问题已经找到了！
应该写成 __asm(" BRA #20266");
即在BRA指令前至少要有一个空格！
在MSP430汇编指令的手册中有如下规定：
“A mnemonic cannot begin in column 1 or it will be interpreted as a label. Mnemonic opcodes and assembler directive names without the . prefix are valid label names. Remember to always use whitespace before the mnemonic, or the assembler will think the identifier is a new label definition.
”
再次感谢大家的热心回复！
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应该写成 __asm(" BRA #20266");
即在BRA指令前至少要有一个空格！
在MSP430汇编指令的手册中有如下规定：
“A mnemonic cannot begin in column 1 or it will be interpreted as a label. Mnemonic opcodes and assembler directive names without the . prefix are valid label names. Remember to always use whitespace before the mnemonic, or the assembler will think the identifier is a new label definition.
”
再次感谢大家的热心回复！
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