Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!blake!ogccse!littlei!uunet!pcrat!rick
From: rick@pcrat.UUCP (Rick Richardson)
Newsgroups: comp.unix.microport
Subject: Re: 16550A in uport 3.0e ('386)
Message-ID: <674@pcrat.UUCP>
Date: 15 Feb 89 03:29:15 GMT
References: <5111@b-tech.ann-arbor.mi.us> <379@twwells.uucp> <2226@van-bc.UUCP>
Reply-To: rick@pcrat.UUCP (Rick Richardson)
Organization: PC Research, Inc., Tinton Falls, NJ
Lines: 16

In article <2226@van-bc.UUCP> sl@van-bc.UUCP (pri=-10 Stuart Lynne) writes:
>
>This is a function of the PIC, it is level triggerred; and if you never
>bring the level down it cannot see someone else bringing it high. 

Small correction, it is being used in *edge triggered* triggered
mode; and if you never bring the level down it cannot see someone else
bringing it high.  If the PIC had been programmed level trig, then
not servicing the interrupt would be real obvious - you'd spend all
day going in and out of the ISR.

-- 
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