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standby instruction
http://forum.andestech.com/viewtopic.php?f=14&t=650
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Author:  cindy [ Tue Dec 18, 2012 3:03 pm ]
Post subject:  standby instruction

standby指令中文說明
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standby.gif
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subtype 0-->CPU從standby mode回normal mode的條件是interrupt(int_req or NMI)來叫醒的,意思就是有interrupt來CPU就會回normal mode

subtype 1-->CPU從standby mode回normal mode的條件是interrupt(int_req or NMI)跟PMU(WAKEUP_OK)成立才叫醒,意是就是interrupt跟PMU 2個條件都成立,CPU就會回normal mode

subtype 2-->CPU從standby mode回normal mode的條件是PMW(WAKEUP_OK)成立來叫醒,意是就是PMU條件成立,CPU就會回normal mode

ps. PUM(power management unit)

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subtype 0可以由interrupt叫醒,這是最簡單的一種省電模式,也不用另外的PMU訊號。
但是記得...standby這根訊號不會拉到high。standby訊號是給PMU用的。

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