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MESC TOOL NEWS:
MESCT-AS79-990216D
Please take note of the following problem in using assembler AS79 for the 7900 series of microcomputers.
On Using abs79
- Versions Concerned
All the versions of AS79
- Problem
When assembler directive ".ORG" is described more than once in an absolute data section, the absolute address of the symbols defined in the second and later ".ORG" directives is not correctly generated (see Example 1).
[Example 1]
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| .section ram,data
| .org 100h
| sym1: .blkb 1
| sym2: .blkb 1
| .org 200h
| sym3: .blkb 1 ; Address not correctly generated
| sym4: .blkb 1
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-----------------------------------------------------------------------
- Workaround
Please define a data section for each ".ORG" directive (see Example 2).
[Example 2]
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| .section ram,data
| .org 100h
| sym1: .blkb 1
| sym2: .blkb 1
| .section ram1,data
| .org 200h
| sym3: .blkb 1
| sym4: .blkb 1
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-----------------------------------------------------------------------
On Describing Operands of MOVxx Instruction
- Versions Concerned
All the versions of AS79
- Problem
Even when an operand of the MOVxx instruction is described as spread over two lines, this description may not be assumed to be an error (see Example 3).
[Example 3]
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| MOVM 12H, #12H +
| 1
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-----------------------------------------------------------------------
- Workaround
When the description of one instruction is spread over two lines, be sure to use concatenate operator "\\" (see Example 4).
[Example 4]
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| MOVM 12H, #12H +\\
| 1
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Schedule of Fixing Problems
We plan to fix these problems in our next release.
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