请问CPU的辅助寄存器XAR0-XAR7是怎么选择的?
例如DLOG4CHC.ASM中
_DLOG_4CH_init:
MOVL XAR5,#POS_TRIG_S1
MOVL *XAR4,XAR5 ; task=#POS_TRIG_S1
ADDB XAR4,#10 ; XAR4->trig_value
为啥是XAR4指向了trig_value,程序中哪里指定了选用XAR4的值作为指针?
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