CPU40
CPU Module
Function
PC is corrupted when executing jump/conditional jump instruction that is followed by
instruction with PC as destination register or a data section
Description
If the value at the memory location immediately following a jump/conditional jump
instruction is 0X40h or 0X50h (where X = don't care), which could either be an
instruction opcode (for instructions like RRCM, RRAM, RLAM, RRUM) with PC as
destination register or a data section (const data in flash memory or data variable in
RAM), then the PC value is auto-incremented by 2 after the jump instruction is executed;
therefore, branching to a wrong address location in code and leading to wrong program
execution.
For example, a conditional jump instruction followed by data section (0140h).
@0x8012 Loop DEC.W R6
@0x8014 DEC.W R7
@0x8016 JNZ Loop
@0x8018 Value1 DW 0140h
Workaround In assembly, insert a NOP between the jump/conditional jump instruction and program
code with instruction that contains PC as destination register or the data section.
能不能用中文帮助解释一下怎么回事？省时间不解释也行，请问是不是给了汇编中的处理方法，那么C编程的时候会遇到这种情况么？
