注意:如果CPU已經(jīng)在運行模式時，使輸出失效的命令不會立即被執(zhí)行，到下一個周期收到同樣命令時才執(zhí)行。這樣，想要執(zhí)行SVC_REQ#43命令之前要使輸出失效至少一個掃描周期。當(dāng)首要單元的輸出被使能時，SVC_ _REQ#43不能在首要單元中被執(zhí)行。

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