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MESC TOOL NEWS:
MESCT-PD45-000201D
Please take note of the following problem in using emulator debugger PD45 for the 4500 series of microcomputers:
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Versions Concerned
PD45 V.1.10 Release 1 -- V.1.30 Release 1
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Problem
Assembler ASM45, included in the PD45 product package, comes with a function of optimizing branch instructions, which is capable of developing optimize instruction "BRN" to instruction "B" (jump to an address within the page) or "BL" (jump to an address out of the page). However, because an instruction that should be "BL" becomes "B" depending on how the source program is described, the following error may occur:
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Error 17: Relative jump is out of range "xxxxx"
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Condition
If the label designated as the operand of an "BRN" instruction is forward referencing, this problem may occur. On the other hand, no problem occurs if the above label is backward referencing or immediate addressing, as well as if the "B" or "BL" instruction is directly described.
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Example
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.org $1FB
BRN L1 <- Optimized as an "B" instruction to result in
an error
BRN L2
BRN $FFF Page 3
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L1: Page 4
NOP
L2:
NOP
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Workaround
Change "BRN" instructions causing errors to "BL" instructions.
[Modified] BL L1
[Original] BRN L1
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Schedule of Fixing Problem
The fixed version is due to be released on our tool homepage; the time of release will be announced in this tool news.
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