionally. When downloading a program, however, the debugger
rewrites the reset vector in accordance with the following cases. If the rewritten pattern does not match the
following cases, the debugger generates an error (F0c34 when using the ID850QB).
•
When two nop instructions are placed in succession from address 0
Before writing
0x0 nop
0x2 nop
0x4 xxxx
•
When two 0xFFFF are successively placed from address 0 (already erased device)
Before writing
0x0 0xFFFF
0x2 0xFFFF
0x4 xxxx
•
The jr instruction is placed at address 0 (when using NEC Electronics compiler CA850)
Before writing
0x0 jr disp22
•
mov32 and jmp are placed in succession from address 0 (when using IAR compiler ICCV850)
Before writing
0x0 mov imm32,reg1
0x6 jmp [reg1]
•
The jump instruction for the debug monitor program is placed at address 0
Before writing
Jumps to debug monitor program at 0x0
3
HOW TO USE MINICUBE2 WITH V850 MICROCONTROLLER
After writing
→
Jumps to debug monitor program at 0x0
0x4
xxxx
After writing
→
Jumps to debug monitor program at 0x0
0x4
xxxx
After writing
→
Jumps to debug monitor program at 0x0
0x4 jr disp22 - 4
After writing
→
Jumps to debug monitor program at 0x0
0x4
mov imm32,reg1
0xa jmp [reg1]
→
User's Manual
After writing
No change
U18371EJ5V0UM
33
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