XR88C681_06 Datasheet, PDF (48/101 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR88C681
Figure 21 and Figure 22 present the 8086 CPU Mode, when operating in the “min” and “max” modes, respectively.
AD0 - AD7
INTR
-INTA
HOLD
AD8 - AD15
ALE
-DEN
DT/-R
M/-IO
Vcc
-RD
MN/-MX
8086 CPU
-WR
D
Q
C
74LS373
D
Q
C
74LS373
D0 - D7
A0 - A7
D8 - D15
A8 - A15
-IOR
-MEMR
-IOW
-MEMW
Figure 21. Schematic of the 8086 CPU Mode (Min Mode)
Rev. 2.11
48