 |
|
|
RENESAS TOOL NEWS on July 1, 2004: RSO-M3T-NC30WA_1-040701D
A Note on Using C Compiler Package
M3T-NC30WA V.5.30 Release 1
--On Selecting Link Option "-R8C"--
|
|---|
Please take note of the following problem in using the M3T-NC30WA V.5.30
Release 1 C-compiler package for the M16C/60, M16C/30, M16C/Tiny, M16C/20,
M16C/10, and R8C/Tiny series of the M16C family MCUs:
- On selecting link option "-R8C"
- Versions Concerned
M3T-NC30WA V.5.30 Release 1
- Description
If link option "-R8C" is selected, the following problems occur in the
message telling the value set in the ROM code protect control address:
| (1) |
The message itself is incorrect.
For
Caution!! The Value of ID code protect control address is xxH
read
Caution!! The Value of ROM code protect control address is xxH
| NOTE: |
xxH denotes the value set in the ROM code protect control address |
|
| (2) |
The message may not tell the correct value. Note, however, that the
code is generated correctly though the value told is incorrect. |
- 2.1 Conditions
- This problem occurs if the following two conditions are satisfied:
| (1) |
Link option "-R8C" is selected. |
| (2) |
The value of the ROM code protect control address is set using
such an assembler directive commnad as ".LWORD". |
- 2.2 Example
Source file in assembly language:
-------------------------------------------------------------------
.section fvector,ROMDATA
.org 0FFFCH
RESET:
.lword start | 0FF000000H
.end
-------------------------------------------------------------------
Message displayed at invoking the ln30 linker:
-------------------------------------------------------------------
> ln30 -R8C sample
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Caution!! The Value of ID code protect control address is 0H
-------------------------------------------------------------------
The correct value to be displayed is not "0H" but "FFH".
- Workaround
When setting a value in the ROM code protect control address,
use assembler directive command ".PROTECT".
Example of Modification:
Source file in assembly language:
-------------------------------------------------------------------
.section fvector,ROMDATA
.org 0FFFCH
RESET:
.lword start
.protect 0FFH
.end
-------------------------------------------------------------------
- Schedule of Fixing the Problem
We plan to fix this problem in our next release of the product.
|
|
