Operational Modes of 8255
There are two basic operational modes of 8255:
- Bit set/reset Mode (BSR Mode).
- Input/Output Mode (I/O Mode).
The two modes are selected on the basis of the value present at the D7 bit of the Control Word Register. When D7 = 1, 8255 operates in I/O mode and when D7 = 0, it operates in the BSR mode.
Read more about this topic: Intel 8255
Famous quotes containing the word modes:
“There are two modes of transport in Los Angeles: car and ambulance. Visitors who wish to remain inconspicuous are advised to choose the latter”
—Fran Lebowitz (b. 1951)