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RENESAS TOOL NEWS on July 1, 2004: RSO-M3T-NC30WA_2-040701D
A Note on Using C Compiler Package
M3T-NC30WA V.5.30 Release 1
--On Setting the Reset Vector in the Start-Up Program--
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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/20, M16C/10,
and R8C/Tiny series MCUs:
- On setting the Reset vector in the start-up program
- Versions Concerned
M3T-NC30WA V.5.30 Release 1
- Description
The upper 8 bits of the Reset vector are set to 00.
Consequently, if any MCU belonging to the groups other than the R8C/10
and /11 groups is used in the R8C/Tiny series, the watchdog timer will
start operating after reset.
- 2.1 Conditions
- This problem occurs if the following two conditions are satisfied:
| (1) |
Any MCU belonging to the groups other than the R8C/10 and /11
groups is used in the R8C/Tiny series. |
| (2) |
Compile option "-R8C" is selected, or when a project is created
using the High-performance Embedded Workshop, "Renesas M16C Standard" is selected out of the
Toolchain list box, "5.3.0.0" is selected out of the Toolchain version
list box, and "R8C/Tiny" is selected out of the CPU Series list box. |
- Workaround
This problem can be circumvented in either of the following ways:
| (1) |
Download the problem-fixed sect30.inc(19KB) start-up file
and then replace the current file with it. |
| (2) |
Put a statement in the 736th line of the sect30.inc start-up file
as follows (in the 735th line, the Reset vector is specified):
Original:
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.org 0fffcH
RESET:
.lword start ; the 735th line
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Modified:
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.org 0fffcH
RESET:
.lword start
.protect 0ffH ; Put in the 736th line
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- Schedule of Fixing the Problem
We plan to fix this problem in our next release of the product.
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