Depends. If you take a look here: http://www.geocities.com/vsurducan/electro/8255/8255.htm you'll see it's read-not. As I remember read-not and write-not signals are in opposite phase but that depends hardly on your system timings. greetings, Vasile On 5/29/07, Rikard Bosnjakovic wrote: > On 5/30/07, Rich wrote: > > Hi all. If I use a 74LS245 bidirectional bus transceiver is the write-not > signal the one to the direction control pin? Or can either the write-not or > read-not be used to control the direction? > > I'm not sure what you mean by "write-not" and "read-not". > > The 74LS245 has got two pins that control the flow, the DIR (pin 1) > and G' (pin 19). The DIR selects if the bus A should move to B, or B > to A. The G' effectively turns the whole bus ON or OFF. > > > -- > - Rikard - http://bos.hack.org/cv/ > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist