8-1 BASIC 8086/8088 CONFIGURATIONS
In order to adapt to as many situations as possible both the
8086 and 8088 have been given two modes of operation, the
minimum mode and the maximum mode.
The minimum mode is used for a small system with a single
processor, a system in wich the 8086/8088 generates all the
necessary bus control signals directly (thereby minimizing
the required bus control logic). The maximum mode is for
medium-size to large systems, which often include two or
more processors.
| Operation |
/BHE |
A0 |
Data pins used |
| Write/read a word at an even address |
0 |
0 |
AD15-AD0 |
| Write/read a byte at an even address |
1 |
0 |
AD7-AD0 |
| Write/read a byte at an odd address |
0 |
1 |
AD15-AD8 |
| Write/read a word at an odd address |
0 |
1 |
AD15-AD8 (first bus cycle: puts the least significant
data byte on AD15-AD8) |
|
1 |
0 |
AD7-AD0 (Next bus cycle: puts the most significant
data byte on AD7-AD0) |
