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MAEC TOOL NEWS:
MAECT-M3T-PD32RSIM-030201D
A Note on Using Simulator Debugger
M3T-PD32RSIM V.2.00 Release 1
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Please take note of the following problem in using simulator debugger M3T-PD32RSIM for the M32R family MCUs:
- On results of comparisons by the FCMP or FCMPE instruction
- Version Concerned
M3T-PD32RSIM V.2.00 Release 1
- Description
Comparisons using the FCMP or FCMPE instruction may yield incorrect results.
- Conditions
- This problem occurs if the following three conditions are satisfied:
- (1) The values in the Rsrc1 and Rsrc2 registers are both normalized numbers.
- (2) The value in Rsrc1 is greater than the one in Rsrc2
- (3) The following expression holds:
1.0*2^(-128)+1.0*2^(-129) <= | Rsrc1 - Rsrc2 | < 1.0*2^(-127)
- 3.1 Example
- In the program below, the result of executing the FCMP instruction becomes "Comparison Impossible"; that is, the value indicating the comparison cannot be performed is stored in the Rdest register.
-------------------------------------------------------------
LD24 R1, #H'B00000
LD24 R2, #H'800000
FCMP R0, R1, R2
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- Workaround
This problem can be circumvented by using the problem-fixed simulator engine (sim32r.exe). So, please replace the simulator engine in your product with the above-mentioned one as follows:
| (1) |
Download the problem-fixed simulator engine (the sim32r.zip compressed file: 94.6KB). |
| (2) | Decompress the downloaded file to obtain the sim32r.exe file. |
| (3) |
With the decompressed sim32r.exe file, overwrite the old sim32r.exe file in the folder where the pd32rsim.exe file resides. |
| (4) | Confirm the version of the new simulator engine.
| (a) | Launch the M3T-PD32RSIM. |
| (b) | Right-click the SIM32R icon in the system tray and select the [Version...] menu. |
| (c) | The Version Information dialog box opens, on which the version of the problem-fixed simulator engine will be displayed. |
| (d) | Confirm the version is V.2.00.01. |
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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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