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arpita said:hi!!
can anyone tell me how a 8051 microcontroller is expanded by connecting it to 8255 chip
Wrong. A Z80 PIO and the 8255 are distinctly different parts. The former was made by Zilog and the latter made by Intel. Although similar in function they are quite different in terms of programming.Nigel Goodwin said:If I remember correctly an 8255 was a Z80 PIO chip, it's a memory addressed device, so you need to provide data lines, address lines, R/W and enable lines. It's a micro-processor PIO, not a micro-controller one.
And the 8080 and the 8085....Nigel Goodwin said:OK, I'll rephrase - the 8255 was the PIO often used with the Z80
Personally though I've always considered it a really horrible device, with lots of silly limitations - the 6522 (6502 PIO) was a far more useful chip.
arpita said:thnks 4 d information...but i would like to know how 8255 and 8051 r connected....in respect to the project i m referring to...and also wat is the need 4 expanding the ports of 8051 as it has 4 8 bit i/o ports....so wat are they actuallly doing....do help!!!...the link of my project is
**broken link removed**