What is control word for PPI 8255A microcontroller? I need the explanation...

  • Thread starter Thread starter Keith T
  • Start date Start date
K

Keith T

Guest
...for this?Anyone Pls help me..? Can anyone help me to explain what is thing? I need to do my presentation for this PPI 8255A microcontroller. But I'm still missing this part, >the CONTROL WORD for this PPI 8255A. I need to explain and clarify what is this thing. Please help me.. Thank you very-very much!
 
PPI is not micro-controller, it is a peripheral chip. It has 3 , 8bit ports.
Each pin assigned to port bit can act as input or output or can perform some special function together with other pins. To set-up behavior of each register , micro-controller has to write control word into the chip.
After reset, the chip starts in a mode where all bits are input bits.
Check 8255 documentation about what each word value means

Here is nice description
http://www.sharpmz.org/mz-700/8255ovview.htm
 
Back
Top