Thanks Bob ----- Original Message ----- From: "Bob Ammerman" To: Sent: Tuesday, November 05, 2002 2:49 PM Subject: Re: [PIC]:Passing through zero > On a subtraction, the carry flag becomes a "not borrow" flag. In other > words, if the value "passes thru zero" then carry will be clear; otherwise > carry will be set. > > Bob Ammerman > RAm Systems > > ----- Original Message ----- > From: "Christopher Gill" > To: > Sent: Tuesday, November 05, 2002 8:54 AM > Subject: [PIC]:Passing through zero > > > I am trying to monitor whether a register value drops below zero when a > subtraction is carried out. Is this possible and how? > I understand how the carry bit is used to show a register going over > 0xFF, I thought the zero bit would have a similar effect in the other > direction > but this is only set when the value is exactly zero. > > can anyone help me > > thanks chris > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.